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Since I am a new 928 owner one of the very first things I had to overcome was the common overheating issue..so in my efforts to contribute to this site, here are the steps I used in my approach to cool down my engine. After much researching and reading from this site, Please review my attached Gauge Pic.. You can see my original setup needle location would reach the upper level RED mark, of which I would never let it go beyond that point. The (First) thing I did was to replace the temperature sender to verify if the sender was reading incorrectly or not, but the reading was pretty much at the same location as the original reading, (Secondly) I replaced my Thermostat (83 Celsius) which actually lowered it a little, but still not in a comfortable range, (Third), after doing a tissue test checking both fan directions, I found that my one of radiator fans direction was set as a pusher from the engine side instead of a puller, and the fan on the condenser side was set to pusher, so all the heat was literally contained within the radiator, when I changed my fan direction i noticed a large decrease in engine temp after reversing the wires for the fan direction. since the fan direction made a Hugh difference with a 12 inch fan, I decided to replaced my single 12 inch puller fan to a more efficient Dorman 620-104 dual fan puller as well as replaced my condenser fan to a larger 16 pusher fan. My final results with 90+ temps, my A/C running and highway test drive shows my gauge reading just above the middle zone on my temp gauge..which in my opinion is a more comfortable engine cooling point..So in my opinion, the thermostat made a small change, but the Fan direction (Puller/Pusher combo) and Fan size made a significant difference in the entire cooling system. Thanks for all support and quick reply's to my questions ..Al
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Hey Speed Toys, My guess is that the PO wired some replacement 12 inch fans, but never conducted a tissue test on fan direction...I couldn't understand why the engine was retaining so much heat within the engine bay, until I figured out the fan directions were keeping all the heat within the radiator..so after reversing the fan direction to a puller style, I noticed a great reduction in heat..so I figured I was on to something..
Just curious, do you have your belly pans on? BTW good job diagnosing your reversed fan problem. I just did the same test with a paper towel last weekend trying to gauge air flow through the condenser / radiator.
NO-Vector...that is one thing I did noticed, is that I do not have the belly pans on this vehicle..This Car is mostly all original, but I can see no that the PO was trying to diagnose a heat issue and most likely gave up..My point is when replacing my fans from a 12 inch to a larger 16 inch one, and changes to the fan direction, it actually made difference from my temp gauge point of view. ,
Al
At speed, I don't think the fans are all that important. They're critical in stop-and-go traffic, idling, etc of course. I don't know this for a fact, but I suspect belly pans are just the opposite. Sitting at idle, having no pans may even help slightly. However, at speed, without the pans, a lot of the air flow is not through the radiator as it should be, so it harms cooling.
06-19-2018, 01:13 PM
Overheat Fix My version!
