<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 10seconds &raquo;</TD></TR><TR><TD CLASS="quote">My overheating problem came back lastnight. We couldnt get the fans to come on. We tested the fan and it works fine. I read that low coolant level could cause the fan to not come on.

So today I added more water. Let it idle for a while and the fan came back on and overheating went away. When it gets cooler outside, im going to drain the coolant in it now and replace with 50/50. It is mostly water in it now. Which im thinking is evaporating causing the coolant to go low. If it starts to go low again after the 50/50 I will be forced to do the compression test to see if it a headgasket.

Is your coolant low? Also been reading that a headgasket starting to go bad might not show the white smoke or other symptoms until it gets worse....</TD></TR></TABLE>

Definetly get coolant back in there ASAP. The coolant will evaporate but more importantly it acts as a lubricant and rust inhibitor for cooling system parts, IE radiator and water pump. Those parts can fail/corrode without coolant. Water is a better conductor of heat, but coolant is a must.

Dan

 

bled my cooling system tonight and there was a good deal of air in it

took her out onto the highway and it overheated a little bit but not nearly as much as it has been

it was also alot cooler today

if it is the HG its not bad enough to produdce smoke but like someone stated above it could be letting air in and overheating me

also could be my radiator

not sure if its too small or not
its a single core

would a built motor run hotter then stock? i have a smaller turbo set up on there at the moment from last year so im not sure what to take a look at

 

bumpity

 

anyone

leaning towards the rad now cause when its cooler it doenst do it as bad

 

have you done a compression test? to see if you have any leaks on gasket?

 

Is it spitting coolant into your overflow when it overheats? Thats a sign of a pressurized coolant system.

 

yea the overflow level moves up and down

 

illestrolla247, did you find the source of the problem and were you able to fix it?

For the last few weeks, my 1989 Civic had the exact symptoms you described.

The temperature used to be completely steady; however, a few months ago I noticed a very slight rise when I'm cruising at high (for a stock Civic DX) speeds on the highway. I would back to the speed limit and it'd be fine. Recently, anytime I'm cruising on the highway for more than say 10 miles, the temperature starts to go up. I'd turn up the heater until I can find a place to pull off and let it cool down.

I've verified there are no leaks, verified electric fan operates, checked timing, replaced the thermostat, flushed/bled the coolant, and am running out of ideas. Surely the water pump is pumping if it's turning, right?

I'd greatly appreciate any insights.