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Not getting heat,blower works fine!?! Help??
#765531 September 14th 2020 1:52 pm
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Hi all.Ace here.I have an '88 Vandura 2500, the blower works fine, im just not getting heat!?!? Any suggestions are greatly appreciated!! Im praying its not a core issue?? But id like to start by process of elimination to save $$!! Thanks again!!


Excuse me...yer ballz are showing!!
Re: Not getting heat,blower works fine!?! Help??
Ace_Vandura88 #765547 September 14th 2020 11:36 pm
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Could be thermostat. Heater core could also be bypassed. What’s your temp gauge read?

Re: Not getting heat,blower works fine!?! Help??
Ace_Vandura88 #765548 September 15th 2020 2:24 pm
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The blend door might not be swinging properly, to force air through heater core.

Not sure if chevy uses vaccuum operated valve to stop/allow coolant flow to heater core, but there is likely either mechanical or vaccuum valve on the heater hose plumbing somewhere. Look at rockauto of heater valve under the heat airconditioning section as to what it looks like.

I just had to change heater hoses on my Dodge, the old valve was partially occluded. I left the valve off for now and plugged the vaccuum line to it, whilst I wait for new valve to arrive.

I flushed and backflushed the heater core. I did so about a year ago too and much more crap came out last year but some did come out this time too. last years flush I got 25f more degrees at output vents, did not bother collecting data this years flush.


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