Question about 1986 Cadillac Fleetwood

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Heater not heating

I've got a 1986 Cadillac Fleetwood. When I turn the heater/defroster, I can hear it blowing, just not getting hot. My husband said it's probably a valve stuck open or shut, which ever it may be. I had a 1984 Chevy Suburban that had the same problem, but I could fix it cause I knew where the valve was. Can anyone tell me where the vavle is on the Cadi. I have small kids and it gets pretty cold in the car.

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I would have the Thermostat replaced first of all. This the least expensive thing to start with. And just may be Your problem. And if not? And You do it Yourself. Then Your only out a few Bucks! Hope this may Help!

Posted on Feb 17, 2009

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Jan 28, 2016 | 2005 Hyundai Tucson

1 Answer

Why is heat not blowing out vents?


Either your heater core is clogged with coolant crud, or your blend door is not actuating between cold and hot. If when you turn the heater control knob from cool to warm and you hear a clicking or gear grinding noise, your blend door gear is probably broken. If not, it is just a clogged heater core. Let the engine warm up, then pop the hood and look for two black rubber hoses running from the engine into the firewall. feel both of these hoses. One should be hot and one should be warm. If one is cold or room temperature, the heater core is clogged and will need to be flushed out.

Jan 04, 2016 | 1990 Cadillac Deville

1 Answer

The heater blower motor doesn't turn off on 1980 Cadillac Fleetwood.


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Dec 02, 2013 | Cadillac Cars & Trucks

1 Answer

95 Fleetwood Cadillac no heat changed water pump and thermostat. The heater core is not bypassed and car stays defrosted help me see why no heat is blowing out. The fan works but no heat


Sounds like a air lock in interior heater core, remove one heater hose under hood and make sure you have flow through heater core. Some vehicles have a valve that controls coolant flow through heater, check on hose for that if no coolant comming out of inter heater hoses.

Nov 30, 2013 | Cars & Trucks

1 Answer

Heat not hot


Have you checked your heater hoses to see if they are both getting hot? If you do and only one is getting hot (really hot) then you may have a clogged heater core. Also you AC/Heat valve may be malfunctioning witch may be the valve or a vacuum issue. Really need more info to help.

Jan 26, 2013 | 1993 Cadillac Fleetwood

1 Answer

How can i get to my heater core to replace it on a 86 cadillac fleetwood 5.0


BROUGHAM

1. Disconnect electric-al connectors at blower motor, compressor cycling switch, power

module and radio lead-in connections.

2. Remove righthand windshield washer nozzle.

3. Remove righthand secondary air inlet screen from plenum.

4. Partially remove rubber molding above plenum.

5. Remove remaining screws and the primary inlet screen.

6. Remove blower motor.

7. Remove two screws securing compressor cycling switch to module and position

switch out of way.

8. Remove AC module cover attaching screws and the cover.

9. Disconnect heater hoses at heater core.

10. Remove screw and retainer holding heater core to frame top.

11. With temperature door in max. hot position, reach through temperature housing and

push lower forward comer of heater core away from housing, then rotate core

parallel to housing.

12. Remove heater core.

13. Reverse procedure to install.

Dec 23, 2010 | 1986 Cadillac Fleetwood

1 Answer

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check to see if your hoses to heater core are hot on both sides. my 93 hoses where hot going in the heater core but not out. I flushed the heater core now I have heat

Dec 12, 2010 | 1993 Cadillac DeVille

1 Answer

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could be but caddy's have 2-3 heat and air computers on there cars that control diff functions of the system seperately either one of them can be and will be bad !! they control the vents to temp control valve and blower i owned enough caddy's to know this!! this is why!! i drive a chev truck today LOL

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1 Answer

Driver's side defroster and heater vents blow cold air but the passenger side blows hot. Both sides should blow hot The temp is set any temp and it still does the same thing. It is winter so I don't know...


The doors that open and close in the heater control unit are ran by motors. It sounds like a motor has quit in yours. When turning on the defrosters the motor closes the door to the heat for the floor

Jan 12, 2010 | 1995 Cadillac DeVille

1 Answer

1995 cadillac deville 4.9 eng no heat


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

Thank you for using FixYa! A FiXyA rating is appreciated!!

Jan 22, 2009 | 1992 Cadillac DeVille

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