ls vtec Running hot

[Harold4Dr98]

Ok I just did a ls vtec swap in my 1998 ek civic. When I put water in my car and let it sit the temp hand is fine, but when I drive it the temp hand creeps up and start running hot. It has a new water pump, head gasket, ARP headstuds and its still running hot. Any suggestions?

[r_Senik]

temp sensor? it might be bad and making it read hot.
or is it boiling up into the resivor?

[pworld14]

when was the last time you changed the thermostat?

[*EFilliated*]

a temp sensor doesnt just read hot, either it determines the temp or nothing at all. i would make sure the thermostat is not stuck close, that would cause it to over heat and many other things, is ur radiator fan working. did u properly bleed the system to let any air bubbles out, this would cause it to overheat. start by eliminating possible causes


temp sensor? it might be bad and making it read hot.
or is it boiling up into the resivor?

[Harold4Dr98]

I have not change the thermostat yet. The temp sensor I am using came out of a car that was working good.

[Tech5]

Was the head shaved before installing or did you just slap the head on?
If you did , the head could be warped .....

Is the upper hose building a lot of pressure???

You should do a coolant pressure test

I would remove the thermostat and leave it out and try that if it runs fine and don't get hot then replace with a NEW thermostat .

[Sneezin]

I would remove the thermostat and leave it out and try that if it runs fine and don't get hot then replace with a NEW thermostat . X2

[Harold4Dr98]

Yes the head has been milled and the block was honed. I am going to try to take the thermostat out and see what happened.