crich8136 Posted August 1, 2018 Report Share Posted August 1, 2018 1998 Deville. The A/C used to switch back and forth between the dashboard vents and the defrost vent. Now it only comes through the defrost vent. How can I fix it? Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 1, 2018 Report Share Posted August 1, 2018 Do you know how to check for codes? If so check and post B or body codes Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
barczy01 Posted August 1, 2018 Report Share Posted August 1, 2018 Check the vacuum line near the right firewall, make sure there is sufficient vacuum. Link to comment Share on other sites More sharing options...
crich8136 Posted August 1, 2018 Author Report Share Posted August 1, 2018 The only B codes I get are B2710 and 2711, both Historical. Link to comment Share on other sites More sharing options...
BodybyFisher Posted August 2, 2018 Report Share Posted August 2, 2018 Since it was a 98 I was checking to see if the vacuum actuator was replaced by a electrical actuator, based on barczy01 speaking of the vacuum it seems the mode door is vacuum actuated. Check under the dash on the passenger side for a multicolored manifold, check for vacuum at that manifold and try to reset the vacuum lines in that block. Vacuum is supplied to that area from under the hood. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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