1999 Acura Integra fan problem

SNAKEYES3602003

MEMBER
1999 ACURA INTEGRA
4 CYL
FWD
MANUAL
114,000 MILES

Got a 99 integra gsr, the temp sits just below the middle, only a little bit tho, so I changed the thermostat. Found out that it was at the right temp, that is where gsr's temprature is suppose to be, well while doing this I realized my fans never run. Used my multimeter and found out the wire leading to the fan switch gets 12v so I jumped the wires and the fans ran. So you would think it has to be the fan switch right? I found out I was wrong, I put a new one on(cant get down there to do continuity test) and it did not fix the problem. Took that one back and tried a new one, also still nothing. So I went to a junk yard and bought a wire to connect to it(25 cents) and spliced the wire, hooked it and did continuity test, needless to say nothing. So why is my brand new fan switch not getting hot enought to turn fans on. Again brand new thermostat and radiator(got hole in it) the car could sit for an hour and not run fans(never tried figure of speech) is it maybe just because its cold out. Hopefully you can help no one else even tries because I have done all the things they would suggest.

6 Replies

ZACKMAN

MECHANIC
4,202 POSTS

Did you happen to check the 3 fuses and 2 relays?

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Sunday, February 1st, 2009 AT 2:45 AM

SNAKEYES3602003

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4 POSTS

Yes I replaced the fan relay, all the fuses are good, and I am getting 12v TO the fan switch, my fan switch just does not have continuity to send 12v back to the fans. If a fuse or relay was bad I would not be getting 12v to the fan switch(the switch that needs to be a certian temp before the switch opens). And if I run a jumper wire on the wire that connects to the switch the fans run, so it has to be this darn fan switch not getting hot enough for some reason.

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Sunday, February 1st, 2009 AT 8:37 AM

KHLOW2008

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41,815 POSTS

Hi,

Did you replace the switch with the correct type? There are various ratings of thermo switches available.

The engine normally takes between 20 to 30 mins of running to get to operating temperature for the fan switches to work.

Do you have any high temperature reading if you run it longer?
Any coolant losses?
Was bleeding done after replacement of thermostat and thermo switch?

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Sunday, February 1st, 2009 AT 9:22 AM

SNAKEYES3602003

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4 POSTS

No coolant loss, I already went through pain staking tests for hours on all that stuff. Perfect compression in cylinders and no loss of antifreeze or oil, and no mixing rules out head gasket, and water pump is not leaking and radiator is brand new. I did burp the system, and I used an oem switch for it. I am wondering if it is just because it is cold out. It seems weird tho I have never had a car not run its fans at least occasionally even in winter. The temp gauge NEVER goes above slightly below the half way mark(again that is the riight temp) this thing makes me mad I just dont understand the problem. Thank you for keep trying tho, please keep giving me some suggestions, I appreciate the help.

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Sunday, February 1st, 2009 AT 12:18 PM

KHLOW2008

MECHANIC
41,815 POSTS

Ok, you have everything covered and the cold weather might be a factor here.
The idling is not generating too much heat into the cooling system and the external cold is sufficient to cool the coolant in the radiator resulting in the fans not working.

I would suggest a simple test to find out if the fans would work by increasing the temperature. Start engine and let it reach operating temperature. Should take about 10 to 15 mins. Rev engine to 3,000 rpm and hold till any of the following occurs:
1. Fan starts working
2. Temperature gauge goes up to more than 3/4.

Let me know the results.