My girls EK overheats on hot days it seems only. Cold days seem fine. There are no mods to the car accept I hooked the radiator fan to come on when the car comes on due to it not coming on ever (relay problem I guess). So the fan runs constantly and she still overheats.

When this happens I tell her to turn the heater on full blast and the temp gauge goes to half way or a little under. I bled the system 2 times, I'm pretty sure there is no air at all. Coolant looks fine, no water shooting out of reseviour either, doesn't boil over, no signs of leaking, I'm stumped.

So the main symptoms are, car overheats on hot days, turn on the heater and goes back to normal or close to normal. Anyone know what this could be? TIA

 

thermostat?

 

maybe ur thermostat is messed up

 

I would bet it's your thermostat. I have a 90 Accord for a daily driver and it started doing the exact same thing. Changed the thermostat, completely flushed the rad/block, refilled, and no more overheating.

 

Your thermostat is sticking closed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiFan &raquo;</TD></TR><TR><TD CLASS="quote">thermostat</TD></TR></TABLE>

 

I had the same problem, changed my thermostat and flushed the cooling system and nothing... as it turned out my radiator was clogged and not letting the proper amount of collant flow... so i bought a PWR Aluminum radiator...

 

for the last time...thermostat.

a good way to check without opening the housing up is feel the lower rad hose. if its cold and the upper is hot, the thermo is dead.

 

good chance it is the thermostat..... and make sure the fan on the radiator turns on

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H.A.R.T B18C1EG6 &raquo;</TD></TR><TR><TD CLASS="quote">good chance it is the thermostat..... and make sure the fan on the radiator turns on</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by technine &raquo;</TD></TR><TR><TD CLASS="quote">I hooked the radiator fan to come on when the car comes on due to it not coming on ever (relay problem I guess). So the fan runs constantly and she still overheats. </TD></TR></TABLE>

 

if i was a betting man id say it was the thermostat

 

The bottom is warm and the upper is hot. Should they be close to the same temp? Or should it be a little colder because of the heat transfer?
I can keep my hand on the bottom forever, but the top will get pretty hot.

 

So what temp should the thermostat open at?

 

depends on the car...

i think full open is 195*F on my civic (i think)

i would first make sure the fan is turning on...
then i would first replace the thermostat (quick and relatively cheap)
then i would take my radiator to a radiator shop to get acid dipped because it is probably clogged...

 

Well, FAN IS ALWAYS ON as stated in the first post.

What about radiator cap? Can this cause this also? If I replace the thermostat, I will also replace the radiator cap as well because both are cheap and easy.

Aslo when I was bleeding the system I put a radiator filler funnel (big neck) and filled it with water to the top, reved the motor and fluid started to fill up the funnel as I reved and dropped back down. Is this normal?

 

yes, radiator cap can also be a problem...

if you noticing the coolant overflow tank being filled and never returning to radiator, then your radiator cap is bad or there is a leak in the hose between radiator and overflow tank.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by technine &raquo;</TD></TR><TR><TD CLASS="quote">The bottom is warm and the upper is hot. Should they be close to the same temp? Or should it be a little colder because of the heat transfer?
I can keep my hand on the bottom forever, but the top will get pretty hot. </TD></TR></TABLE>
the upper should be cooler than the lower. r e p l a c e t h e t h e r m o s t a t e

 

SEARCH!!!!!!!!

under my name....i made a checklist!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">SEARCH!!!!!!!!

under my name....i made a checklist!</TD></TR></TABLE>

Did it under your name, nothing came up!!!!!!

Can you somehow help me Chad?

 

so you changed your thermostat and still have problems?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95DxSi-R2 &raquo;</TD></TR><TR><TD CLASS="quote">
the upper should be cooler than the lower. r e p l a c e t h e t h e r m o s t a t e</TD></TR></TABLE>

Upper cooler?? Is that where the coolant goes into the head and the bottom is the return line?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pgpunkguy &raquo;</TD></TR><TR><TD CLASS="quote">so you changed your thermostat and still have problems?</TD></TR></TABLE>

Sorry, gonna do that this weekend along with the cap. I'll keep you guys updated. Thanks everyone!

 

Changed the thermostat and radiator cap. My girl is driving it for the first time today so we'll see what happens. I also bled the system for 4-5 fan cycles and hooked the fan up the right way (relay seems to be working so no more fan on all the time).

I'll let you know what happens.