ill get my truck to opearting tempature and shut it off run into the store come out restart it and the temp is about 100 whats up with that

 

Umm....your engine cools off when you leave it sit for a certain amount of time. Usually its like 30 minutes, but it always depends on the temp out side. I cant imagine there is anything wrong with your blazer if it cools down too fast.

 

it cools in like 5 mins.from say 190 to 100 i think somethings wrong somewhere

 

Yea but sit down and think about what you are saying. How is there somthing wrong with your engine if it cools down too fast when you shut it off. That should be a good thing in somes ways.

 

check your coolant level ....your sensor might no be exposed to coolant when you shut it off (tons of air) ???

Does the temp jump back up to normal pretty quick once you start it back up?

 

no i think it might be the gauge.

 

no fear 17 i never said ther where something wrong with my engine.think about what your reading???????????????????uh????????

 

Please remain respectful to one another in your posts.

If you can not add useful advice or information, please do not post.

Have you found any solution yet FImports?

 

Ok, I just got my truck up to operating temp (now I can start the dam thing) and noticed it was 200, then shut it off and checked it 30 mins later and it is reading 150o. I have just changed the coolant and all my temp sensors so I know everything is working ok.

Cooling from 190 to 100 when you shut off for 5 mins means there is something wrong surely??

When you switch a car off at operating temp surely it rises first then starts to cool off, you have no more coolant flowing through the system and I'm sure there is a certain amount of heat-soak back from the engine and block to raise the temp a little? Even if it is just barely, the result may keep the temp stable for a short time then drop off.

I would definently check the coolant level as mellon101 has stated.

I'm no mechanic, but the laws of physics do apply here.

 

nothing yet.sorry bmx17