hey PO
so my car is overheating. i know u guys probably heard this alot but idk what to do. i already changed the thermostat and check for leaks.
with my old thermostat my fans did not turn on as many have said it wouldnt.
and than me and my friend put in the new thermostat and we let it run for a good time and it seem fine! fan turn on and everything, than the next day i drove it to work (and my work place is only like 5-8min away) and before i know it it was over heating again.!! ARGH so idk what to check now.
anything advice would help
thanks
when did it start overheating? did anything change?
is there enough coolant in there? any blockage in the radiator/hoses? leaking any coolant?
when was the last coolant flush?
just finished a swap in septemper, drove fine til now.
no over heating or nothing.
the over heating just started like in mid november. no blockage no leaks . and yes there are enough coolant in there.
also when does the cooling fan come on? i warm it up and when my car warms up to the normal temperature the fan does not come on. i been told that it should come on.
however if i turn on ac both fan comes on
i'd probably say maybe a head gasket...that or maybe try changing your coolant temp sensor... if youre above 30mph you're fans won't turn on..and if its overheating as you're driving i would assume a head gasket problem. my hatch did the same thing... didn't really show symptoms of having a bad head gasket until it started overheating as i was driving it... when i checked the oil level it didn't look milky or anything but once i took off the valve cover off you could see the milky coolant/oil mix...is it smoking at all???
it could be a relay or something controlling the cooling fan, but once you start moving, enough air is moving through the radiator where it shouldn't matter if fans are on or not.
If the fans aren't coming on then it is probably sensor related, there is a thermoswitch on that cast piece that the upper radiator hose connects to and another on the backside of the thermostat housing which controls fan cycling. Doubt it's headgasket related as you'd be burning your coolant causing you to over heat. Another thing to check would be the fans themselves, get a helms and start diag'ing.
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New Formula Red 93 BB2: JDM OBD1 H22a/T2W4 Accord Euro R transmission
ok thanks for the replys everyone, i think its the fans . cause it overheat when im coming to a stop or slowing down. like it was mentioned above if i am moving at a higher speed there will be air moving through the radiator and make it cooler. so i'll check the relays and the fans.
If the fans aren't coming on then it is probably sensor related, there is a thermoswitch on that cast piece that the upper radiator hose connects to and another on the backside of the thermostat housing which controls fan cycling. Doubt it's headgasket related as you'd be burning your coolant causing you to over heat. Another thing to check would be the fans themselves, get a helms and start diag'ing.
Re-read my post, already told you exactly where they are, they will have green plugs.
thanks so i found the two sensor you were talkin about.
i switch the one in the back and the fan seems to kick in more. but the fan seems to come on too late. it comes on and than the temperature goes up than when the fan stop the temperature goes down.
so i think the fans are coming on too late
im gonna try the sensor in the front to see if they were both out.
Last edited by preludeh2394; 12-06-2010 at 04:38 PM.
if you switched the wires, the fan may be pulling heat from the engine bay and pushing it into the radiator....that's the only thing that would make sense in this case....
if the fans come on in that way, then it could be a short or something....
if you switched the wires, the fan may be pulling heat from the engine bay and pushing it into the radiator....that's the only thing that would make sense in this case....
if the fans come on in that way, then it could be a short or something....
switch wires?
and yeah i change the relay. and i bought a new sensor for the back where the thermostat is.
im gonna change the front sensor to see if it has any affect on it
no, no. the only thing that would make sense in your situation (fans come on, it overheats, they turn off, it cools down) is if the fans were running backwards, but that just doesn't add up.
Since it's DC and not AC, you can just switch the wires and they will run the opposite direction (in theory)
BUT, what spoils this theory is that it did not overheat before, why would it suddenly start?
No he said before that when he's moving the car doesn't overheat but when he comes to a stop the temp rises from not having fans. I doubt that it's possible to make the fans run in the other direction, there's no need for them ever to do that.
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New Formula Red 93 BB2: JDM OBD1 H22a/T2W4 Accord Euro R transmission
thanks minilogoguy18 i think it was the front sensor's fault.
i have been driving it for two days now to and from work and around town for a bit and it hasnt over heat.
so that might have fixed it.
thanks to everyone who offered their advice too.
if it happens again i'll come back and let u guys know
I doubt that it's possible to make the fans run in the other direction, there's no need for them ever to do that.
I'm sure it is possible. What do you think happens when you reverse polarity on a 12V fan?
Quote:
Originally Posted by preludeh2394
if it happens again i'll come back and let u guys know
If it happens again, turn on your air conditioning before your car overheats too much. Turning the a/c on will make the fans run, preventing possible engine damage and keeping you from getting stranded.
I'm sure it is possible. What do you think happens when you reverse polarity on a 12V fan?
If it happens again, turn on your air conditioning before your car overheats too much. Turning the a/c on will make the fans run, preventing possible engine damage and keeping you from getting stranded.
yeah thanks.
at first i been just full blasting the heater, but now i will do the ac instead.
hey again everyone, i been waiting for money in order to service my overheating problems so this is the update.
i finally got enough money to get a water pump job done.
however its STILL OVER HEATING.
i replaced the two sensor: the one on the thermostate from kragen
and the one on the front where the first hose from the radiator goes to from the junkyard. (could be that since the sensor was from junkyard)
i also got the air bubbles out by turning the car on with the rad cap off. turn heater to full blast and squeeze the two hoses to help get the air out. and today as i did that i saw the coolant level rise from the radiator and out the cap?
does anyone know what that mean ?
Buy this and put in on your radiator, it helps with bleeding the system, I use it at work all the time.
Lisle LI24610 - Lisle Spill-Free Coolant Funnels - Overview - SummitRacing.com
Let the fans cycle a few times with this on the radiator, if you still see bubbles after about 45mins your headgasket is blown, If your system has contaminated coolant or WATER the fins on your waterpump are probaly non-existant and your coolant is not circulating.
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