1994 honda accord 4 cylinder
it hasnt overheated cause i havent let it...seems to get very warm so i turn on the heat and comes back down its seems to be when i'm sitting in traffic if im moving temp comes back down with no problem ...new radiator and new water pump in the last 2 years... i opened the hood and noticed that the driver side fan was on but the passenger side fan wasn't...should it be on??

 

The passenger side fan (radiator fan) should be on, and is likely your problem.

Check the fuse for the radiator fan. It is in the engine bay fuse box.

Next, swap the relay for the power windows with the relay for the radiator fan. See if the power windows work. If the power windows do not work, replace that relay. Check that the radiator fan works.

Another way to test the radiator fan is to unplug the green connector on the temperature sensor on the thermostat housing. Make sure the car is turned off. Use a piece of wire to short the two pins on that electrical connector.

Unplug the radiator fan. Start the car. Use a volt meter to see if you have 12V across the two pins to the radiator fan's electrical connector.

 

thought that might be the problem thanks....i changed the relays and i still have power windows so its not the relay...so next guess is that the fan is out?

 

Run some wires from battery directly to fan motor, to verify the motor actually works. If it doesn't then you know what to replace. If it DOES work, come on back for more tests.

Keep your eyes open for broken wiring too.

 

alright i tested the green connector at the thermostat housing....nothing happened looks like i got a dead fan...not shocked with 270,000 miles on the engine....but i got the car for 400 bucks can't argue with that

 

Well, it's likely, but you didn't prove a dead fan motor until you supply 12v to the motor. Did you measure 12v at the fan or did you just jumper the switch & see the fan wasn't running?

 

just jumper the switch

 

When you jumped the switch, lower hose/t-stat, did you have to car on? doesn't have to be running just key in pos II or "on"?

Edit: and BOTH should run during this test.

 

alright i pulled the fan and tested the fan straight from the fan to the battery and the fan started to work....what else should i look at?

 

Does the AC work? If so, turn it on and the blower motor, check to see that BOTH fans run. Do they?
There are more test but lets start here.