Ok guys I had the 203*thermostat in my rig.... the other day ot wouldnt build any heat at all.... the top hose wasnt hot and the water in the resivor was cold..... so I ran to the parts store got a long stem 195* tell I can get another 203*..... changed it all out and it still takes for ever to build heat.... temp gauge never even gets to the n... on normal. .... thanks for any help in advance

 

What were the conditions you were testing in? We're you driving the truck to get it up to temp or idling it? You may not build enough heat at idle in cold ambient temps. Do you still have your old 203 stat? You can boil it to test it..

 

Yes i was driveing and it was about 32 out..... I do have the old one and I did test it.... its stuck open

 

Are you sure that you drove long and hard enough to get the new one to open?

 

Through experience and hearsay, I have seen the parts store ones bad out of the box, both ways. They are either stuck open, or the bad one, don't open well enough.

 

Yeah I drove it for like 45 minutes it always had amazing heat befor.... I know this tstat is a 195*.... while driveing it will get almost to the n on normal than it drops way back down....

 

Man... If its not "overheating" from not opening than I'd suspect a bad stat thats partially open or stuck open.. Course, some experts will come along and debunk my theory..

 

Ok so after an hour of driveing I came home heat is warm but not as hot as it was.....pulled the napa 195 heated up some water and it is opening at 190... so 13 degrees colder might play a big role in my problem