I've been trying to determine why I have no heater.
I noticed that if I drove at highway speeds I would get just the slightest bit of heat out of the vents.
After reads some posts, I figured that it must be the auxiliary heater pump.
I replaces it and went for a drive.
No luck. There is still no heat from the vents.

I did not touch the pump while I had the motor running to feel if it was actually working, but does anyone have an idea of what I should do next?
-C

 

If you are sure that the heater pump and valve assy are working correctly, then the core might be clogged??

Here is a TSB we got a few decades ago. I have done a heater matrix 'flush' on a few cars with good results.

I just pull the hoses off the heater core and get some clear poly hose that fits tight on the connectors.
Blow some air through to clear the core. Add some flushing solution and let it sit overnite.
Flush it out and try the heater again??

bob

 

You can tap on the heater valve which is a water valve solenoid near the pump that can be stuck closed

Fuses / researching

5 square box is a power point and not a fuse that is hot at all times

49 double dash circle is ......looking and can't find it yet

If you put your finger on the heater pump relay do you feel it clicking ? see the square blue box in the pic below

note the # 15 fuse