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no coolant flowing to the heater core

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1990AWD

Supporting VIP
8,540
22
Apr 27, 2009
Langham, SK_Canada
What would cause there to be no coolant flowing through the lines into the heater core? Also, what is the cap on the line for?
 
Pics would be great but from the sound of it the heater core or the houses going to it could be clogged take them off and make sure the passage is clear. Get it fixed its getting cold :thumb:
 
could be air lock to. If so warm it up with the rad cap off while squeezing the hose or loosen off hoses to let air out.
 
I'll get pictures tomorrow of the cap I'm talking about.

Well I had to take the blower motor and evaporator out and clean it of mouse crap and I was going to take the heater core out but gave up. When I went to put the hoses back on, I put one hose on, and was going to wait until coolant flowed through the heater core before I would put the hose back on, but nothing was flowing through either coolant line.
 
you sure you have them on right? some have a check valve which will only let coolant flow in one way. Could be that your low on coolant.
 
you sure you have them on right? some have a check valve which will only let coolant flow in one way. Could be that your low on coolant.

I'll have to check if they are on the right orentation. Would you know? And my coolant is completely full.
 
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