The heat in my 95 wrangler was blowing freezing cold air and would take 20 minutes to get a little warm and the temperature gauge was all over the place so i replaced the thermostat, i even put in a brand new radiator and all new hose and antifreeze before that but now the heat just blows luke warm its not like it was when i first bought the jeep. Does anyone know what this could be? could it be airbubbles and if so how do i take care of it?
My Build Thread. with plenty of pics
1179 příspěvků · Připojeno 2009
vacuum valve to the heater core / heater core clogged / vacuum hose
Daily Driver 2010 Ford Fusion
Weekend Toy: 2008 Rubicon.
Expensive Toy: 1983 Cadillac Coupe DeVille
It’s not the size of the dog in the fight, but the size of the fight in the dog!
513 příspěvků · Připojeno 2009
Could be a clogged heater core. When the engine is at full temp, feel both heater hoses.. If one is hot and the other cold, your core is clogged. You can try doing a reverse flush on the core. Has about a 75 % success rate when i do it for customers. Now if both hoses are hot, i would look into the inner doors on your heater box. Good luck..
91 YJ, SBC V8, 5 rychlostí, 8.8, 4″ pružina, SOA, 35″ MT/R :tanec. Bohužel jsem prodal svůj Jeep.
yjkid95 Discussion starter
1611 příspěvků · Připojeno 2010
Ok thanks for the tips
My Build Thread. with plenty of pics
235 příspěvků · Připojeno 2009
You could have air bubbles in the system if the guage is going up and down. It also could be a defective radiator cap not holding pressure. Did you change this with the new radiator? The coolant is always flowing through the heater core. Trying back flushing like uplifted said and make sure the heater control cables are functioning properly. If it isn’t opening the door correctly you may not have full heat or it could be drawing in outside air instead.
1020 příspěvků · Připojeno 2009
And just a heads up . If it is the heater core you DO NOT have to remove the dash.
Just 4 bolts from the engine bay side of the firewall .
A lot of jeepers have made the mistake of thinking the dash has to be removed.
5 příspěvků · Připojeno 2023
That would save a boatload of time if I ever have to do it again. Would love to see a diagram of the four bolts, and how to access them.
2192 příspěvků · Připojeno 2008
is the mixer door closing?
ŘEŠTE KAŽDOU STRESUJÍCÍ SITUACI JAKO PES.
POKUD TO NEMŮŽETE JÍST NEBO S NÍM HRÁT,
STAČÍ SE NA TO ČUROVAT A ODEJÍT.
2 příspěvků · Připojeno 2010
I also have the same problem. Please let me know how you fixed it. I flushed the core, new cap, new radiator, . nothing. Thanks
361 příspěvků · Připojeno 2009
Just fixed mine this morning since it FINALLY warmed up to the mid 20’s.
Old thermostat was stuck open, guess it’s been that way for a couple weeks, since the LAST time it got to be a balmy 34 degrees. Now the dash gauge shows a cozy 200 to 210 degrees and the heat will blast you out.
MILOST
1989 Wrangler «Islander» 4.2 6cyl 5 speed
12 příspěvků · Připojeno 2022
Here is a page from the FSM showing the heat only section of the HVAC. If you do not have A/C this is the whole system. Two of the bolts are labeled and they are easy to pick out on the firewall. I had the battery and battery tray out of my ’95 and they are right there! You should download the FSM and the parts catalog, they are VERY useful! Jay
5 příspěvků · Připojeno 2023
I’ve got a 2013 JK with a/c so I don’t know if this would apply but I really appreciate it
302 příspěvků · Připojeno 2022
an low cost IR temp gun helps on this.
we use these also for finding electrical issues like bad switches.
or other things over heating or under heating.
you can use this on the block to see the temp difference.
as well on the rad hoses upper and lower to make sure you have cooling.
they are also handy for doing the air conditioning if you have that option.
just make sure to test or replace the green coolant every 4-5 years.
or the better coolant every 10 years.
if the coolant goes off it can damage the seals and or plate out the insides of the engine to the coolers etc.
as well as it is a fail on the thermal under pressure specification. and can lead to boil over when super hot.
i always do a new thermostat and coolant at 5 years old on the green coolant cars and trucks.
at the same time i do the belts.
and mark in the glove box service book when it was done as well as under the hood for the last service dates and miles.
The Jeep heater may be blowing cold air due to a malfunctioning thermostat or a low coolant level. A cold blast of air from the Jeep’s heater can put a damper on your driving experience, especially during the winter months.
