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1988 cadillac will not heat up

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jlksk17
New User

Oct 3, 2009, 2:24 PM

Post #1 of 5 (3084 views)
1988 cadillac will not heat up Sign In
just bought a 1988 cadillac sedan de ville. cannot get the heat working.fuses are good. just recharged air conditioner. heater will not come on unless i unplug the 25 amp fuse. then it only comes on momentarily. Is there a thermostate somewhere in the system to change out. It is a digital in-dash single a/c- heat system. manufacture date of car is 4-88.tthank you
judy


profleet
Novice

Oct 4, 2009, 6:22 PM

Post #2 of 5 (3073 views)
Re: 1988 cadillac will not heat up Sign In
Need to clarify is the problem that no air blows through the vents or is it the air does not blow hot?
which 25 amp fuse are you unplugging?
Cadillac heating systems will not turn on until the vehicle senses that the engine coolant and air temp at the heater core is warmer than the outside air temp.

link deleted.......not allowed


(This post was edited by Hammer Time on Oct 4, 2009, 6:30 PM)


jlksk17
New User

Oct 5, 2009, 9:15 AM

Post #3 of 5 (3068 views)
Re: 1988 cadillac will not heat up Sign In
thank you. Air is blowing-just not hot. Looks like we will need a new thermostat. appreciate your help!
judy


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 5, 2009, 9:32 AM

Post #4 of 5 (3064 views)
Re: 1988 cadillac will not heat up Sign In
 With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch.

If they are. then the engine and heater core are good and the problem is in the electronics under the dash.



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jlksk17
New User

Oct 5, 2009, 11:36 AM

Post #5 of 5 (3058 views)
Re: 1988 cadillac will not heat up Sign In
very helpful comment. we will check that out. thanks. Smile
judy





 
 
 






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