Air Conditioner blows hot air only!
Thread Starter
Melting Slicks
Joined: Mar 2001
Posts: 2,372
Likes: 51
From: New Milford CT
Air Conditioner blows hot air only!
Is there a fuse or something I can check? Anyone know of a good dealer to fix it under warranty in western Connecticut? (2001 18,000 mile coupe)
Racer
Joined: May 2001
Posts: 376
Likes: 1
From: Scottsdale AZ
Re: Air Conditioner blows hot air only! (CJS)
I don't know of a local dealer but I can almost guarantee you it's your outside temp sensor that is bad. If you look at the display the car probably is telling you it's 65 outside when it's really 105.
Le Mans Master
Joined: Jun 2000
Posts: 5,653
Likes: 1
From: Lone Tree CO
Re: Air Conditioner blows hot air only! (buddha)
I don't know of a local dealer but I can almost guarantee you it's your outside temp sensor that is bad. If you look at the display the car probably is telling you it's 65 outside when it's really 105.
I checked the sensor and found out that it had become disconected. Plugged it back in and she is blowing cold air just fine! :cheers:
Drifting
Joined: Dec 2000
Posts: 1,516
Likes: 0
From: Shelton CT
Cruise-In II Veteran
Re: Air Conditioner blows hot air only! (CJS)
Hi there,
I would also check for codes, as you might have to rehome the mix doors, as this does happen sometime.
Please keep us posted, c4c5 :chevy
I would also check for codes, as you might have to rehome the mix doors, as this does happen sometime.
Please keep us posted, c4c5 :chevy
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Pro
Joined: Mar 2001
Posts: 512
Likes: 19
From: Greensboro NC
Re: Air Conditioner blows hot air only! (c4c5specialist)
C4c5, how does one go about homing the mix doors. My AC was fine yesterday, and today it was blowing marginally cool air but not out the front vents as usual. It was actually blowing air out the defrost, front and floor vents when the display was reading a mode of front vents only. Any ideas?
Thanks,
Frank
Thanks,
Frank
Pro
Joined: Sep 2000
Posts: 505
Likes: 0
Re: Air Conditioner blows hot air only! (QwikSilvr)
You might try disconnecting your battery for 20-30 minutes, then reconnect it and try the HVAC. Some have reported success after trying this. It causes the actuators to move the temperature doors through their complete cycles. It forces them to traverse from full hot to full cold. Sometimes this technique will free up a sticking temp door. If that is your problem. You really need to pull your codes. That will tell you specifically where to look for the problem. You might also try pulling fuse # 27 from the passenger side footwell fuse box and then reinstalling it. This will supposedly accomplish the same thing. Both of these trouble shooting techniques are spelled out in the service manual. I tried them both, didn't help me. But when I pulled the codes, I found that I had a bad temp control actuator on the passenger side. Good luck!
Drifting
Joined: Dec 2000
Posts: 1,516
Likes: 0
From: Shelton CT
Cruise-In II Veteran
Re: Air Conditioner blows hot air only! (QwikSilvr)
Hi there,
You may have a vacuum source condition, as if your mode does not change when selected, your vacuum acuators may not have any vacuum source, to control the change.
I believe that this would be a different issue than that of the original posting.
Please keep us posted, c4c5 :chevy
You may have a vacuum source condition, as if your mode does not change when selected, your vacuum acuators may not have any vacuum source, to control the change.
I believe that this would be a different issue than that of the original posting.
Please keep us posted, c4c5 :chevy
Pro
Joined: Mar 2001
Posts: 512
Likes: 19
From: Greensboro NC
Re: Air Conditioner blows hot air only! (c4c5specialist)
c4c5,
That's exactly what it's acting like. When I change modes, nothing changes as far as air flow. Any ideas where to start? Is there something electrical like a fuse that I can check. I don't want to take it in for service :U if at all possible. Any and all tips are greatly appreciated.
Frank
That's exactly what it's acting like. When I change modes, nothing changes as far as air flow. Any ideas where to start? Is there something electrical like a fuse that I can check. I don't want to take it in for service :U if at all possible. Any and all tips are greatly appreciated.
Frank
Drifting
Joined: Dec 2000
Posts: 1,516
Likes: 0
From: Shelton CT
Cruise-In II Veteran
Re: Air Conditioner blows hot air only! (QwikSilvr)
Hi there,
I would start by removing the passenger side inner fender, and looking to the rear of the PCM holding fixture.
There is a black cylinder, which acts as your vacuum reservoir. At the bottom, there will be a vacuum line, which is your source supply to the HVAC mode actuators.
Trace this line, and I think that you will find a broken or eaten away vacuum line. Once this is repaired, you should be just fine.
Also, check for any acid damage from a leaking battery, as my theory is that there is more there than just the hose. Look for any whitish deposits on the PCM casing, and the wiring harness.
Please keep us posted, c4c5 :chevy
I would start by removing the passenger side inner fender, and looking to the rear of the PCM holding fixture.
