Bob Prosser

Hey all.

Question 1:

What's the simplest way to check the RF wheel well oil cooler fan on an '87 3.2? Although rare, my 3.2 got to 248F the other day (touched the bottom of the 11 o'clock white mark) and nothing happened. Stuck in hot, mid-afternoon La Jolla traffic.

The wiring looks buried. Instead of pulling off all kinds of parts to get access, is there a way to tap into and energize the thermoswitch wiring inside the luggage boot?

Reference:

As I understand, oil goes to the front cooler starting at F 182, or 83C. The OE thermoswitch supposedly energizes at F 244 or 118C -- too high. I am looking for one that energizes at or before F 230 or 110C.

I know the original temperature thermoswitch is part no. 930.606.118.00. The associated sealing ring for this unit is 14 x 18 mm, so it has a 14 mm threaded connection into the cooler.

Question 2:

I have been told the temperature switch for the 964/993 series of cars is part number 964.624.110.00 . It may also be 14 mm. It is supposed to come on at F 212 or 100C.

Can anyone verify this is a good update?

Thanks in advance <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />

Bob Prosser

Rick Lee

Can't help you except to give you a little anecdotal reference info. I've had my 3.2 for a year now and had never seen the front cooler turn on. A few weeks ago, while waiting in line for emissions inspection, I kept the car idling. At just above the 9 o'clock mark, I heard her kick on. It was a great feeling.

Last weekend I installed the numerical temp gauge and sensor. It was pretty hot and sticky here and on the test drive I got her above 180 deg. pretty fast. The cooler did not come on. I think it comes on well over 200 deg. but don't have my books handy.

Chris Martin

I got this from the Pelican site:

<a href="http://www.pelicanparts.com/catalog/shopcart/911M/por_911M_oilsys_main.htm" target="_blank">http://www.pelicanparts.com/catalog/shopcart/911M/por_911M_oilsys_main.htm</a>

This switch senses when the oil temperature gets hotter than a certain amount, and then turns on the fan. The stock switch turns on around 240-degrees Fahrenheit (110-degrees Celsius), but you can replace it with a cooler one that turns on at a lower temperature. Some slight wiring modifications may be required in order to use the cooler thermoswitches (they have different connectors on their ends).

The lower temp. switches they sell, 91 and 99 degree celcius, are 18.50 each.

Stephen Masraum

Chuck, I have had mine come on a few times in the past, last summer. It is up around the 250 deg mark on our gauge.

To test you just need to ground the relay or jumper the holes in the relay socket. The switch just grounds the relay when it closes. I wired a switch into my relay that is kind of hidden up under the dash so I can turn mine on manually if I get uncomfortable, but I rarely need it. Only when stuck sitting still or stuck in unusually bad traffic.

Bob Prosser

Steve, that was it -- thanks. Jumped the points on the relay and I see my fan works fine. Now I need to figure an easy way to change my fan's thermoswitch (hate to pull everything out of the RF wheel well to do it).

Bob

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KLehmann

For those of you who are not sure where the relay socket is located, you can simply hook the fan up to the battery with couple of wires. There is a two-pin black plug in the passenger side front trunk at the front corner. The plug is parallelled with the thermostat (brown and light blue wires) wiring.