Question about 1991 Cadillac DeVille
Even whenit set on 90 it blows cool air.
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.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.
Posted on Jan 14, 2009
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jan 28, 2016 | 2005 Hyundai Tucson
Jan 25, 2016 | Cadillac Cars & Trucks
Jan 10, 2016 | 1993 Cadillac DeVille
Jul 02, 2017 | 1997 Mercedes-Benz C-Class
Jan 06, 2011 | 2004 Chevrolet TrailBlazer
Dec 07, 2010 | 1999 Mitsubishi Diamante
Dec 01, 2010 | 1994 Cadillac DeVille
Nov 01, 2010 | 1999 Cadillac DeVille
405 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: