one day a week or two ago my heater just stopped blowing hot air, it will only blow out cold air. i cant seem to find the reason why it dosent blow hot air anymore, does anyone have any idea why it would stop or what i should check.

 

Clogged heater core or lines to the heater core. Heater core may have just gone bad. Low on coolant?

 

Check your heater valve as well for operation. If it wont move or open, you won't have any hot air.

 

I 2nd the heater valve. Is it vacuum operated on these motors? I can't remember. If so, check the vacuum line running to it. Without a good vacuum source, it won't pull open.

 

x3 on the valve..especially if it just stopped, and was previousely working fine.

in the engine bay, on the firewall, right on top(ish), is 2 hoses, and one w/a brass fitting that slides...try manually moving it in the opposite direction it is in now, and go for a drive..

 

It is not vacuum operated, its cable operated. You can operate from inside while a buddy watches the lever action, or just disconnect the cable at the valve and operate it yourself.