low13 Posted November 15, 2012 Report Share Posted November 15, 2012 My problem is - While the ac is on I hear open and closing of a vent from under the glove box. This occurs when fan is on low and in the auto setting. Cadillac Deville 1997. 115k miles. Thanks for any suggestions. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted November 15, 2012 Report Share Posted November 15, 2012 This may be normal, or it may be due to a vacuum leak causing noisy or excessive servo activity in the temperature control doors. You can check the vacuum by starting the car, putting on the emergency brake, and then seeing if the emergency brake automatically releases quickly when you bring the shifter out of Park. If not, vacuum is not being transmitted through the HVAC system across the car to the servo that releases the parking brake, and there is a loose hose or leak somewhere. Often there is an OBD code when something is wrong with the A/C vacuum system. Read out the OBD codes and post them here; they may tell exactly where the problem lies. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
93SixtySpecial Posted November 16, 2012 Report Share Posted November 16, 2012 I had this issue for a while on my 99 deville, then I ended up with warmer temps on the passenger side after it doing that for awhile. Turned out it was the passenger side temp control actuator that's right behind the glove box. Easy fix and I found one on eBay for about $35. -Dusty- 2006 Cadillac DTS Glacier Gold Tri-Coat with 175,000 miles 1993 Cadillac Sixty Special Gold Mist with 185,000 miles Link to comment Share on other sites More sharing options...
low13 Posted November 17, 2012 Author Report Share Posted November 17, 2012 The parking brake did not release when removed from park to drive. So now the hunt for the missing, broken vacuum line. I didn't check for any codes in the computer. I will start there first. Thank you for the lead any any further help. Link to comment Share on other sites More sharing options...
low13 Posted November 18, 2012 Author Report Share Posted November 18, 2012 Here are codes B1312 C1223 C1224 U1255 Following done: Replace blower fan on fire wall (2 weeks ago) Replace spark plugs and wires (2 days ago) Disconnect electric antenna (last year) Installed delco cd changer in trunk (last year) Thanks for any help. Link to comment Share on other sites More sharing options...
low13 Posted November 18, 2012 Author Report Share Posted November 18, 2012 Found vacuum hose broken near passenger front wheel the line was exiting the vacuum tank going up to the into the engine. Now the codes???? Link to comment Share on other sites More sharing options...
low13 Posted November 23, 2012 Author Report Share Posted November 23, 2012 Kudos to Jim 97. Parking brake works great Thanks for the advice. Replace the vacuum line to firewall from vacuum tank located near passenger front tire. Link to comment Share on other sites More sharing options...
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