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Old 08-18-2004, 07:51 PM   #1
dusktilldawn
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Member#: 57766
Join Date: Mar 2004
Location: SW Iowa
Vehicle:
1987 GL Wagon 4WD
The Silver Bullet

Question OE temp switch

Does anybody know what temp the radiator-mounted OE cooling fan temp switch closes at?
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Old 08-19-2004, 04:27 AM   #2
Calebz
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1980 CB400 Hawk
1996 GrandCherokeeLimited

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Don't have my FSM in front of me, but I believe its ~195

and it opens again ~191
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Old 08-19-2004, 12:10 PM   #3
dusktilldawn
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The Silver Bullet

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And just that switch operates the electric fan, right? Or does the A/C also run the electric fan?
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Old 08-19-2004, 01:25 PM   #4
Calebz
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Quote:
Originally Posted by dusktilldawn
And just that switch operates the electric fan, right? Or does the A/C also run the electric fan?

Thats something thats up for debate.. I have never gotten a consistent answer on that.. and I have been too lazy to dig the info out of the FSM.. when my fan started acting up, I just created a new circuit with its own 30A relay so it just comes on with the key.. this is friggin Texas.. It should be running all the time anyway
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Old 08-19-2004, 01:29 PM   #5
All_talk
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According to the í89 FSM:

Thermoswitch On = 199 to 207F Differential = 9 to 16F

Another thing I noted is that the turbo cars with the auto trans have a more powerful electric fan motor, 140W vs. 120W (turbo A/T cars also have the ďall metalĒ dual core radiator).

I thought that the fan came on with the A/C, but I just went and check it on my í87 RX and no fan with A/C on, but maybe my fans broke Ö Iíll see if I can confirm later.

Gary
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Old 08-19-2004, 02:12 PM   #6
dusktilldawn
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so the tanks aren't supposed to be plastic on my 87 gl10 a/t radiator? i thought they were, but it might be an aftermarket radiator. does the auto have an a/t cooler built in?

i know the fan never came on with the a/c on my 87 gl, but the connectors on the thermoswitch were so rotten that it would have been a miracle if they did work.. also, my gl and gl10 have considerably different a/c compressors. the gl10 is much smaller and looks to be an aluminum case, while the gl is a huge, heavy cast iron compressor. is there any one out there that is any better than another?
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Old 08-19-2004, 02:42 PM   #7
All_talk
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Yes the auto cars have a cooler in the radiator, Iím not sure about OEM manual cars, but all replacement rads have the A/T cooler. And, yes an A/T turbo car should have a brass tanked dual core rad.

Just checked the wiring diagram in my Haynes manual (I donít have the FSM for that section) and it shows a high pressure switch that activates the fan relay when the A/C is on, so I think the fan should run with the A/C (guess I have some work to do ). From what I can tell there are 3 types of compressor used, Hitachi, Panasonic and Matsu****a, the later two seem to work with the same system.

Gary
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Old 08-19-2004, 03:19 PM   #8
Calebz
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1996 GrandCherokeeLimited

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I have never had a Dual core radiator in any of my turbo cars.. and 3 of the 4 have been AT
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Old 08-19-2004, 03:42 PM   #9
dusktilldawn
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I just hope that the turbo a/t rad is no thicker than the carb m/t rad is.. i replaced the oe clutch fan and the oe electric with two FAL 12" s-blade fans. they were the thinnest I could find, and they just barely fit..
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