AIR CONDITIONING "OR LACK OF"

[MHORNE]

Air Conditioning "or Lack Of"

My 1989 Coupe, will not blow cold air. The compressor runs, and inside doen't blow anything resembling cool air. I checked the Freon, which is full, the lines coming off of the comp. are all cold, I removed the entire dash to see if there was a door that opens/shuts upon turning on air, and it does work fine, however the ait is hot. What am I to do, I purchased this car 3 weeks ago and with Summer quickly approaching i need help. Under the hood, everything seems to be running as such, IE: cold where it should be, there is a black objst on the fire wall which seems to be where air goes, and I can feel cool air coming out of there, near a rubber like gasket, "feels like putty" that is as far as the cool air travels. Can anyone help? The Chevy dealer has a minimum price of 15o bucks just to tell me what they think is wrong!! wow thats sick. Anyway is anyone can help I would appreciate it!!
I did some checking, and I have electronic controls, The owners manual states that in the off position, If I choose 70 degrees, the system will force all air to the floor outlets, I have it set on 60, and today it was 75 here, and I had hot air blowing in thru the floor, does it sound like an outside air sensor? I have no clue, Im reaching for straws here, another person said to disconnect battery and it would reset, is that correct?

 

[WhalePirot]

I searched and found:

this:

http://www.corvetteactioncenter.com/forums/showthread.php?t=49739&highlight=reset+%22electronic+air%22

which led to,
http://www.idavette.net/tech/c4diag.htm

for starters.

 

[Moonunit 451]

WELCOME to MHORNE I haven't looked at the links that MR Piitot provided, but you'll NEVER go wrong following his advice I'm sure you'll find some info there, proly by, I think SUNCR, who knows all this stuff.

The answer is close at hand

 

[MHORNE]

The links were for a 90-96 veete, Mine is a 89. Will they still be the same?

 

[magoo]

I don't claim to know much about the later generation vettes, which to me this is. I'm trying to learn. But could this be a case where your A/C is fine but your heater controls have failed? I don't even know if your car has a hot water control valve, but if so I think I would check it. I'm pretty sure if both are on, the heater will win. Hope I'm not wastin your time.

Mike

 

[WhalePirot]

The links were for a 90-96 veete, Mine is a 89. Will they still be the same?

My car and my experience is pre-electronic A/C. I intended to nudge you to the search tool above, but also to help with what I suspect is a setup that is similar to yours, by finding the reset that I remember reading about. You won't damage the unit by pressing buttons to seee if the procedure listed in those posts works.



Gee, Moon. Thanks..Now the pressure is on.:L

 

[tyrel]

What do you mean you "checked the freon"? Did you check your high and low pressures with a set of gauges?

Another thing, is there a spray of oil on the underside of your hood, directly above the compressor? If so, you are experiencing shaft seal leak, a common problem on the Denso compressor.

I highly suspect that the freon has leaked out of the system after many years of use.

 

[MHORNE]

Of course I checked the freon with qauges, they read perfect for freon.
I am going to try the above link and see if it is the same for my year.

 

[90SteelBlueCoupe]

Of course I checked the freon with qauges, they read perfect for freon.
I am going to try the above link and see if it is the same for my year.

Maybe check the a/c controller...

I had a problem with my 84 and it was the hot cold lever ... Not sure if yours has a lever or not but I pulled my controller and moved the cable manually ...
it works now but only cold... No heat...

 

[nyernga]

I suspect a clogged evaporator coil. Not the conderser that's in front of the radiator. The one in that "black box" on the firewall.



Len

 

[MHORNE]

How Do I Unclog That?

 

[nyernga]

How Do I Unclog That?

Seperating the two halves of the evaporator shell will expose the coils. Save as much of the black "goo" for reuse. It's not that hard a job. Keep a bucket handy to catch the antifreeze when you remove the heater hoses. You'd be suprised what can get sucked up in there.

Len"w

 

[MHORNE]

NYERNGA,
Tahnx man, you fixed the problem, upon opening the evaporator shell, i found a door which release the cold air into vette, I opened the door and air conditioning worked fine, The only downfall is when i hit the heat button, the door shuts, and doesnt reopen. But being that is almost summer, I reopened it, and will not hit heat button till september, haha if I can keep wifes hands away from it. Anyway thanx so much man , you were a life saver, as well as saving me alot of money and not needed parts from my chevy garage.
Mike

 

[nyernga]

NYERNGA,
Tahnx man, you fixed the problem,

Even a blind squirrel finds a nut every now and then..

be cool:cool

Len