SPIKE'S91CIVICSI

Recently bought this vehicle.guy replaced the waterpump.it over heated after a 3 hour drive.i changed the thermostat cause he never did it and also replaced the radiator cap.i noticed wen i turn in ac it goes up and goes back down but then it goes high after a while.it keeps doin it while im at a stop also.wen i rev it it goes down.i dnt see any leaks and fans kick on.as im driving it slowly goes up and down every once in a while.car is stock with no mods.any suggestion?

95accordCE6

Hmm...out of curiosity what brand tstat at did you get? If it's a duralast or other economy part manufacturer it's possible you got a faulty one, best way to test it is to feel the upper and lower rad hoses and make sure they're both warm (an infrared thermometer is even better) or take it out and put it in boiling water to see if it opens, I suggest this only because I have seen tstat issues where revving the car made it cool back off. Also a compression test done at normal operating temp with all the plugs out and tp open...even if it doesn't help solve the issue it's a good thing to know

SPIKE'S91CIVICSI

The thermostat seemed fine to me.wen i press the brakes it seems to make it go hot again.im not sure if the temp sensor is faulty or something but the over flow isnt even full.i have a 3 hour drive right now n i dnt wanna be stranded....

95accordCE6

I understand, and that is a good possibility...especially if the engine itself doesn't seem to be overheating. I've heard of them going straight to being pegged in the red at startup, but as with any electronic device an intermittent issue is very possible. I wish I could be more helpful, but luckily the sensors are cheap enough to give a shot

SPIKE'S91CIVICSI

Yea i would tought if it overheats it would shut of and if its on red it wouldnt crank also.this car is being a head ache and i jus bought it.thanks any way!

nicknack25

Sounds like your fan isn't kicking on. Could be your Engine Coolant Temperature Switch, could be a bad fan motor, or maybe you have air in your coolant. This site could help

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/engine-coolant-temp-ect-sensor-questions-2571707/

First you should make sure if they kick on or not on their own.

fcm

Ditto the above^^^

Make sure rad fan turns on, should turn on when temp. gauge is at about the 1/2 way point.

Also bleed the coolant system to make sure there is no air in it. 94

SPIKE'S91CIVICSI

Fans kick on.im kinda thinking its a sensor.ima swap them and see wat happens...

nicknack25

How did you determine that it turns on? If they do, then try bleeding your coolant correctly.

SPIKE'S91CIVICSI

Welp i seen them turn with my own eyes.i think it good to go.i changed out the temp sensor and it doesnt get hot.plus there is no bleeder valve so there was no way of bleeding...

EnjoyTheRideDC2

iTrader: (1)

You dont need a bleeder valve to bleed the air out of the cooling system. With the car cold, remove the radiator cap, start your engine and let it idle. Turn on your heater full blast and let the car warm up to operating temperature. Add water if needed.

There's probably a more in-depth explanation of how to do it on this site. Run a search for it.

evan221

x2 bleed the system

95accordCE6

Holding the idle at 1500rpm during bleeding makes the process a little faster, then let idle and bleed...especially if you encounter idle surge from the air in the cooling system

SPIKE'S91CIVICSI

Problem fixed! Changed temp sensor.thanks guys for advice!

SPIKE'S91CIVICSI

It came back again only once.i bleed the system and fans never kicked on and after 15-20 min it started gushing anti freeze out so i gave up for now.

nicknack25

Well there's your problem sir. Your fan doesn't turn on.

SPIKE'S91CIVICSI

It does when its driving n also when it over heats.***** a complicated issue i rather be wrking on my ef...

SPIKE'S91CIVICSI

Any sensors yall recommend swapping out.i have another integra laying n my garage...