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A/C Blowing When I Want Heat

Tiny
JYOUNGBLOOD
  • MEMBER
  • 1991 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 89,991 MILES
Basically It's Winter And I Want Heat. Tonight I Replaced The Thermostat, Checked The Air Mix Door, Felt The In Out Lines For The Heater Core And Still No Heat.

But here's the catch. When I Hit Auto And Turn It Up To 90 Degrees The A/C Kicks on and I get 60 degree air coming out.

I've gotten heat for BRIEF seconds when driving and the ECC happened to be set at 90 and I randomly felt hot air on my legs but thats the only tease I get.

Thanks For Your Time,
Jimmy
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Friday, January 7th, 2011 AT 4:57 AM

10 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Need to enter self diagnostics so key on no start Depress on CCP ie. ECC Off and warmer simultaneously 8.8.8 will appear in Fuel Data Center and - 188 in CCP then.E orF will apear in FDC. See instructions. Psot codes will advise
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Friday, January 7th, 2011 AT 2:08 PM
Tiny
JYOUNGBLOOD
  • MEMBER
  • 6 POSTS
Ok I followed instructions as the diagram shows. Light illuminated on ecc are high fan and off. There are no codes beside the 7.0 on the fdc. What's my next step?
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Friday, January 7th, 2011 AT 3:18 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
O.K. At 7.0 follow directions in next screen will check for faults
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Friday, January 7th, 2011 AT 4:29 PM
Tiny
JYOUNGBLOOD
  • MEMBER
  • 6 POSTS
Sorry but real quick am I looking for differences In the codes in each section or am I looking for something that automatically tells me what's wrong. I'm doing the step but don't know if I need to be upping numbers or something
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Friday, January 7th, 2011 AT 7:02 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Looking for codes I will look up and tell you what they mean Get a letter and two digit number
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Friday, January 7th, 2011 AT 8:28 PM
Tiny
JYOUNGBLOOD
  • MEMBER
  • 6 POSTS
Steps go without flaw until I hit high then low for ecm output I get e96 e1.2 followed by clicking noise
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Friday, January 7th, 2011 AT 9:06 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check operation of Air-Mix door remove glove box looking for rod attached to door see diagram set temp to 90 allow two minutes for programer to move unclip did in move to max travel. Next temp to 60 does it travel to min? If good suspect in car pemp sensor behind CADALLAC emblem upper trim panel. Remove unplug with OHM meter measure resistence after 30 mins in refrigrator should be high now let warm at room temp does resistence go down?
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Friday, January 7th, 2011 AT 9:30 PM
Tiny
JYOUNGBLOOD
  • MEMBER
  • 6 POSTS
ARM moves completely to both sides. Do I need to remove anything besides the glovebox to access it. And what does it look like
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Friday, January 7th, 2011 AT 9:42 PM
Tiny
JYOUNGBLOOD
  • MEMBER
  • 6 POSTS
The in car temp sensor
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Friday, January 7th, 2011 AT 9:55 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Behind CADILLAC emblem on upper trim panel looks likde small tube with wires attached
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Sunday, January 9th, 2011 AT 9:23 PM

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