Question about 1990 Chevrolet Lumina
After an hour and twenty minutes of running the heater my car's heater begins to blow cold air out of the top vents and loses warmth out of the bottom vents. I still get warm air out of the bottom but the warmth can not compensate for the coldness on the upper vents. To maintain an adequate comfort level, I have to increase the car's temperature settings to 74* - 75* and fan speed. This action provides more heat temporarily solving the problem as warm air will blow out of both the top and bottom vents.
This only occurs after I am run the car for one hour and twenty minutes. When I first strat the car in the morning and after the engine wars 71*-72* degrees provide very a comfortable heat setting until I hit the 1 hour 20 minute mark, when cold air begins to blow out the top or the bottom vents loses it's warmth.
Sounds like you may be able to fix it by flushing your antifreeze and back flushing the heater core. Some car owners cheep out and put stop leak into the antifreeze, others dont change there antifreeze at all. Both are mistakes.
Posted on Apr 25, 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 27, 2016 | 2000 Chrysler 300M
May 30, 2014 | Cars & Trucks
Nov 25, 2013 | Cars & Trucks
May 07, 2017 | Mercedes-Benz Cars & Trucks
Nov 22, 2012 | Cars & Trucks
Aug 13, 2012 | Holden Caprice Cars & Trucks
Oct 01, 2010 | 2004 Chrysler Pacifica
Jan 11, 2010 | 2000 Toyota Celica
620 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: