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EvanD
Připojeno 28. června 2014 Vlákna 13 zpráv 380
I’ve just spent a good amount of time with the search function and come up relatively empty regarding my issue.
My heating system blows cold not for the first 10 seconds or so. If I turn it off, drive around, and turn it on it blows warm for the first 10 seconds. After that though it goes straight to cold.
Auto heating systems aren’t something I have any experience with so any input on where to start would be extremely appreciated.
Edit- The truck runs at healthy temperature in all conditions and the AC/vents appear to work just fine. It also worked when I first got the vehicle and randomly stopped two winters ago. My situation was such that I didn’t need it so I haven’t tried to deal with it until now.
Another edit- Rear heat doesn’t work at all. Not even for the 10ish seconds.
Poslední úprava: 19. října 2016
Bílý pruh
Připojen 6. ledna 2012 k vláknům 330 zpráv 10,245
Check your coolant level, it is likely low and you likely have a coolant leak somewhere.
Kowalski
Připojen 21. listopadu 2011 Vlákna 13 Zprávy 263
your heater core is probably plugged
edit, just realized both aren’t working. The guy above me probably got it right.
EvanD
Připojeno 28. června 2014 Vlákna 13 zpráv 380
I’ll check that out tomorrow and report back. Thanks guys!
EvanD
Připojeno 28. června 2014 Vlákna 13 zpráv 380
I take it back. Curiosity got the better of me so out came the headlamp.
Coolant level is not low. In fact, it’s a decent amount over (about halfway from the full line and the top of the tank). I can’t imagine that’s causing the issue?
Edit- I also haven’t been filling it (a shop would have been the last to do it, and it wasn’t recently) so a leak seems unlikely.
Nějaké další myšlenky?
Rivman1243
Stříbrná hvězda
Joined Feb 27, 2016 Threads 15 Messages 756 Location Helena Montana
Is the heater valve actually opening?
97 FZJ80 259K on the clock- DD- OME 850 & 860 springs shocks and steering damper- Unlocked- ARB Front bumper with a Warn VR8000- PIAA Driving lights- PFRAN 7W reverse LEDs- LED interior lights- Hazard switch repurposed to a CDL switch- Pin 7 mod- Auto up mod- 285/75-R16 Toyo Open Country A/T
EvanD
Připojeno 28. června 2014 Vlákna 13 zpráv 380
Unsure on the valve as I haven’t personally checked. I kinda figured the fact that it blows hot for 10 seconds meant that it was but in light of more searching after I posted this thread I’m going to check.
I still can’t find any very similar account of my situation (where it blows hot and just stops) but it seemed worth checking.
gnarlytoes
Joined Nov 11, 2010 Threads 45 Messages 375 Location Beech Bluff, Tennessee
Probably heat control valve is not opening all the way or blockage in line or core. It is open just enough to let a little flow through. When you turn the heater on, it quickly cools the heater core off and not enough flow to keep it warm.
Bigsky80
Joined Aug 20, 2011 Threads 40 Messages 459 Location Great Falls, MT
I had a similar problem that ended up being a missing thermostat o-ring.
Na zdraví,
Skot
1991 FJ80 3fe, OME «stock height» springs, Cruisinoffroad bumper (SOLD to Keenan)
1999 LX 470 220K miles, TJM T13, OPOR sliders
Wayne
Bought by His blood, kept by His power
Joined Oct 12, 2003 Threads 111 Messages 993 Location Middleburg, Florida
I’m not sure what exactly is causing you to have heat for ten seconds and then cold. The cooling/heating system can get air trapped in it that needs to be «burped» out. Park on an incline (nose high), take the radiator cap off and run the engine a normal operating temp with the heater turned on for ten to fifteen minutes. This will allow any air trapped in the coolant/heating system to escape. This procedure has restored heat to a few Cruisers.
’96 FZJ80, 270,800, no lockers, BFG AT KO2 285, 75R 16’s, CDL switch and #7 pin mod
1stSgt USMC (Ret) 1963-83
For there is one God, and one mediator between God and men, the man Christ Jesus. I Timothy 2:5
baselfish
Joined Jan 15, 2011 Threads 14 Messages 333 Location san jose, ca
are you indeed familiar with the HCV . tis dead center at the back of the engine bay
the trouble it if it is an original part with some 200K miles — it is highly susceptible to completely falling apart —
then (lest you have enough 3/8 hose to do a emergcy bypass) you are SOL till you replace it.
general rule of thumb (lest you are intent on replacing it and have the new part in hand) is to NOT money with it —
again especially if it is old.
if you do want to test / inspect it — gingerly loosen right side clamp (you might get some coolant spillage but it is safely at the apex of the cooling system) and manipulate the HVAC slider in the dash from cold to hot — it is basically a mechanical linkage —
at cold the HCV valve is closed and at hot is should be fully open.
BTW Don’t crank over you engine — lest you want to spew coolant all over.
hopefully it is you HCV — and from there it is an easy replacement (I got an autozone part for $40.00)
if it does turn out to be your HCV — indeed follow the aforementioned post on «burping» the system — as you have open up the system
vysílat.
