Spuds993

Can someone post the graphic of the 993 oil temp guage with the numbers on it? I've searched and can't find it.

CarmG993

Replacing the resistor isn't that bad, about a 45 minute job, and didn't involve taking off the front bumper.

Ed Burdell

I popped that connector off behind the right headlight this weekend to keep the fan on high speed, and boy, what a difference! Aside from premature fan wear, I can see running this way ad infinitum, especially since my auto transmission fluid is cooled by the same fan.

Spuds993

Thanks for the graphic... I'll be looking into the high speed fan switch deal this weekend, should be fun.

Acropora

Will this mod work on a TT? If so, I'm on it!

Chuck W.

One of the best mods I have done. Bumper to bumper traffic on the Los Angeles freeways in 100+ temps and the gauge doesn't pass the 8 o'clock position.

Spuds993

A question I have is does this mod disable the automatic function of the fan completely? Or is it just a temporary overide of the automatic functions of the fan while switched on?

Does that make sense?

jimbo3

My question is the same as Doug's (I think)- When you disconnect the sender, does the fan run at high speed from the moment the ignition is switched on until the ignition is turned off? I'm assuming that it does as the sender is no longer operational.

If that's the case, is there a way to connect the blower so that it switches on to high speed at 194 degrees and skip the low speed altogether? Here iin South Texas, there doesn't seem to be a need for the low speed....

TIA
Jim

CarmG993

With the switch off, your low speed fan will still engage. I believe so will your high speed fan (know one seems to know the temperature when the high speed actually kicks in). With the switch on, it puts the fan in high speed, and will remain in high speed until it's turned off.

Dan V

"At approximately the 9:00 position (probably a little bit above the 9:00 position), the fan will start in slow-speed, corresponding to approximately 230F (993)."
http://p-car.com/diy/fan/#Normal%20Operating

So...
How does making the fan start in high speed when it was previously starting in low speed keep the temp guage at 8:00??? Are people not reconnecting the resistor correctly and causing the fan to run all the time?

jimbo3

Dan- That's my take on it. (That the high speed fan is on full time whenever the ignition is on.) When the t-stat opens at 194 degrees, the fan will cool the oil in the cooler immediately, I think.

And, am I reading this right, that the LOW speed is engaged at 230 degrees on a 993?!! WAY too warm for the fan to first kick in, IMHO. I'm thinking that low speed should engage around 200 and high speed around 220, but I'm certainly not any kind of expert. (Although I REALLY DID stay at a Holiday Inn Express a couple of days ago...)

Anybody know why Porsche wants the oil so hot??

Jim

Spuds993

I completed this mod this last weekend, and man what a difference it makes. Here is what I did:

Following the p-car.com instructions I tested my fan opperation by jumping the contacts of the oil cooler fan relay, sure enough, the low speed fan would not run, but the high speed would. This points to a faulty balast resistor I believe. Since this part is a PITA to replace (and I was short on time) I opted to just add the manual high speed switch at this time.

I bought the 944 hazard switch from Parts Heaven (close by) and went to town pulling the CCU out and locating the correct wire to splice into. Everything went smoothy, the switch only needs minor trimming with the dremel around its perimiter to fit perfectly into the center console between the manual tail switch and the sunroof switch. Looks factory.

As for the test, I took the car out for a drive (85F outside) and let her get to 194F then hit the switch, within minutes the temp was down well below the 194F mark (maybe 180F) and I drove her hard up the backside of the Altamont Pass (backroads) and the temp never got back to 194F. Beautiful.

I will eventually get around to replacing the balast resistor to fix the low speed fan, but I highly reccomend this mod to anyone who drives in high temps or in traffic, or who tracks their car.