2000 Chevrolet Suburban 1500 Q&A
2000 Chevrolet Suburban 1500 Question: Heater blows cold air
I don't think you will have much success "blowing out" the heater core of your 2000 Chevrolet Suburban 1500. The best bet when having heater core issues is to replace the failed part. You can try "back flushing" the heater core using a garden hose - careful with the pressure! Just be mindful of how you dispose of the coolant if you decide to try flushing or replacing the heater core. - Oakman
I had success flushing the core by reversing the flow of water. I put the hose on the outlet/return side of the core. - Shadetreejr
We had the same issue. The rear heat blew out really hot and was almost enough to heat the whole truck, but the front was just blowing the cabin air around and not heating it at all. I flushed it out with low pressure water in the opposite direction direction of normal flow. The fluid that came out originally was really nasty so I flushed until the water coming out was clear. I put the hoses back on and fired up the truck and as soon as the engine was hot the front heat was also hot. Now both front and rear work great. My truck is a 2000 Suburban 1500 and this was much cheaper than the $91 heater core from the auto parts store. - sfreitas20
Why would my rear heater be blowing cold air?
Heater was blowing cold air today but eventually started to blow hot.
One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored...
the rear air blows cold no matter what setting its on. tried adjusting the heat on the front and rear coontrols still no change it always blow s cold air.. the front heater blows hot as usual..... ...
I've replace my thremostat and my heater is still blowing out cold air. What could be the prolem?