If you’re wondering why your Jeep heater is blowing cold air, there are a few possible reasons to consider. One common culprit is a faulty thermostat, which regulates the flow of hot coolant through the heater core. When the thermostat malfunctions, it may not open properly or at all, causing cold air to be circulated instead of warm air.
Another potential cause could be a low coolant level in the radiator, preventing sufficient heat from reaching the heater core. We will explore these and other possible causes of why your Jeep heater is blowing cold air.
Common Causes Of Cold Air From Jeep Heater
Are you experiencing the frustrating issue of cold air blowing from your Jeep’s heater? Fear not, as we explore the common causes of this predicament and provide potential solutions. It’s essential to understand the underlying reasons behind your Jeep’s heater blowing cold air to address the problem effectively.
Vadný termostat
A faulty thermostat can be a significant factor in your Jeep’s heater blowing cold air. The thermostat is responsible for regulating the temperature of the coolant flowing through the engine. When it fails to function correctly, it can cause the engine to run cooler than optimal, resulting in cold air being blown into the cabin.
To determine if your thermostat is faulty, you can check if the engine temperature gauge remains low even after the vehicle has warmed up. Replacing the thermostat can resolve this issue, ensuring the engine operates at the right temperature and heat is efficiently distributed throughout the Jeep.
Nízká hladina chladicí kapaliny
Another common cause of cold air from the Jeep’s heater is a low coolant level. Coolant, also known as antifreeze, plays a vital role in maintaining the engine’s temperature. Insufficient coolant can lead to ineffective heat transfer, causing the heater to blow cold air. To check the coolant level, you can refer to your Jeep’s owner manual for the precise location of the coolant reservoir.
If the coolant level is low, adding the appropriate coolant mixture should resolve the issue. However, it is essential to ensure there are no leaks or other underlying problems contributing to the coolant loss, as these issues may require further inspection and repair.
Blokované topné jádro
A blocked heater core can also result in your Jeep’s heater blowing cold air. The heater core is a small radiator-like component responsible for warming the air that enters the cabin. Over time, mineral deposits and debris can accumulate within the heater core, obstructing the proper flow of coolant and reducing its heating capacity.
To address a blocked heater core, you may try flushing it with a specialized cleaning solution or seeking professional assistance. Clearing the blockage will restore the proper functioning of the heater core, ensuring warm air flows into the cabin of your Jeep.
Checking The Thermostat
When it comes to staying cozy during the winter months, having a functioning heater in your Jeep is essential. However, if you find that your Jeep heater is blowing cold air instead of warm air, it can be quite frustrating. One of the first things you should check when facing this issue is the thermostat. The thermostat plays a crucial role in regulating the engine’s temperature and directing the flow of warm air into the cabin.
Signs Of A Faulty Thermostat
If your Jeep’s heater is blowing cold air, there might be an issue with the thermostat. Here are some signs that indicate a faulty thermostat:
- The engine takes longer to warm up than usual
- The temperature gauge fluctuates frequently
- The heater blows hot air intermittently
- There is a noticeable decrease in fuel efficiency
If you notice any of these signs, it’s crucial to address the issue promptly to prevent further damage to your vehicle and to ensure your comfort during those chilly drives.
Steps To Test And Replace The Thermostat
To determine whether the thermostat is indeed the culprit behind your Jeep’s cold air dilemma, you can perform the following steps:
- Start by allowing your engine to cool down completely.
- Locate the thermostat housing, which is typically positioned near the engine’s upper radiator hose.
- Remove the housing to access the thermostat.
- Inspect the thermostat for any signs of damage, such as cracks or corrosion.
- Test the thermostat by placing it in a pot of boiling water. If it doesn’t open fully, it’s likely malfunctioning and needs to be replaced.
- If the thermostat fails the test, remove it and replace it with a new one, ensuring it is properly installed.
Keep in mind that if you’re not confident in performing these steps yourself, it’s always best to consult a professional mechanic to avoid any further complications.
Importance Of Proper Thermostat Functioning
A properly functioning thermostat is vital for optimal engine performance and overall comfort while driving your Jeep. Here’s why maintaining a well-functioning thermostat is important:
- Regulates engine temperature: The thermostat helps regulate the engine’s temperature, preventing it from overheating or running too cold. This ensures the engine operates efficiently and prevents potential damage.
- Ensures warm cabin air: A functional thermostat allows the engine to reach its optimal temperature, allowing warm air to flow into the cabin and provide comfort to you and your passengers during those frosty winter drives.
