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Warm air system

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Heaters slow at warming up

In normal circumstances the heater wouldn't begin blowing warm air until the vehicle has travelled 5 miles - call it 5 minutes. That's because the thermostat only begins to open at around that mileage/time and allows coolant to circulate around the engine. Before that - there just isn't any warm coolant in the heater matrix.

After 10 miles/10 minutes of normal driving the engine will be at its correct operating temperature and the coolant will be hotter - as will the circulating coolant in the heater matrix. That's when the heater blows the hottest air.

If you're sure that the heater has lost efficiency it may be due to air being trapped in the heater matrix/coolant system, or a blockage caused by limescale/engine corrosion within the heater matrix itself.

To remove any trapped air, set the heater to maximum, remove the radiator cap/coolant bottle cap and let the engine tick over for 10 minutes.

If the heater matrix is blocked/partially blocked, drain the coolant system, refill with plain water, set the heater control to open .. and let the engine tick over for 10 minutes. Drain it again.

Refill again with plain water and add a can of 'radiator flush'. Follow the instructions on the can of 'radiator flush'.

Drain again and refill with coolant/water.

If the heater is still inefficient then the only option is to replace it - and that's not an easy job.

Jan 21, 2016 | 2006 Nissan Navara 2.5

1 Answer

Wont start when cold

Your Temperature Sensor is bad or has failed. This sensor monitors engine operating temperatures. The signals needed for the ECU to determine whether the engine is cold, warm or hot, then it will set the system to operate correctly for that temperature. Ex. When the engine is cold (first start up) it will supply the fuel system with more fuel for the air/fuel ratio for a richer mixture to start and maintain correct idle.

Dec 05, 2013 | 2000 Volkswagen Beetle

1 Answer

How do i flush the heater core on the 2007 ford tarus

you may have air in coolant system you should have a bleeding point somewhere and good idea to change pressure cab too.
Just becarefull engine coolant and heating system is a pressurized system that works on high temp. can cause a serious injuries!!Safety.
you need to run the car on idle with heat on at high speed and open and close the bleeding valve with proper size and long reach tool
till no air bubbles comeout make sure you run the car enough that thermostat opened and engine run on normal operation temp. for a while.good luck.

Dec 06, 2012 | Cars & Trucks

1 Answer

My 2001 chrysler town and country has no heat and it is overheating?

Hello, the 'no heat' may be caused by not enough coolant in the system, which would also contribute to the 'over heating'. Some things to check: The system needs to 'pressurize' when it warms up. If there is a leak, you may be able to see it by opening the hood, and starting the car, and let it warm up (maybe 5 or 15 minutes). If no leaks detected (look under the water pump, it is what the big fan is usualy connected to), place a damp towel over the radiator cap, and turn counter-clockwise ( loosen) VERY slowly, and listen for a hissing sound. If it does, the system may be getting pressure. You may have an 'air bubble' in the system. Some cars have a bleeder valve on or near one of the cooling hoses. While the car is idleing, in park, with the e-brake on (BE SAFE!) loosen the bleeder valve and let the trapped air escape until coolant comes out. You can add coolant as you bleed out air. It may take 10 or more minutes. You may have a defective thermostat, this is fairly common, and is fairly cheap to replace. Its a temerature controlled valve that turns off the coolant flow to the radiator, to warm the motor up fast, when you 1st start it. Maybe stuck closed. It happens. My secret weapon is to go to the library, request a copy of 'Mitchels Repair Manuals' for your model, and copy the instructions, and follow them to complete the job. Prioritize your choices: 1. Leak 2. thermostat 3. air in system. 4. operator error (got coolant?) Good luck! Let me know what you find, please....Mark

Nov 12, 2011 | Chrysler Town and Country Cars & Trucks

2 Answers

Air conditioner is blowing slightly warm air and not cooling when it is turned on

If after a few minutes it is still warm to hot air, try recharging the cooling system. Parts stores sell kits with instructions on how to do this.

Aug 28, 2011 | 1992 Honda Accord

1 Answer

I have an 1996 Nissan Sentra GXE i live in ND and the heater only blows luke warm air while at full operating temperature. I replaced the thermostat and flushed the heater core which seemed clean....

Sounds like it's the air control flap which determines the mix of heated and fresh air. This could be vacuum controlled or manually with a cable.

Jan 10, 2011 | 1996 Nissan Sentra

2 Answers

I have a 2000 Grand Jeep Cherokee Laredo (6cyl). It was blowing only cold/luke warm air. I replaced the thermostat. Still blowing the same only now the radiator cap is cold but hoses are hot. ...

It is likely you have air in the system. Park on an incline, take the radiator cap off, start the car, let it warm up until the thermostat opens, fill the radiator until it stops going down. See if that doesn't get you some hot air. If not, try the other steps I have in my post at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me.

Dec 13, 2010 | 2000 Jeep Grand Cherokee

2 Answers

The heater in my 2006 Dodge Grand Caravan only blows warm air while on low. If the dial is turned to high it blows cold air. What is the problem?

It sounds like the heater valve is not operating. Find the valve on the engine firewall passenger side and manually open the valve. Find it by following the 3/4 inch heater hose to the firewall where it is connected to the valve. Most likely the cable ( or vaccum hose)from the temperature dial to the valve needs replacing.

Dec 31, 2009 | 2006 Dodge Grand Caravan

1 Answer

1996 toyota celica ac not blowing cold. freon is fully charged & ac compressor cluch is on but just warm air comes out the vents

The flap that directs cold air and warm air may be stuck in warm air position. This flap is controlled by a vacuum operated actuator that is attached to the vacuum lines and the control panel. This can go bad. Otherwise check in compressor sight glass to make sure there is no air bubbles or fog, that would indicate a leak in the system

Sep 25, 2009 | 1996 Toyota Celica

1 Answer

Luke warm air no heat where do i find the bleeder valve

no bleeder ,remove the radiator cap, start car,see if you are cirulatilng good!!
if not replace the waterpump and thermostat!!!
fill system completly up run with the cap off till it reaches operating temp
then make suure the system i s full ,then its burped put the cap back on your done!!!

Apr 11, 2009 | 1995 Ford Escort

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