Jump to content
CaddyInfo Cadillac Forum

a/c wont turn off when blower activated


Recommended Posts

i recently bought a 98 deville, and 2 days after i bought it the HVAC system started acting up. i can have the heat set at 90 but it will blow cold on the driver side only. the passenger side blows as it should. when i had the hood popped i noticed the condinsation on the ac lines and the compressor turning on. any thoughts on what this may be? i am new to these cars but have done some searching and what i have seen similar is the driver air mix actuator has gone bad, but would this make the a/c run all the time?

TIA

Matt

Link to comment
Share on other sites


It could be an air mix door actuator or a partially clogged heater core. Try flushing the core before replacing parts unless you have a DTC for an actuator.

A/C runs all the time in the defrost mode and in auto when the ambient temps are above about 35F. Econ should disable the compressor.

Link to comment
Share on other sites

Ive been told the a/c runs when the heat is on to dry out the air coming into the car? Otherwise your car would fog up with just heat on cold windows. I believe thats why some cars have a/c buttons so you can run heat and shut off the a/c at the same time, to save on gas mileage a little I guess. Ive used it this way anyway. It does fog up without the a/c on.

* 1966 Deville Convertible

* 2007 Escalade ESV Black on Black

* 1996 Fleetwood Brougham Black on Black V4P -Gone
* 1983 Coupe Deville Street/Show Lowrider -Gone

* 1970 Calais 4dr Hardtop GONE
* 2000 Deville DTS - Silver with Black Leather and SE grille GONE
* 1999 Seville STS - Pearl Red GONE

Link to comment
Share on other sites

Ive been told the a/c runs when the heat is on to dry out the air coming into the car?

Correct, but I believe is gets disabled below about 35 degrees. Your ECON button is the A/C bypass switch.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...