We have changed the thermostate, valve cover gasket, and note no leakage from the head gasket. It only overheats when the AC is being used. We have to add coolant/water several times. Is there a connection between the AC and the cooling system?

 

is your radiator fan turning on???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DJ_NeX &raquo;</TD></TR><TR><TD CLASS="quote">is your radiator fan turning on???</TD></TR></TABLE>

Yeah sounds like a fan prob check rad fan and cond fan

 

Or if fans kick on have your rad checked it maybe partially clogged it can happen after 10 years. Mine was clogged when I first bought my civ. They said the civ rad are so small even a 30% blockage can cause overheating.

 

Check the fan relay

 

The fan does turn on, but we haven't checked the radiator...we will try that and see what happens. Thanks!

 

The thing we don't understand is why does it overheat only when the AC is on?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wnadance &raquo;</TD></TR><TR><TD CLASS="quote">The thing we don't understand is why does it overheat only when the AC is on? </TD></TR></TABLE>

Check the condensor fan see if it turns on as well. There's two fans correct? If so turn on the A/C and when the car starts to overheat see if both fans are runnin. If not see which one isn't.

 

Ok, thanks. We will check that out and post the results.