Blowing Cold Air

[ricotubbs]

I have a 1987 Olds Delta 88, that blows cold air. Both heater hoses are hot leading into the heater core and all my ducts and vents are working ok. I dont trust my electronic tempeture device no matter what i set the temp at it still blows the same. I also read some place that if the car sits at idle too long the outside tempeture sensor will force it to blow cool air, however my car seems to be doing just the opposite when the car sits idling the temp starts to blow warmer air (but not close to waht its suppose to). Short of ripping apart the heater core and manually opening the heater exchange valve until summer is there any way of checking?

[maxwedge]

Welcome to AF. Assuming the heater core is not blocked and the circulation to the core is ok, the automatic programming system could be faulty, if the air comes out the lower heater ducts as it should, I'd suspect the temperature door as a problem or a circulation issue.

[G.A.S.]

just because of the year of the vehical, I think I would change the thermostat. Hot hoses to some are not as hot as they really should be when the system is working properly.
I just did a 2005 dodge mini van with that same senerio. had to stop the van and get heat to warm the hands. not a lot of heat but enough to be just warm. get driving again and it blew cold air. remover the thermostat goode neck and the thermo. was in peices.
I also agree with max.
A pluged heater core could be the issue.
How did this situation come up? did it just start blowing cold air ? was it a slow and up and coming problem? did you do any work on the car where you could have unpluged a vacume hose by chance?
just some thoughts.