normal running temps? Truck wont warm up

[mpiller]

What is the normal running temp for a 7.3? Lately my truck won't get much above 150* and usually it stays at about 149. I have a vegetable oil conversion on it and I thought maybe this could cause it to warm up slower but even after driving for a long time it still stays right around 150, and this is unloaded, both city and hwy. During the summer it would get to about 165 but this was during 110* heat outside, and now its been around 60-80 so I don't see how it could be too cold. And since it won't warm up I can't run it on vegetable oil. Any ideas??
Thanks

[NoRalPh]

Could your thermostat be stuck in the Open position?

[mpiller]

How could I check this?
Thanks

[NoRalPh]

Really, the only way to be sure would be to take it out and look at it. At that point, you might as well just put a new one back in either case

I'd go get a new one (their not expensive) and put it in, see if it fixed the problem....

[harley1rocker]

Originally Posted by NoRalPh

Could your thermostat be stuck in the Open position?

thats exactly what is going on,take your thermostat out and you will run at that temp...put you a 195 in there i beleive thats what ford calls for on that year

[mpiller]

ok thanks guys I read a few things and it doesn't look like too difficult of a job so I'll replace it this weekend.
Thanks