Air mix door on a 1993

[norwegianvette]

Hi. During install of a new stereo something went wron and i do not get hot air (it is hot but not as hot as before). Is there a way i can check that the air mix door operates? i might done something to it when pulling new speaker wires :-( Vacuum seams to be ok but it is kind of warmer in the car when i use the cruise controll ???????

Electronic clima by the way

All help is good help in this matter.

 

[John Robinson]

Heater cruise vacuum valve

This vacuum valve cotrols the vacuum to the heater and cruise. Check to be sure you do not have a broken or leaking vacuum line here. The little plastic line tends to get brittle and break.

<a href="IMG_0004 on Flickr - Photo Sharing!" title="IMG_0004 by bj.robinson@sbcglobal.net, on Flickr"><img src="http://farm4.static.flickr.com/3128/2555098527_ab0f11efbe.jpg" width="500" height="375" alt="IMG_0004" /></a>

 

[vetteoz]

Is there a way i can check that the air mix door operates? .

Get your head under the dash and see if the blend door arm moves when temp changed on the controller.May have dislodged arm from motor to door
Vac controls vent positions

 

[norwegianvette]

Thanks John, i beleave this is on the driver side under the dash so i check it out.

Steve

 

[norwegianvette]

Get your head under the dash and see if the blend door arm moves when temp changed on the controller.May have dislodged arm from motor to door
Vac controls vent positions

I tried this but cant see any movable parts, just that round thing vhere the vacuum line goes in. Which movement should i look for?

Steve

 

[vetteoz]

Which movement should i look for?

Unsure about '93 but on my '87 there is a motor unit mounted under the A/c ducting on the pass side.
Has steel rod with plastic clip that operates the blend door in ducting above.
Edit. reading some blend door posts on other Forums appears later models have motor shaft connected directly to blend door without a linkage

Corvette Forum - View Single Post - 90 climate control issues ????

 

[Kenny]

Under the hood next to the radiator resivour is the blower motor speed controler. Remove it and you can see the blend door and watch it move. Also do the lights flash on the control head? That would indicata a code set in the hvac unit.

 

[norwegianvette]

Under the hood next to the radiator resivour is the blower motor speed controler. Remove it and you can see the blend door and watch it move. Also do the lights flash on the control head? That would indicata a code set in the hvac unit.

No codes showing, is it normal that the controll unit fails? Thinking by replacing that as a first step, just strange it happened after i put in a new stereo.

Thanks,
Steve

 

[norwegianvette]

Get your head under the dash and see if the blend door arm moves when temp changed on the controller.May have dislodged arm from motor to door
Vac controls vent positions

Can i refasten the arm from under the glovebox or is this a major operation, It looks like the arm is off. Cruise works and it seam to be vacuum as normal.

Steve

 

[norwegianvette]

I did the diagnostic test and when set to max cold #24 shows -153 (253) as it suppose to but on full heat it comes with 02, not 00. Does this mean it is operating but wont open full for heating? I do not want to mess with that door if i dont have to.

Steve

 

[tdf]

Follow Up

Did you figure out what the issue was? If you did't; don't overlook that blend door control setup as previously suggested . I know the early C4s have a different linkage (no clip on your model - someone on CAC posted) but the symtoms would be similar if the actuator motor was not working or at least not moving the blend door as designed.

 

[norwegianvette]

Did you figure out what the issue was? If you did't; don't overlook that blend door control setup as previously suggested . I know the early C4s have a different linkage (no clip on your model - someone on CAC posted) but the symtoms would be similar if the actuator motor was not working or at least not moving the blend door as designed.

Stil the same. Motor is working as i can change temperature. The issue is that it want be as warm as it used to be before i was fiddeling by it.

Thank you for your addvice.

Steve