shoota0075
Active Member
on my 97 expo the last time i used my heater (last winter) it worked fine, yesterday morning it got so cool I went to use it and it just blew cold air, i let it run for a good while too ,no change. any ideas? thanks
Heat?
- Thread starter shoota0075
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yammerslammer
Full Access Members
Could be a few things. Thermostat could be bad, heater core could be clogged, or the blender door could be stuck. I would start with the easiest - replace the thermostat. Then again, I dont know much about these Expys and the thermostat might be hard to change...these are just opinions.
fiveohpoepoe
Full Access Members
All the above are the best and easiest starting points. Check the thermostat first and I,d recommend changing it if it has not been. Its not expensive and should be easy to do.
shoota0075
Active Member
thanks guys for the info, but if my thermistate was bad ,wouldnt my truck run hot?
creativemain
Member
start with the thermostat, its cheap like $7 and about 5 min to change
just the 3 bolts, also make sure to get the replacement gasket
just the 3 bolts, also make sure to get the replacement gasket
Racenut
Full Access Members
Not necisarily if the thermostat is stuck OPEN the truck will NOT get up to full operating temp. If the thermostat is stuck closed then it would get hot.
Have you checked to see if the REAR HEAT is working? If it is then you could probably rule out the thermostat and jump to the blend door or a pluged heater core.
Last edited:
shoota0075
Active Member
ok, i will check the thermistate 1st and yes cold air is coming out the back too.
Racenut
Full Access Members
If cold air is coming out of the rear as well I would definatley do the thermostat, and you can probably rule out the blend door because it is not an isolated problem to one zone or the other and both zones have blend doors.
It could be plugged heater cores thou, after you change the thermostat fill it with water and run a good cleaner like the prestone cleaner through the sytem and flush it really good after then top off with antifreeze.
joedmti
Member
Did u fix it?
Shoota,
How you making out?
After days of fun and games, t-stat replaces, rear core replacement, flushes and stuff, could not get heat from dash or from rear zone, (99 XLT)
Mechanic says that my top and bottom radiator hoses were not getting hot enuff. He had some sort of hand-held, laser emitting LED thermometer, he just pointed the light on to the hose, and got the temp.
He said it was my water pump. I thought he was nuts, but had exhausted all other possibilities., so he replaced pump, problem solved.
The impellers on the pump were worn off, causing low temp.
Go figure.
Shoota,
How you making out?
After days of fun and games, t-stat replaces, rear core replacement, flushes and stuff, could not get heat from dash or from rear zone, (99 XLT)
Mechanic says that my top and bottom radiator hoses were not getting hot enuff. He had some sort of hand-held, laser emitting LED thermometer, he just pointed the light on to the hose, and got the temp.
He said it was my water pump. I thought he was nuts, but had exhausted all other possibilities., so he replaced pump, problem solved.
The impellers on the pump were worn off, causing low temp.
Go figure.
shoota0075
Active Member
it was my thermistate, i changed it and it started blowing hot heat, thanks for the help all
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