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Author Topic: sort of overheating.  (Read 4701 times)

naptime

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sort of overheating.
« on: August 10, 2011, 06:55:00 AM »

here is another for ya.


my 91 non turbo automatic has started overheating recently. sort of..


as i drive, the tempurature at the dash slowly climbs. until just at the point of redlining.

if i highway drive it stays down about 10 degrees from redline. but city driving after about a half hour and it's up there.

when i park, i can hear it bubbling in the overflow tank. but its not hot enough to boil over, or steam coming out.


my first thought was thermostat, as was my mechanic.

russ asked if i had checked the fan? is the fan running when the car is hot?

he told me to unplug the fan from the temp sensor and see if it comes on.

so, while working on the distro, i did that.. unplugged from the temp sensor.. no fan.

drove yesterday, car got hot, like normal. turned the car off. no fan.


so.. i dont remember, what is my next step? how do i know if its the fan or the fan relay or the temp sensor, etc...

is there an easy or cheap way to test any of the above without just going and buying part after part hoping to fix it?

Gostlrs

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sort of overheating.
« Reply #1 on: August 10, 2011, 03:03:00 PM »

If you unplug the correct connector & the fan does not turn on then it is either the relay or the fan.

You can bypass the relay to check the far. Or just run the positive & negative from the battery to test the fan. Odds are one of them are bad because when you disconnect the switch the fan should be always on.
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Rocketman

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sort of overheating.
« Reply #2 on: August 11, 2011, 12:58:00 AM »

The fan switch is in the thermostat housing, facing straight out toward the driverside. It has a black single wire connector, it's a spade style terminal.

Key in the RUN position, unplug this switch. If the fan does not immediately activate, there's something wrong. CHECK ALL YOUR FUSES FIRST.

Then start troubleshooting from there.
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naptime

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sort of overheating.
« Reply #3 on: August 11, 2011, 07:49:00 PM »

thanks guys.

yeah, russ told me what to unplug.

i did. with the key on, and even with the car running just to be sure.

unplug the wire from the thermostat housing, still no fan.

i'll start with fuses. then i'll run direct power to the fan.

Gostlrs

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sort of overheating.
« Reply #4 on: August 12, 2011, 12:22:00 PM »

I have seen the relay go bad in 3 different cars, I jumpered mine & the ones i looked at. Here in Az i felt better knowing when i turned the key I could hear the fans turning on.
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naptime

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sort of overheating.
« Reply #5 on: August 12, 2011, 04:40:00 PM »

where is the relay located for the fan?

i see a lot when i look under the hood.

thanks  

Gostlrs

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sort of overheating.
« Reply #6 on: August 12, 2011, 06:29:00 PM »

Drivers side, bolted next to the radiator, normally has a black boot over it. near headlight...hope that helps, no car to go take a photo on
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naptime

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sort of overheating.
« Reply #7 on: August 13, 2011, 12:32:00 PM »

relay is bad.

can't find one locally.

sent you a pm about bypassing / jumpering.

thanks  

naptime

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sort of overheating.
« Reply #8 on: August 14, 2011, 12:15:00 PM »

anyone know what wires to jumper to bypass the relay?

luvit

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sort of overheating.
« Reply #9 on: August 18, 2011, 06:35:00 AM »

hey,
to initially test my fan, i disconnected the fan from the relay and extended some wires from the battery to the fan. after i determined the fan worked, then i troubleshot further.

i've been through this. my problem was a wet or greasy connection to the thermostat housing.

but i also learned the following to test the fan even if it's not warmed-up, yet.

- the fan will not run with the key off, so always have the engine running, like for the A/C test, listed below.

- with the engine started, turn on the interior vent fan and turn-on your air conditioner.. the fan runs 100% of the time with A/C on.

- disconnect the wire from the thermostat housing (which you did)

- disconnect the A/C relay to engage the fan. this relay is under the hood in the driver's side corner near firewall & strut mount. it's covered under a black rubber shroud.

- Gostlrs was correct about the location of the fan relay near the driver side radiator.

hope this helps.
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