Question about Cars & Trucks

1 Answer

Heater runs too hot

Heater runs hot even in the off position.

Posted by on

  • Daniel Jordan Nov 02, 2012

    When the temp switch is turn all the way cold the heater is still pumping out very hot air.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has achieved Level 3.

  • Master
  • 444 Answers

Blend door in heater box has to be adjusted, Or your temperture control switch is not working (Properly)

Posted on Nov 02, 2012


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The heater runs hot in all positions even with ac on its.a 2007mazda6

Have you checked all your fuses ? Then you might want to verify that you don't have a leak of refrigerant from your vehicle A/C system.

Dec 18, 2016 | Mazda MAZDA6 Cars & Trucks

1 Answer

Why am I not getting hot air inside my car when I move the selector switch to red, even if the fan or aircon is running?

Either your heater core is plugged or the blend door under the dash is not moving from cold to hot. Do you hear any noise from under the dash when you move the dial from coldest to hottest? If not then likely the blend door is stuck in the cold position.

Jul 30, 2015 | 1997 Mitsubishi Galant

1 Answer

99 Navigator-Radio and heater continue to run with ignition in OFF position. Ignition switch has been changed.

Stuck ignition relay possible. With hot battery, turn key off and then feel each relay. If you find a hot one, change it.

Jan 15, 2015 | 1999 Lincoln Navigator

1 Answer

Toyota heater no warm air for 15mins

Sounds like an air lock!
To Check....
With engine cold set heater to hot position.
ID return pipe from heater under the hood. Remove the return pipe at one end to check if coolant is there ( it should run from heater pipe) if no coolant you have an air lock.
To remove air lock top up coolant header when engine is cold. Leave heater in cold position replace pipe and start engine. Allow it to come to working temp then set heater to hottest position. Allow a few seconds and check if the pipe you first removed is hot. If no then ease the securing clip and carefully allow air to escape while engine is running... place a cloth over this area to prevent hot coolant spraying out. When coolant appears re-tighten pipe.
If you're not confident enough to do this ask a qualified mechanic to do it for you.
Again please be careful.

Oct 24, 2013 | 2000 Toyota Land Cruiser

1 Answer

2001 Silvarado 2500 Hd the temperature control switch does not control temp; it just blows very hot. The A/C does not seem to kick in with the switch tuned on to make the temperature even a little cooler....

If it seems to blow even hotter air when the A/C is on then yes you have a leaking A/C system. It will still activate because it isn't empty yet. Another possibility is the temp door actuator isn't closing to the cold position. When you turn the fan off or to low, adjust the temp from full hot to full cold (just with key in run position, not with engine running). Look up at the heater control box on the drivers side just above the gas pedal, and you should see a white triangular plastic box. You should hear the actuator move or even see the rod in center of box turning. If not the actuator is faulty.

Jan 26, 2011 | 2003 Mitsubishi Outlander

1 Answer

My heater switch seems to be stuck on hot air all the time. Replaced switch but same problem.

under the alternator there is a control valve located in line from the water pump to the heater core, your control switch operates this valve via air. have someone or you can do it yourself turn switch to hot,LOL already there,ok locate this valve and notice the position of the rod on valve. now turn control switch to cold position, recheck position of rod again, did it move? pull air line off valve,or follow air line up a little bit and you will find a coupler, you can disconnect it here. while engine is running put finger over hose and check for suction in cold and hot position. Should only **** in hot position. if ok your inline valve is bad. cheap fix

Jan 04, 2011 | 1998 Ford Explorer

1 Answer

Ac compressor goes on an off,even when the a/c is off... The heater works fine ..... The a/c works occaiconally....The system has been filled 2 months ago.... No leakage...... The compressor always stops...

Most cars and trucks are set for the A/C to run in defrost. Even if you have the temp at hot. The air will pass through the evaporator core first witch draws moisture out of the air. That is why you see water dripping out of a car with the air on and sitting at one place.

The dry air makes the defroster work faster. It is a safety feature.

Aug 27, 2009 | 1998 Chevrolet Tahoe

2 Answers

Heater blows hot air in all control settings 98 Ranger

There is small cable that runs from the back of the temp control switch on the console that goes through the firewall and loops around a valve on the heater hose that is used to control the amount of hot coolant that goes into your heater coil. This cable hooks on the back of the temp control switch also. Bad news, that's probably where it came off and you'll have to pull the control unit out of the dash to get to it.

Aug 11, 2009 | 1998 Ford Ranger SuperCab

3 Answers

Heater blowing cold air.

Check the water contol valve operation ( under hood connected to heater hoses), do you have a full load of coolant?, also air mix door under dash, is the temp of the coolant hot?.Check them all out, you'll find it

Jan 03, 2009 | 2001 Volkswagen Passat

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

36 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

80637 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

15427 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides