I have a new stat in it 170*. Just don't understand why it would blow cold. With winter rapidly approaching sure would like to have it fixed.

Scoty

 

a heater that blows cold air is not a good sign for the engine. The heater that keeps you warm in the winter gets its heat from the coolant that cools off your engine. If there is cold air coming out when you have it set to "hot", then you either have a coolant obstruction in the lines, or a bad water pump, radiator, etc., but more than likely a water pump. Check your coolant level, fill it if you need to, then check over your system for leaks. If you can't find any, then you may want to look in to your heater core, but check your heater control valve as well to make sure it isn't stuck on cold. Hope that helps.

 

check the heater control valve

 

if he had a bad water pump, his whole engine would overheat and he didn't mention that it did. Check the heater control vavle, as stated.

 

I have put in a new radiator (6 mo old). It was working fine before the new radiator. Just to clarify, the rad. has only been in about a month but is about 6 months old. I just put in a new stat. I'm kinda leaning towards the heater core. I did however put in a new heater core last year.

Heater control valve are you talking about the one in the dashboard. When I move the slide control from cold to hot I hear a change in the sound of the air but it doesn't get any warmer.

Scoty

 

There's a valve under the hood on some thirdgens that re-routes the heater water so it doesn't flow thru the heater core when it's not needed. Look for a plastic gizmo with heater hoses (and a vacuum line I believe) going to it.
My car doesn't have one, but I believe it's right above #2 cyl. on cars that do.

Do a search. I know I've seen pics of it on this site.

 

Feel the hoses that go to the heater core--they should be pretty hot when the engine is warmed up. If they aren't, figure out why(like the heater valve)

 

If you are getting hot coolant in your heater hose then this might be your problem. Your a/c and heater vents are controlled by vaccum. when you moved the vent indicator from one destination to the other it removes the vaccum to that vent which in return opens up that passage. But when you turn the temp. switch to heater then it opens a heater hose vaccum line which lets the hot coolant flow to the heater core. Reason for doing that is to keep hot air coming in when the fan is off but the temp. switch is on heat. You wont hear the vac. leak unless the heater is on. Hope this helps. It was my problem thats how i learned whats going on. Im trying to find a jpeg. pic to show you but im not on my comp. right now. Sorry. Its located over a.i.r. pump inbetween the TB and the Evaporative Emissions Canister.

 

Thanks guys I will mess with it some today.
Scoty