[Northern968]

I have a question for you guys. My 93 coupe is running hot. The needle goes up to the top bar within the acceptable range regularly. The fans cool it back down, but it continues to get move up and down constantly, during city driving. Highway is no problem, ofcourse good outside airflow manages that. I am not losing any fluids, and have the proper amount of fluids in the system. Water pump, and belts have all been changed in the last 20k miles. Any ideas?

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[sasilverbullet]

re-bleed the system first...I had the same problem, it was air in the system.

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[94SilverCab]

Thermo Switch? Lower temp thermostat? Did you change hoses at the same time as pump and belt?



Just a few things to check.



Regards,



Jay

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[Northern968]

[quote name='sasilverbullet' post='30034' date='Jan 19 2007, 05:34 PM']re-bleed the system first...I had the same problem, it was air in the system.[/quote]





Thanks I will give that a try and report back.







[quote name='94SilverCab' post='30035' date='Jan 19 2007, 05:34 PM']Thermo Switch? Lower temp thermostat? Did you change hoses at the same time as pump and belt?



Just a few things to check.



Regards,



Jay[/quote]





I will try the re-bleed first. Then check the switches you suggest. Hoses were replaced with the pump and belt change. I will let you know how I make out.

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[RPM]

How long have you had the car? You may be seeing the normal operation of the gauge. The 968 temp gauge is famous for seeming to run hot. The gauge is very sensitive to small changes in engine temp and registers these changes far more than in other cars. It is very common for it to seem to reach the upper limits of the center section (around 10 o'clock) before the fans cut in and cool it off. In the summer, perversely, the car will appear to run cooler as the AC automatically runs one of the car's two cooling fans continuously.



This phenomenon can cause you to constantly check the gauge and worry. But over time you will notice that just about the time it seems too hot, the fans kick in and it drops again. Mine moves up and down, but never gets to red. I have noticed it is more pronounced in winter when cooler air temps keep the fans off until kicked on by the temp switch as it gets to the top of the gauge.



Some owners have installed a VW switch that kicks the fans on more regularly and seems to keep the engine cooler. I did this on my 944S2 and the fans running all of the time made me crazy. A search will get you details and a part number.



Let me be clear - you may also have a real problem that needs repair. I just wanted to familiarize you with a common 968 issue.

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[Larry Currie]

I did the VW switch a couple of year ago and I am very happy with the way it works. In heavy city traffic in the summer in Alabama it was like it was on the edge of over heating all the time. Now, I don't worry.

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[RS Barn]

The thermostats are a real problem as well. The engine heats up/cools down with stop and go and fans kicking on and off. I tested several OE thermostats and they didn't open within the standard range. This lets the coolant temp soar. If you have a low temp thermo switch the fans will stay on alot. I would consider a low temp thermostat that opens sooner as well as a low temp thermoswitch which sets off the fans sooner.

You will see less of the 8 to 10 needle cycling

Pete

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[rustech]

I have both the low temp thermofan swith as well as the low temp thermostat and mine sits ON the lower line the whole time. Only exception is on the track.

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[Anchorman]

I have the regular thermofan switch and the regular thermostat. In the current cold weather in NJ, the temp gauge stays below the large (lowest) white mark and the next white line. During warmer weather driving, the needle usually rests on the lowest white line - but, in traffic, it ventures up towards the 10:00 white line - but I've never had it go to, or above the 10:00 white line, even on the track.

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[earossi]

[quote name='RS Barn' post='30136' date='Jan 23 2007, 09:22 PM']The thermostats are a real problem as well. The engine heats up/cools down with stop and go and fans kicking on and off. I tested several OE thermostats and they didn't open within the standard range. This lets the coolant temp soar. If you have a low temp thermo switch the fans will stay on alot. I would consider a low temp thermostat that opens sooner as well as a low temp thermoswitch which sets off the fans sooner.

You will see less of the 8 to 10 needle cycling

Pete[/quote]





Pete,



What is the temp rating on the low temp thermostat? And, would you have a P/N and/or source for the stat?



Thanks.



Ernie

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[danderson]

I too have experienced wide variations in the temp gauge readings. I have been wondering if there is a thermostat problem or a fan operation problem, but I wanted see if I could measure the coolant temp directly to see if the coolant was really hot. The gauge varies so quickly, I can't quite believe it. With the engine fully warmed up, does the overflow tank have coolant at a temp that is representative of the overall coolant temp?



Dwight Anderson

94 Red Coupe

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