1998 S-10 ext cab V6, I notice two weeks ago, I had no heat in my truck, so
I changed the thermostat, and checked the fuses, still no heat. I took the
heat and air control panel out of the dashboard, the vacuum was fine in the
control switch.
To keep from paying the Dealer 70.00 bucks just to look at it with a 500.00
bill to take out the heater core. I decided to unhook the two hose's to the
heater core , at the engine compartment, and use my air compressor on 20 psi
and blow through the heater core and see if there is a complete loop. I did
this and antifreeze and gunk come out the other end of the heater core. Now
I have heat again. I don't know if this caused another problem later,but I
have heat.