- Promotes fuel efficiency: When the engine reaches its ideal operating temperature, it operates efficiently, leading to better fuel economy. On the other hand, a malfunctioning thermostat can cause increased fuel consumption.
With a properly functioning thermostat, you can enjoy a warm and comfortable ride during the winter months while also ensuring the longevity and efficiency of your Jeep’s engine.
Inspecting The Coolant Level
Checking the coolant level could be the reason why your Jeep heater is blowing cold air. Ensure your coolant is at the appropriate level to prevent any heating issues.
One of the primary reasons why your Jeep heater may be blowing cold air is due to a low coolant level. The coolant, or antifreeze, is responsible for regulating the temperature in your vehicle’s engine and also plays a crucial role in heating the cabin. By inspecting and maintaining the coolant level, you can ensure that your Jeep’s heater functions properly even during the coldest months.
Importance Of Coolant For The Heater
The coolant in your Jeep is not only important for preventing overheating and ensuring the engine’s optimal performance but also for generating warm air in the cabin.
When the heater is turned on, hot coolant flows through the heater core, which then warms up the air that is blown into the cabin. If the coolant level is low or depleted, the heater core may not receive enough hot coolant, resulting in the circulation of cold air instead.
Steps To Check And Refill Coolant
To determine whether low coolant level is causing your Jeep’s heater to blow cold air, follow these steps:
- Park your Jeep on a level surface and allow the engine to cool down completely.
- Locate the coolant reservoir under the hood. Refer to your vehicle’s owner’s manual if needed.
- Carefully remove the cap of the coolant reservoir. If the engine is hot, use a towel or glove to protect your hand from any steam or pressure buildup.
- Inspect the coolant level visually. The level should be between the minimum and maximum markings on the reservoir. If it is below the minimum mark, proceed to the next step to refill it.
- Add the appropriate coolant according to your Jeep’s specifications. Ensure that you use the recommended type of coolant and mix it with distilled water if required. Refer to your vehicle’s owner’s manual for the correct coolant type and mixture ratio.
- Screw the cap back onto the coolant reservoir and make sure it is tightly secured.
Signs Of Coolant Leak
In some cases, the coolant level may drop due to a leak in the cooling system. Keep an eye out for the following signs of a coolant leak:
- Puddles of coolant beneath your vehicle after it has been parked for a while.
- Přehřívající se motor.
- The smell of coolant inside the cabin.
- Visible coolant stains or residue on engine components or hoses.
Clearing The Heater Core
If you’ve ever found yourself freezing in your Jeep while the heater is running, you know just how frustrating it can be. One possible reason for this issue is a blocked heater core. The heater core is a vital component of your Jeep’s heating system that acts as a mini radiator. It heats up the air that blows into the cabin, ensuring you stay warm and cozy even in the coldest weather.
Role Of The Heater Core
The heater core is a small heat exchanger located inside your Jeep’s dashboard. It is connected to the engine’s cooling system and functions by transferring heat from the engine coolant to the air that circulates in the cabin. This transfer of heat warms up the air blown through the vents, providing you with a comfortable driving experience even in frigid conditions.
Signs Of A Blocked Heater Core
It’s important to be aware of the signs that indicate a blockage in your Jeep’s heater core. If you experience any of the following issues, there’s a high likelihood that your heater core is clogged:
- Continuous blowing of cold air even when the heater is on.
- Poor heating performance, with the air not reaching the desired temperature.
- An unusual sweet smell, which can indicate coolant leakage caused by a damaged heater core.
- Visible coolant leaks inside your vehicle or beneath the dashboard.
Steps To Flush And Clean The Heater Core
Luckily, flushing and cleaning your Jeep’s heater core can often resolve these issues without the need for extensive repairs. Follow these steps to clear a clogged heater core:
- Start by parking your Jeep in a safe location and ensuring the engine is cool. Safety should always be a priority.
- Locate the heater core, usually located behind the dashboard on the passenger side. Refer to your Jeep’s manual or guides for specific instructions on accessing it.
- Disconnect the hoses connected to the heater core and use a bucket or container to catch any coolant that may leak out.
- Using a garden hose, gently flush the heater core in both directions. This helps dislodge any debris or sediment that may be causing the blockage. Be mindful of the water pressure to avoid damaging the core.
- Once the water runs clear, reconnect the hoses and ensure they are tightly secured. Double-check for any leaks.
- Refill the cooling system with fresh coolant, following manufacturer guidelines.
- Start your Jeep and let it run for a few minutes, ensuring the heater is set to its highest temperature. This allows the coolant to circulate through the newly cleaned heater core.
- Check for any leaks or abnormal behavior. If everything seems fine, you can now enjoy the warm and toasty cabin of your Jeep.
Hledám odbornou pomoc
If your Jeep heater is blowing cold air, it can be a frustrating and uncomfortable experience, especially during the colder months. While there are a few possible reasons for this issue, seeking professional assistance is often the best course of action to accurately diagnose and resolve the problem.
1. Consult A Mechanic
When faced with a Jeep heater blowing cold air, it is crucial to determine when it is time to consult a mechanic. While some heating issues may be minor and easy to fix, others can be more complex and require professional expertise. Here are a few indicators that it is time to seek professional assistance:
- Continuous blowing of cold air despite adjusting the temperature settings
- Inconsistent heating performance, with the heater blowing warm air intermittently
- Unusual noises or smells coming from the heater system
- Noticeable leaks or coolant odor inside the vehicle
- Fluctuating engine temperature gauge
In such cases, it is essential to have a qualified mechanic inspect and diagnose the issue to prevent further damage or potential safety hazards.
2. Pravidelná údržba
Regular maintenance plays a vital role in ensuring the optimal performance of your Jeep’s heating system. Over time, components may wear out or become clogged with debris, resulting in reduced efficiency and the blowing of cold air. By adhering to a maintenance schedule, you can safeguard against such issues and potentially avoid costly repairs down the line.
Regular maintenance tasks for your Jeep’s heating system include:
| Úkol údržby | Frekvence |
|---|---|
| Checking coolant levels and topping up if necessary | Every 6 months or as recommended in the owner’s manual |
| Inspecting hoses and fittings for leaks or damage | Every 12 months or as recommended in the owner’s manual |
| Flushing the heater core to remove debris and sediment | Every 2-3 years or as recommended in the owner’s manual |
| Replacing the thermostat if malfunctioning | As needed or as recommended in the owner’s manual |
By staying proactive with maintenance, you can ensure that your Jeep’s heater functions optimally, providing you with cozy warmth during your drives.
3. Cost-effective Solutions And Preventions
While consulting a mechanic and maintaining your Jeep’s heater system are essential steps, there are also cost-effective solutions and preventions you can employ to avoid the recurrence of cold air blowing issues. Here are a few:
- Regularly inspect and replace the cabin air filter to prevent clogs and maintain proper air circulation.
- Check the heater control valve for any signs of failure or clogging and replace if necessary.
- Ensure proper insulation and sealing around the heating system components to prevent heat loss.
- Regularly monitor and address any engine overheating issues promptly to prevent damage to the heater system.
- Follow the manufacturer’s recommendations regarding the type of coolant and its proper mixture.
Balil
To sum up, troubleshooting a Jeep heater blowing cold air can be a frustrating experience. By following the steps outlined in this blog post, you can identify and fix the issue efficiently. Whether it’s a faulty thermostat, a malfunctioning blend door actuator, or low coolant levels, addressing the underlying problem is crucial for restoring warmth and comfort to your Jeep.
Remember to seek professional assistance or consult your vehicle’s manual if needed. Stay warm and drive safely!
Nejčastější dotazy
Why Is My Car Vent Blowing Cold Air When The Heat Is On?
When the heat is on, cold air may come out of your car vent due to a malfunctioning blend door, low coolant levels, a faulty thermostat, or a problem with the heater core. It’s best to have a professional mechanic diagnose and fix the issue.
Why Is My Heater Blowing Cold Air When Heat Is On?
Your heater may blow cold air when the heat is on due to various reasons. It could be a malfunctioning thermostat, a blocked air filter, a faulty heating element, or low refrigerant levels. It’s best to consult a professional HVAC technician to diagnose and fix the issue.
Why Is My Heat Not Working In My Jeep?
The heat in your Jeep may not be working due to several potential issues. Common causes include a faulty thermostat, low coolant level, or a malfunctioning heater core. It is best to have a professional diagnose and repair the problem for optimal results.
Why Is Cold Air Coming Through The Heater Vents?
Cold air may come through the heater vents due to several reasons, such as a malfunctioning thermostat, low coolant levels, or a faulty blend door. Get your vehicle’s heating system inspected by a professional to identify and fix the issue for optimal warmth.
