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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...   2020 suburban new transmission and issues after install recently had the transmission fail at 11...   Caliper piston post cleaning won't screw in Hello, 2013 Hyundai Elantra limited (ma...

Search Auto Parts Search 1988 cadillac will not heat up Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Car Troubleshooting jlksk17 New User Oct 3, 2009, 2:24 PM Post #1 of 5 (2617 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 (2606 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 (2601 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 Oct 5, 2009, 9:32 AM Post #4 of 5 (2597 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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. jlksk17 New User Oct 5, 2009, 11:36 AM Post #5 of 5 (2591 views) Re: 1988 cadillac will not heat up Sign In very helpful comment. we will check that out. thanks. judy   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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