I just bought a very nice 90 Park Avenue. The problem that I am having is that I noticed last night that I was not getting any heat from the blower when I turned it on even though I raised the thermostat all the way to 90 degrees. The control on the dash seems to be working correctly. Any ideas as to what may be causing this problem?

Is the blower fan on at all?

Is the blower fan on at all?

:banghead: Yes. the climate control system is functioning well. The blower is working at all speeds. I just purchased a new thermostat and will be installing as someone else though that the old one may be stuck in the open position and not allowing the coolant temperature to rise properly. If this does not owrk I am going to back flush the heater core as it possibly may be clogged in some way. Any other thoughts as to what may cause this?

Thank you for your input,

Glenn Degere

Ok, so long as all the directionals for the vents are doing their job and the fan runs, maybe a heater core, you could run the car a bit, and feel the hoses going to and from the core. One should be hot, and the other relatively close to the same. Obviously if one going in is hot and other is not at all, the core is clogged, and normally flushing may not be a cure. If the temp is somewhat close, it may be possible to flush. If none of the hoses (especially the upper going to the radiator) are hot then you might have a thermostat problem or water pump. i'm assuming this is one of the digital climate control systems?

Ok, so long as all the directionals for the vents are doing their job and the fan runs, maybe a heater core, you could run the car a bit, and feel the hoses going to and from the core. One should be hot, and the other relatively close to the same. Obviously if one going in is hot and other is not at all, the core is clogged, and normally flushing may not be a cure. If the temp is somewhat close, it may be possible to flush. If none of the hoses (especially the upper going to the radiator) are hot then you might have a thermostat problem or water pump. i'm assuming this is one of the digital climate control systems?

Your correct in assuming that this is a digital control. I was wondering if it might be an issue with a lack of vacuum?