ok.. was fooling round with the heater at work today... vacuum is ok. far as i can tell. need to replace the one vac line that goes from manifold to firewall tho. but switches appear to work... any way to check this door without dismantling the dash? the cable works jsut fine but cant tell if any door is opening. the cable operates a vacuum switch. still at a loss. at this point im ready to try dismantling the entire thing to figure it out... its coooold!!!! did findout one thing tho.. the heater hoses going to the heater core. one is way warmer than the other.. that make a difference??
Sounds like the heater core is pluged. might want to try to swap the heater hoses around. Reversing the coolant flow thru the core MAY unblock the core. It's a cheep trick to try. But sounds like it maybe time to replace the core. Russ
CRIKIES... i was afraid of that.. actually had that thought today. but was afraid to voice it.. if i try reversing the flow.. would that cause problems if whatever is cloggging it came loose??? its not a problem to flush the system for me.. (i do manage an oil change shop after all) but i dont want something killing m water pump... it looks almost original.. lol pretty ancient anyways
