CHEVY HEATER BLOWING COLD AIR??

2000 Chevrolet S-10

Tiny

Tonybum13

December, 31, 2011 AT 7:39 PM

New thermostat, radiator full, upper radiator hose hot, A/C seems to b cold. Any ideas?

FOUND 4982 RELATED QUESTIONS

No Heat

37 ANSWERS
5 IMAGES

9 Answers

Tiny

rivermikerat

December, 31, 2011 AT 7:58 PM

Heater hoses hot? Move the temp control selector around and see if the cables to the blend doors are moving properly on the airbox (under the dash). Listen for the blend doors moving inside the box.

Tiny

Tonybum13

January, 1, 2012 AT 3:54 AM

Heater hoses not hot, little warm, can hear change n box when changing temp? Core bad or maybe plugged?

Tiny

rivermikerat

January, 1, 2012 AT 4:18 AM

Is there a valve near the bulkhead before the core? If so, my guess would be it. If not, the core.

Tiny

Tonybum13

January, 1, 2012 AT 4:28 AM

Not exactly sure what a bulkhead is, would it b n engine compartment on firewall or n/under dash?

Tiny

rivermikerat

January, 1, 2012 AT 4:46 AM

Ah-ah-ah. Naughty naughty. Firewall is no longer a legal word to use in conjunction with automobiles since they don't stop fire, or really even slow then down. It is now, legally, a bulkhead. Us old fogies know it and love it (hate it?) As a firewall.

But, yeah, that metal wall separating passenger and engine compartments. If it has a heater control valve, it should be just inside the engine compartment on one of the heater hoses.

Tiny

Tonybum13

January, 1, 2012 AT 4:51 AM

Well no valve, so im looking at the core right? Would flushing it maybe help, its not driven a whole lot as u can tell by the mileage?

Tiny

rivermikerat

January, 1, 2012 AT 5:35 AM

It should. Use something like Prestone, drain it, then use pressurized water to flush it.

Tiny

Tonybum13

January, 1, 2012 AT 5:39 AM

I'll give it a shot flushing it, thank u very much for your time and advice, hope this works, thanks again!

Tiny

rivermikerat

January, 1, 2012 AT 5:44 AM

Have a safe and happy new year!

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