Well I just recently replaced the coolant in my car. I used Premixed 50/50. The car warms up fine when it is idling. I would rev it up and it would heat up to operating temperature. But as soon as i hit the road the engfine temp guage drops down to as though it wasn't even warmed up. Can anyone think of anything that may resolve this problem? I have never encountered this problem before and im starting to think its the mixture of the coolant that is the problem. Anyways if you have an idea of what it could be write me back... thediricos@hotmail.com it would be greatly appreciated.

Thanks

pascal

 

It's still got some air in the system, or you have a bad thermostat that's stuck open.