christiian

My 95 civic starts to Overheat when I turn on the A/C
But if I have it off the temp stays low even if I drive all day.
Its NOT my water pump
Its NOT the fan {fan is on all the time}
So can some one help me

philosofy1

thermostat, try replacing it. it's pretty cheap to. about $10 for a decent one.

christiian

dont have a thermostat in it

luelf21

no thermostat? So your water pump just stays on all the time no matter what? Your water pump is a positive displacement pump man, which means its only on under certain conditions. Conditions such your thermostat reads that your engine is warm and need coolant pumped through it. Im not saying that its your thermostat that is causing the problem, but i think you have a thermostat. If not thats cool, im just simply saying..... Anyway, i think you need to check your coolant levels. If your water pumps good and thermostat is good and your fan is working, then it is likely low coolant. Throw some water in it and it should take care of the problem. The reason for the overheating with the a/c is because it is causeing your engine to work a bit harder and that little extra work is probably pushing your motor over the line and causes it to everheat.

christiian

coolant levels is good still

Wannabe JDM

get a thermo. its cheap enough.

luelf21

Have you swapped fans or anything before the overheating problem started?

luelf21

also, i just realized that if you dont have a thermostat your car shouldnt overheat. If you dont have a thermostat then you dont, so its not the problem.

Banned HT Member

No thermostat can sometimes cause a car to overheat. When you remove the t-stat it allows the coolant to flow too fast between the engine and the rad, not allowing proper cooling. The hot coolant just keeps recirculating without enough time to cool down. Try putting in a t-stat or some kind of restrictor to slow that coolant flow down.

RedEj8

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Banned in D.C. &raquo;</TD></TR><TR><TD CLASS="quote">No thermostat can sometimes cause a car to overheat. When you remove the t-stat it allows the coolant to flow too fast between the engine and the rad, not allowing proper cooling. The hot coolant just keeps recirculating without enough time to cool down. Try putting in a t-stat or some kind of restrictor to slow that coolant flow down.</TD></TR></TABLE>

Get a thermostat from honda.

christiian

no its still not working overheating

philosofy1

did you replace the thermostat? if so it seems this problem has been popping up lately. did you burb the system, you know let the air out. when you work on you cooling system and add antifreeze you need to let the air out. if not it'll continue to overheat. if that still doesn't work try replacing your radiator cap. anything else will cause a leak and a leak is pretty easy to find.

christiian

There is no air in the system. Antifreeze level good, radiator cap is good
BUT one thing i was testing the radiator heat level and the top was 200F and the bottom was 150F. Is that good or bad

P.S when I drive over 4grand that’s when it starts to overheat until I stop at a light it goes back down.

jdm_sir2

Dude go to Autozone and buy the Fan Coolant Sensor it that man.... you might think your fan kick on but it doesn't it just fools you.....I have the same symptoms on my car and I check everything from coolant hoses, thermostat, Fuses, Air in coolant system, Radiator cap, Radiator and in the end it was just a sensor that cost me 20 bucks!

philosofy1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by christiian &raquo;</TD></TR><TR><TD CLASS="quote">There is no air in the system. Antifreeze level good, radiator cap is good
BUT one thing i was testing the radiator heat level and the top was 200F and the bottom was 150F. Is that good or bad

P.S when I drive over 4grand that’s when it starts to overheat until I stop at a light it goes back down.
</TD></TR></TABLE>

what i'm trying to say is, you can pour antifreeze into the radiator. it'' fill up, you can close it up and everything., but there is still air in there. open the cap back up and start the car. you'll see the fluid go down. at that time pour more fluid in until you can't no more (while the car is still running), then close it up.
thats how you burb the system.

this is what i'm asking have you done yet.

christiian

i no that but still theres no air in the system

philosofy1

how do you know there is no air in the system, have you done this yet?

civicracer59

What does the rad look like. My eg was doin the same thing. I thought it was ect sensor changed it and it still kept overheatin. Changed thermo, coolant, rad cap, still overheated. Got a used rad and now it runs fine. Must have been clogged or something but try changin rad.

christiian

i think is my water pump not working right u think so