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The mkiv Supra Owners Club

Heater problem - I have used the search!


Amir khan

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Sorry to be making many treads

 

The problem i am having sounds opposite to everyone else.

My heater only blows out HOT air always. even when set to cold with AC on its still HOT!

 

I have no clue where to start with this and in the few hot days we get (unlike today :cool:) its very annoying!

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I realise that this may not be totally helpful but my wife had the same problem on her Skoda (will I get points knocked off for using the wrong kind of 'S' word on this forum?) :)

 

The problem there was with an electronically controlled valve/vent/gate whose job it was to 'blend' the hot air (from engine) and cold air (from outside or a/c) to to the desired temperature: it was stuck in one position, only allowing in hot air. Maybe something similar here on the Supra?

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I had this the other day after fitting a new stereo.

I took the dash back off and traced it to a loose connection round the heater controls. Made sure all the connectors were plugged in, refitted the dash panels and it's been fine since. Don't know if this helps.

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as said it definately sounds like the control valve is stuck, have you had the dash off ? maybe unplug all the connections to the heater controls and the heater ecu (cream coloured box marked ABS) on top of the radio/cd player and make sure they all positively plug back in, i had a problem with my heating where it was either like a flame thrower or when you dialed the temp down to the point where it went onto re-circ it was stone cold there was no adjustment inbetween, it turned out to be the heater ecu

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Hi guys, I havnt had the dash out as iv just recently got the car.

 

At the moment the dash is out (for spaying) so when i put it in il be sure to check all the wires.

 

Q: After taking the dash out i can see there are two connectors at the bottom one goes to the slip control switch and the other nowhere, I dont have a active spoiler button.

My question is were all the cars fitted witht the same wiring loom but without the ECU and buttons?

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...

My question is were all the cars fitted witht the same wiring loom but without the ECU and buttons?

 

I don't think any non-UK cars had the wiring for the heated seats (separate loom) and whether all cars had the active spoiler wiring fitted is a moot point (maybe all ABS fitted cars do). Unless an active spoiler was fitted and subsequently removed (maybe your front bumper isn't stock?) I would expect the switch socket to be taped back, out of the way.

 

I seem to think that there may be some sort of interior temperature sensor on the front dash panel near here (behind a few small slits) - maybe you have found the problem?!

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