[dry664]

Can someone describe the correct operation of the radiator fans as the engine warns up? Thanks.

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[vliegwielolaf1234]

Have a look here , it's the same as the late style 944





http://www.clarks-ga...ual/cool-01.htm



And use search option .



Greets

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[dry664]

Thanks. I did try the search function and couldn't find anything definitive. I also looked at Clarks and it was a bit confusing and doesn't clarify for the 968. Now I know its the same as a late 944, this is how I understand they operate for cooling:



- At 92degC the left fan operates at slow speed and continues to run until the temperature drops below 92degC

- If the thermofan switch senses a 'high temperature condition', then both fans run at high speed



Is this correct? I assume the fan 'sides' would stay the same regardless of whether the car is LHD or RHD? Thanks.

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[vliegwielolaf1234]

No the both should run at low speed at 92c (there ar different sender untis availble so could be at a different temp when it starts running ) . And the both should run at high .

They should always run both at the same time and same speed .

if only one runs at low speed than check the ballast resistors just under the windshield near the battery , it is in a different position in the 968 than explaind at clark's .

But system operation is the same



Everything is explained in clarks write up , you should just follow the steps , than you will find the problem .

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[Bulti]

I solved all my fan troubles this way, and I know practically zilch about the electric and electronic stuff. Worth a try!

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[dry664]

Finally got round to using Clarks to troubleshoot my fan issues.



For the relay test when I jumper 1 and 3 and turn on the ignition I successfully trigger both fans on fast speed.

When I jumper 2 and 3 the fans run at the same (fast) speed but only for 6 to 8 seconds, then pauses for a couple of seconds and starts up again.



Any thoughts? Bad relay? Thx

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[968cabx2]

Check your fan resistors. I had the same symptoms, replaced the fan resistors and the car has never cooled better.

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[dry664]

Which fan resistors? Ballast resistor (I only have one) or the circular ones under the dash?

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[flash]

the connections on the 2 on the firewall near the vacuum canister are well known for getting corroded and causing issues.

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[dry664]

Flash, sorry to be a pita but have you got a pic?

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[flash]

nope - sorry



lift up the heater motor cover and you'll find the two hockey pucks on the firewall on the right side of the car, assuming that a RHD car has them in the same place

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[dry664]

Lifted the heater cover on my RHD car but cant find any hockey pucks. Here's a pic....



And another....



There are a couple of 'hockey pucks' under the dash on the drivers side. Could these be the ones?

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[Bulti]

Looks like you found them :-)

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[968cabx2]

Those are them. The connections look pretty clean but I would still remove each wire and clean both sides of each connection. Then I would take a resistance measurement at each resistor and at each point on the relay socket. There is a fantastic DIY in that area of these forums that will show you exactly what to measure. My bet is that either a resistor opened up or there is a bad connection.

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[flash]

i assume you have an RHD car, so yes, they would be on the driver side (the right side of the car). that's pretty much where ours are

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[dry664]

I cleaned up the connections on the resistors but no change. I measured the resistance using the DIY guide and I'm getting approx 0.2-0.3 ohms instead of the suggested 0.6-0.8ohms so I guess bad resistors? Do I get replacements from Porsche? Thx

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[flash]

that's where i got them. they were not expensive.

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[dry664]

Will be on the phone to the local Porsche dealer tomorrow. Thanks!

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[Westy]

Subscribed in case I haven't fixed my similar problem!

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