Ok well i bought a 95 integra with only 94,xxx miles on it and it had a cracked radiator and a fan blade that had spun off the motor. After replacing both parts and driving the car i noticed that it would start to over heat at stop lights and traffic. I then replaced the thermostat and still nothing. Still over heating so i replaced the water pump because when im at a stop light i can rev the motor up to about 1500 rpm and it will keep the temp down. So thinking that i had fixed the problem once and for all i noticed it would still overheat. The only thing that i can think it might be is either the radiator cap or a temp sensor goin out. Anyway if anyone knows what the problem is here and can please help it would be great.

 

Are the rad fans engaging when it gets hot? (Note: they should also come on when the A/C is running) Is it possible the old owner overheated it and cooked the head gasket (or worse)? Just a couple ideas...

 

Fans are working fine and thers no water in the oil so i dont think the head gasket is blown.

 

Pull the rad cap and let it idle (engine cool preferably!). Check for excess bubbling and gurgling of the coolant. If it burps and shoots coolant alot then you may have a head gasket issue. The coolant should be flowing smoothly past the rad neck and gradually rise and flow over the top. If you've got a geyser, you've got a problem!

 

The only thing that I can think of that you might try, is to wire your fan to a toggle switch so it will be running all the time. That my be a simple way to fix it. IDK but good luck

 

hey also check your thermostat, simplest way i check mines is let my car warm up for about 5 minutes and then check the lower radiator hose. if it doesnt start getting warm, then that means your water is circulating and you'll have to replace the thermostat.

 

He said he replaced the thermostat, but he could of gotten a bad one. Also make sure it was facing the right direction in the housing.

If you have a bleeder screw on the front of the head, use it to get the air out of the system. If not, then do what the previous poster said about pulling the radiator cap and bleeding the system that way.

Remember, if you have a pin-hole sized leak in any hose, even one under your intake manifold where you can't see it, and it bleeds off enough coolant, it will cause your car to overheat. Good luck finding a solution to your problem.

One more thing, when I had a small leak, and it caused enough coolant to escape, the car would overheat like yours, but when I revved it, like you, the temp would come down. That is because the water pump is shooting the water up into the head where coolant should be flowing, but isn't because the level is too low.

 

From my experience, just b/c you don't have coolant in your oil doesn't mean you don't have a blown HG. I honestly don't know too many people who have had blown HG's, that had coolant in their oil. The only true way to is to have the coolant tested for hydrocarbons at a local rad shop or buy what NAPA calls a block tester. HAve you pressure tested the rad cap and the cooling system? Are you ever missing any coolant?