There is a black cylinder, which acts as your vacuum reservoir. At the bottom, there will be a vacuum line, which is your source supply to the HVAC mode actuators.
Trace this line, and I think that you will find a broken or eaten away vacuum line. Once this is repaired, you should be just fine.
Also, check for any acid damage from a leaking battery, as my theory is that there is more there than just the hose. Look for any whitish deposits on the PCM casing, and the wiring harness.
Please keep us posted, c4c5 :chevy
Pro
Joined: Mar 2001
Posts: 512
Likes: 19
From: Greensboro NC
Re: Air Conditioner blows hot air only! (c4c5specialist)
c4c5,
I pulled the inner fender and found the vacuum reservoir. I inspected the lines there and followed them to where they go thru the firewall area under the battery compartment and found no problems. :sad: I did pull the hose off the reservoir and got no vacuum at either the reservoir or the hose end. I pulled the codes from the computer and got this code pertaining to the HVAC system:
99 - B0441 H C
It appears the B0441 code means: Left Actuator Out of Range
Any ideas?
Frank
I pulled the inner fender and found the vacuum reservoir. I inspected the lines there and followed them to where they go thru the firewall area under the battery compartment and found no problems. :sad: I did pull the hose off the reservoir and got no vacuum at either the reservoir or the hose end. I pulled the codes from the computer and got this code pertaining to the HVAC system:
99 - B0441 H C
It appears the B0441 code means: Left Actuator Out of Range
Any ideas?
Frank
Pro
Joined: Mar 2001
Posts: 512
Likes: 19
From: Greensboro NC
Re: Air Conditioner blows hot air only! (QwikSilvr)
One more thing; there's a large rubber hose directly behind the PCM about 2 inches in circumference. I noticed this hose is split open on the end, even though it appears it was meant to be sealed because of it's tapered end. What is that hose and is it supposed to be open?
Frank
Frank
Drifting
Joined: Dec 2000
Posts: 1,516
Likes: 0
From: Shelton CT
Cruise-In II Veteran
Re: Air Conditioner blows hot air only! (QwikSilvr)
HI there,
First, the large rubber hose is the cowl air box drain. However, just make sure that the drain is clear.
As for the canister, you should have had vacuum there, when you disconnnected the line.
I would attempt to start the car, and see if you have vacuum at the hose.
If you do NOT, there is a problem with that hose.
besttoyou, c4c5
PS Has the intake been off the car???\
:chevy
First, the large rubber hose is the cowl air box drain. However, just make sure that the drain is clear.
As for the canister, you should have had vacuum there, when you disconnnected the line.
I would attempt to start the car, and see if you have vacuum at the hose.
If you do NOT, there is a problem with that hose.
besttoyou, c4c5
PS Has the intake been off the car???\
:chevy
Pro
Joined: Mar 2001
Posts: 512
Likes: 19
From: Greensboro NC
Re: no vacuum at the canister hoses (c4c5specialist)
When I checked for vacuum at the canister, it was with the car running. I had hoped that you were right earlier by guessing it may be one of the hoses that was shot. As far as I can see, the hoses (there are 2 of them) are both ok. I attempted to follow them, but once they go over the frame into the engine compartment, they are d@mn near impossible to follow. I think the one that goes to the engine for vacuum goes behind the engine near the firewall. I have no clue where that hose connects. I'm wondering if it is broken, cracked or has come loose from its connector. Do you know where that hose connects on the intake. As far as I know, the intake hasn't been off, but I'm not the original owner. Would I have to take the intake off to get to the connection at the intake? Thanks for your time and expertise. :chevy :yesnod:
Drifting
Joined: Dec 2000
Posts: 1,516
Likes: 0
From: Shelton CT
Cruise-In II Veteran
Re: no vacuum at the canister hoses (QwikSilvr)
Hi there,
The other end to the hose, is directly at the back of the intake.
Unfortunately, yes, the intake will have to be slid forward, to see this connection.
Besttoyou, c4c5 :chevy
The other end to the hose, is directly at the back of the intake.
Unfortunately, yes, the intake will have to be slid forward, to see this connection.
Besttoyou, c4c5 :chevy
Burning Brakes
Joined: Jun 2002
Posts: 908
Likes: 0
From: Waipahu Hawaii
Re: Air Conditioner blows hot air only! (NoMercy)
NoMercy. Double Clutch here!! Not to be rude, but I had no idea that you were on the same island as my self, and, you wont be seeing any waves from me any time soon....... if I can help it......... you see.... when I do spot you from what ever direction your coming from... I'm practicly going to kill my self, trying to get the heck as far out of the way, as humanly possible from that monster machine that you call an automoble, but should call a U.F.O because of the rediculous speed that, that craft can reach in such a short distance!!!!!!! :eek: :jester ( My good buddy told me about your car and I thought I'd mess with you a little.......on the forum NOT ON THE ROAD!!!!:D) I'm on the C-4 forum. Aloha!! :seeya
[Modified by Double Clutch, 3:58 PM 7/22/2002]
[Modified by Double Clutch, 3:58 PM 7/22/2002]