2002 sonoma heat problem

Anything related to the factory RPO Crew Cab.

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NHCREWCAB
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2002 sonoma heat problem

Post by NHCREWCAB »

My Sonoma has no heat. From what I can tell the heater core isn't plugged both line coming from it are hot. I don't here any vaccum leaks in the dash that I can here. Could the "vent doors" be stuck so the heat can't get through? Or can someone tell me where else to look?
Thanks :?:
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Post by F9K9 »

Welcome to the board.

August and your worried about heat? Is your coolant system full? That is a good place to start looking. Do a little searching here and I am sure others will chime in. I am off to work. Good luck!
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NHCREWCAB
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Post by NHCREWCAB »

heat in August I know but its been so damp here it clears the windshield in the morning. Plus i'd rather worry about it now then in December.
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Post by NHCREWCAB »

As I am reading i'm seeing alot about a Transfer case swith being a problem? If that goes to hell will there be a smell of ATF fluid in the cab?
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Post by barch97 »

I'm not sure I understand completely. Is it that there's no air blowing out at all or that the air that does blow out is not hot?

If you can hear & feel air blowing out but it's not hot, it's very common for dexcool to gum up and clog the heating system (only takes a very little bit of air to contaminate dex). Even if this isn't the cause, the fix is relatively inexpensive and easy DIY project. A couple gallons of green antifreeze, a flush kit and a new radiator cap should run you under $25. Wost case your heat still doesn't work but you've upgraded your cooling system.

Good Luck.
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NHCREWCAB
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Post by NHCREWCAB »

The heater blows cold air. I don't think the core is clogged becuase both lines coming from the back of the core are equally the same temp.