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I got a 1988 chevy k5 blazer 4x4 tbi 350 with a heater issue. I replaced the radiator (because it had a leak), thermostat, and cleared the heater core out. Blender door is working but very little heat coming out. I looked for the heater control valve and can't find it. Where is this dang thing or what am I doing wrong?

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  • 44 Answers

It doesn't have a heater control valve. You might have the heater hoses on backwards. Try switching them.

Posted on Nov 19, 2014

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Posted on Jan 02, 2017

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SOURCE: No Heat for 2001 Chevy Blazer

All I did with my 1999 blazer is pull the a/c fuses from under the hood and heat blows just fine.
good luck

Posted on Dec 04, 2008

DAD5bbbbg
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SOURCE: replace a steering column on 1989 chevy k5 blazer

The best thing to do is to buy a Chilton,s repair manual. It has step by step procedures. You can get one at most auto parts stores. They coast anywhere from $10-$30 dollars.

Posted on Mar 16, 2009

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SOURCE: both hoses to heater core are hot, blender door

if the air is definatly being blown through the heater core , then the core is blocked.if there is no hot coolant passing through the core then ------no warm air ---give it a good look see if you can see the deflector guiding the blown air is going far enough to send majority of air through heater good luck

Posted on Aug 22, 2009

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SOURCE: where is the heater control valve on my 1995 camaro 3.4 v6

If yours has a control valve, it will be inline in a heater hose just ahead of the firewall. before taking it out make sure it has a vacuum line attached. If I remember correctly, default is heat. I hope you checked the vacuum motors on the heater box and made sure that the plenum doors are operating and not jammed while you had it out!!

Posted on Oct 06, 2009

ourhowse
  • 2007 Answers

SOURCE: 88 s-10 PU 2.5 TBI hard to start after sitting

As far as the poor running and hard starting, yes, it could be egr or valves or timing or almost anything. Your heat problem : I suspect the heater core may be air locked. With the engine running, loosen one heater hose with the heat control on hot, and see if you can get any air out of it.
Also, check your water pump. Squeeze your rad hose as tight as you can for a bit. When you release it, you should feel a surge of coolant go through it.
Check your heat control valve to see that it's working.

Posted on Nov 15, 2009

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