HVAC Problem
Thread Starter
Pro
Joined: Sep 2000
Posts: 703
Likes: 0
From: Cowtown
HVAC Problem
Hello all -
I seem to be having an HVAC problem.
No matter what setting I choose (floor vents, upper vents, both, defrost, etc.) I get air coming out of all the vents, however at VERY low pressure.
The control unit seems to be working properly in that it visually acts like it is changing to the modes I select. The fan also seems to be working properly. I can adjust its speed up or down, but it seems that the air coming out of the vents is very low pressure, almost so low you can't really tell its on (but the fan sounds normal)
I can get hot or cold air, so those cooling and heating systems seem to be working correctly.
I checked the codes and no HVAC specific codes. (These are all history codes)
Any suggestions before a visit to the deaded dealer?
Thank you.
I seem to be having an HVAC problem.
No matter what setting I choose (floor vents, upper vents, both, defrost, etc.) I get air coming out of all the vents, however at VERY low pressure.
The control unit seems to be working properly in that it visually acts like it is changing to the modes I select. The fan also seems to be working properly. I can adjust its speed up or down, but it seems that the air coming out of the vents is very low pressure, almost so low you can't really tell its on (but the fan sounds normal)
I can get hot or cold air, so those cooling and heating systems seem to be working correctly.
I checked the codes and no HVAC specific codes. (These are all history codes)
Any suggestions before a visit to the deaded dealer?
Thank you.
Safety Car
Joined: Dec 2002
Posts: 4,010
Likes: 1
From: SE Idaho
St. Jude Contributor
Re: HVAC Problem (ScreaminDemon)
I know when in the floor mode, air is bled through all the other vents; something like 5 percent to the other vents, remainder to the floor. I believe this might be true for all other modes too.
These modes are controlled by vacuum being applied to the mode actuator and/or the defrost actuator; depending on mode selected.
Can't determine how much is "leaking" past the doors to the other outlets, but a small amount might be considered normal. If not, let the dealer fix since these can be a pain in the rear to service; depending on their location in the HVAC module. If all the doors are not switching when commanded, the head unit may not be working or the vacuum reservoir could be damaged. Then again, it could be something simple like a vacuum line falling off.
If you know someone with another C5, you could compare...
These modes are controlled by vacuum being applied to the mode actuator and/or the defrost actuator; depending on mode selected.
Can't determine how much is "leaking" past the doors to the other outlets, but a small amount might be considered normal. If not, let the dealer fix since these can be a pain in the rear to service; depending on their location in the HVAC module. If all the doors are not switching when commanded, the head unit may not be working or the vacuum reservoir could be damaged. Then again, it could be something simple like a vacuum line falling off.
If you know someone with another C5, you could compare...
