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The hoses off the heater core and flush it really well with a garden hose. a little bit of debris could be clogging the core. also you can give the engine a few good high revs and bust it loose. i had the same problem.
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Not sure how much time you are talking about. The heat you get is from the water in the engine. The heater will not blow hot air till the engine coolant water heats up. The engine water flows through the heater coil under the dash air will blow across the heater coil and give you hot air coming out the vents. Engine has to heat up before you get hot air from you heater.
Jun 25, 2009 - Hot air from vents-driver side and cool air from vents on passenger side. ... The driver's side vents were blowing out hot air, and everything else wasblowing cold. ... you'll literally have to restart your tahoe/yukon at every traffic light to keep cold air coming ... I was also getting air only out of the defrost vents.
? 3:14
https://www.youtube.com/watch?v=5lnd8UNcx6M
Aug 3, 2013 - Uploaded by South FL Mud Club
Suddenly hot air started blowing out the air vents only on the drivers... ... is a very helpful video ,I wondering if this part number apply for my 04 chevy tahoe? .... I have cold air out of thepassenger side, but warmer air out of the driver's side. .... 2003 Tahoe No Rear Heat Fix, Suburban, Yukon XL Repair!
Driver/passenger air vents blow hot then cold when using A/C. Back to cold when you restart the vehicle. Upvote (35) ... 2003 Chevrolet Tahoe ... I have a 02 Tahoe ,and the heat system is working only on the ceiling side of the car when turn.
Thermostat is sticking or heater core is blocked.do not keep running it or it is going to ruin the engine. It is running hot regardless if is blowing cool or hot air. Do not keep using the car.
Heat is only supplied through floor ducts, as hot air tends to rise up to ceiling to create circulation of hot air inside the car, same way cold air (AC) is only supplied through roof ducts as cold air tends to settle down.
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