LandCruisinMy93
Joined Apr 4, 2013 Threads 40 Messages 2,368 Location Springfield, OR
I’d suggest burping the system which can be down on flat ground also with the use of a funnel, some electric tape and some coolant. Get one of the Walmart funnels that has the screw on rippled flew hoses and cut the neck out at the bottom of the fist set of threads. Place it down into the radiator neck, if it’s a tight fit like some are leave it otherwise wrap a few wraps of electrical tape around it until it’s a tight fit, run your engine until warm and fill the funnel halfway with coolant. Open your heater valve. Proceed to squeeze all the upper heater hoses repeatedly watching for escaping air and dropping coolant level. When no more air escapes idle your engine up to about 1500 Rpm and hold it there while watching for escaping air and coolant drop. When no more air has come out for about 5 or so minutes s*** the cruiser off, pull the funnel up slightly to allow excess to drain through the catch tank orifice. Reinstall radiator cap and check that your heat is working again. If not the likely culprits are Heater control valve is internally broken ,thermostat not working properly and the bypass is carrying coolant, the heater core is plugged and needs a back flush.
With the coming of the cold weather, it is certain that you’d use your car heater to warm up your car from inside. But, what if your car heater blows cold air or stops working altogether? In such a case, you can ask yourself why is my car heater blowing cold air.
A faulty car heater can irritate you when you find it out on a bitterly cold winter day. An unreliable car heater can make the cold winter days almost intolerable. A car heater can fail in varied ways owing to a few problems. Just like a home heater, an automotive car heater has several parts in it that work together in order to blow out hot air.
Why is My Car Heater Blowing Cold Air?
What is a Car Heater?
An automotive heater core is a device similar to a compact radiator that is made up of aluminum or brass tubing. It is useful in heating the interiors of a vehicle through the tubing that transports the hot coolant, in addition to the fans that spread the heat emitted by the coolant.
The hot coolant is passed from the engine of the vehicle to the core’s winding tube, which acts as a medium between the coolant and the cabin air.
The core tubes are equipped with fins, which augment the surface for transferring the heat to air that is forced past them via a fan and thus warms up the car’s interiors. A heater core looks after the heating and defrosting actions of a vehicle. It is generally located directly at the back side of the car’s dashboard.
Jak funguje topení do auta?
Image source: autorepairinstructions.com
A car heater makes use of the heat in the coolant, which flows around the engine of the car. This is why the car heater only blows hot air when you run your car for a few minutes since then it will warm the coolant inside its engine.
The water circulation is regulated by a thermostat , which rests for some time till the water arrives at a specific temperature. And, when it does, the thermostat allows the water to flow in order to cool the engine of your car and thus warm your car heater.
A car heater takes some time for blowing out warm air. The heater cannot blow heat until the engine of the car warms up. In order to heat up the interiors of your car, you require:
- Sufficient amount of water in your vehicle’s engine
- A running heater and heater controls
- A functional thermostat
- A leak-free cooling system
Why is My Car Heater Blowing Cold air?
There can be numerous underlying reasons behind the failure of your car heater owing to which your vehicle might be blowing out cool air instead of heat. Some of these reasons include:
- Insufficient amount of coolant in the car engine
- Issues with the heater core like a plugged one
- Broken or blocked heater buttons
- Zaseknutý termostat
Now, let us study these issues in more detail so that you can have a better idea as to what you need to fix in a case of a faulty car heater that blows out cool air. I’ve found this helpful video so that can fix your car that does not blow hot air.
1. Insufficient Amount of Coolant in the Car Engine
Image source: samarins.com
A vehicle employs coolant, which is generally made of 50% water and 50% anti-freeze. The coolant cools down the engine of your car, particularly during scorching summer days. However, during the winter season when you want warm air, the coolant in your car comes to the heater core from the car engine. The heater core blows out heat in your car.
The heater core blows out cool air for a few minutes in the beginning since the car engine takes time to heat up so that it can heat up the coolant and thus warm up the car’s interior. However, if cool air blows out even after a few minutes, then you should check the coolant level in your car’s engine.
Insufficient coolant will not be able to pass through the heater core and thus will not create heat in your car’s interior. Additionally, an inadequate amount of coolant will not even cool your car. If you are facing any issues with the cooling system of your car, then you can vacuum the AC system in your car.
2. Issues with the Heater Core
Image source: ricksfreeautorepairadvice.com
The heater core of your car can also have some problems, such as:
- The coolant might not properly pass through the heater core
- The air coming out of the blower motor is not guided through the right path
- Clogged tubing of the heater core
If your car has enough coolant level and still it is blowing out cool air, then you need to inspect its heater core. In case, you think that your vehicle’s heater core has gone awry, then you need to look for some cues, including a sweet-smelling, fruity stench , fog inside the car, overheating of your car’s engine, or your coolant finishing up very rapidly.
3. Broken or Blocked Heater Buttons
The heater controls of your car can stop working after they have been used for many years. If you have a sufficient amount of coolant level in your car and the heater core is also working properly, then you need to check your heater controls as well as the heater control valve.
You might have to replace them if they have gone amiss. The heater control valve is situated under your car’s hood and is used to turn on or turn off the heat.
4. Zaseknutý termostat
Image source: amerbel.com
Your car thermostat might be dysfunctional in case you see that its gauge is stuck on ‘C’ even after the engine has heated up. A faulty thermostat cannot warn the car that its engine has heated up owing to which the coolant will not be transferred, heat up the heater core, and thus it will blow out cool air.
In such a case, you can fix your car thermostat, which is very economical and easy to do. You can install a new thermostat in your car so that your car heater can work again immediately.
Závěr!
So, these are the reasons as to why your car heater might be blowing out cool air. You can check whether or not your car is facing any of these issues and then fix them accordingly. Your car heater will blow warm air in no time when you take help from the above-mentioned points.
