How come my car overheats only when im driving about 80-90mph. I have a b16 tranny so rpm is about 4600-4800. What's wierd is when i had my single slam in there, it would overheat at that speed also. Could it be the radiator? Headgasket? Also I just replaced thermostat and yes theres no bubbles in there. Fins on the radiator are still straight and cleaned out. There's no oil in my coolant or coolant in my oil.

 

bump before bed

 

check the coolant temp switch and plug, replace your gauge cluster with a new one.

wire an aftermarket gauge cluster

bleed your coolant system

have you bothered to do any trouble shooting at all?

 

make sure fan is on when temp is HOT

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4sd4dr &raquo;</TD></TR><TR><TD CLASS="quote">check the coolant temp switch and plug, replace your gauge cluster with a new one.

wire an aftermarket gauge cluster

bleed your coolant system

have you bothered to do any trouble shooting at all?</TD></TR></TABLE> that's the thing, i don't know where to start troubleshooting. I already changed the thermostat and the coolant. This is how i did the bleeding. Turn car on, heater on full blast, radiator cap off, put coolant when needed, wait for fan to turn on two times then top it off and put cap back on. I made sure both bottom and top hoses were hot. I will try a different cluster next. Also take note that all i needed to do to bring the temp back to normal was coast in 5th gear going downhill and it will go back.

 

come to think about it, do you think the head could be liftingbecause when i am coasting in 5th gear downhill isn't that causing vacumm in the cylinders causing it to suck the head back down making it seal and go back to normal?

 

?

 

Are you using an oem honda thermostat or a junk aftermarket thermostat?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PURPLETERROR aka BIGMATT &raquo;</TD></TR><TR><TD CLASS="quote">Are you using an oem honda thermostat or a junk aftermarket thermostat?</TD></TR></TABLE> oem

 

ttt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by faSHOwidIT &raquo;</TD></TR><TR><TD CLASS="quote">come to think about it, do you think the head could be liftingbecause when i am coasting in 5th gear downhill isn't that causing vacumm in the cylinders causing it to suck the head back down making it seal and go back to normal?</TD></TR></TABLE>

NO

pressure test your rad cap. if thats ok..pressure test you complete cooling system. I had the same problem a long time ago. Turn out to be my rad. It wasn't holding pressure.