Hi there, not sure if his is related, I am the owner of a blue 93 Sunbird and took the car to Canadian Tire in Dartmouth NS on Jan 9/04 exact same issue you noted here, are you a tech talking about my car or looking for personal use, anyway, I have replaced the heater core 2 times in the last week, the dealer shop told me the Cn Tire one was not good, they were wrong, at this point I have some fool that spent according to him 11 hours working on my car only doing the same exact tests I told them I already paid for or Jan 12 when I picked the car up...Forbes Cev in Dartmouth says they want me to pay $947.01 for telling me they don't know what the problem is, as you can imagine I am enraged, I mean how could I spend a thousand bucks to diagnose nothing but a "we don't know what it is" andespecially since I gave a detailed history of the work already done. Can you possibly shed any light on this situation
things done at can tire Jan 2/04 antifreeze flush and fill
Jan 9-12/04 test for hydrocarbons in antifreeze (71 in fluid & 81 open air, usually a head gasket will give about 1000 or more on this test) no oil in antifreeze no antifreeze in the oil no white antifreeze residue on spark plugs
new heater core thermostat take water pump out inspect and replace flushed system twice again
Forbes chev Jan 21-22/04 (after I told them about what was done already at CT only a couple of days ago...) forward flush reverse flush heater core replace CT heater core install GM core test CT heater core (no issues) replace CT core and remove GM core flusehed system again took water pump out, inspected and re-installed
Still no ideas, only that air might be getting in somewhere...