HAccord96

Hey guys. Recently, the car has been running on the hot side. After turning on the heat (at full power), the temperature gauge will drop back down to normal operating temperature within about 1 minute.

I just replaced the thermostat with an OEM Honda/Acura thermostat (with housing). It is still overheating! The car has 72k miles.

What could be wrong?

Thanks in advance!

1grex

Could have a leak, next step is visual inspection & pressure test

HAccord96

I found the problem. There was a hairline crack in the lower radiator hose. I replaced it and it solved the problem!

roll5104life

was it leaking out of the hair line crack? im having heating problems and can figure it out.

nebraskaimport

the cooling system could be air bound also check the temp. sensor it mite not be letting your fans kick on

miguey310

maybe the radiator may be holding the pressure bad

HAccord96

Yes, and I think it was letting air in when it was leaking the coolant out. Which will account for the low level of coolant and the rough idle.

Targa250R

Even if you have to pay someone else to do it, a pressure test can still save you a ton of money. Proper diagnosis is much better than throwing random parts at it.

That'll do it.

Glad to see you bought an OE thermostat, too. Aftermarket thermostats can often cause more cooling problems than they fix.