Cooling still not great - 986 Forum - The Community for Porsche Boxster & Cayman Owners

shacky · 04-10-2021, 02:09 PM

I cleaned out my radiators - they were a mess - and replaced capacitors on cooling fans - both were bad - and temp still creeping up when not moving. It's still cool here in Rochester so I'm concerned I'm going to have issues when it gets really hot.

Couple questions:

Thinking I need to refill cooling system with pressurized system to make sure there's no air.

And low speed fan kicks in as soon as I turn on A/C. But I'm not sure it's turning on when needed without A/C on. Is that possible? Wondering if there's a separate regulator.

Thanks!!!

rexcramer · 04-11-2021, 07:31 AM

Has your water pump ever been changed? Or is it the original? There have been cases where the plastic impellers have broken off and become lodged in various places causing overheating issues. Plus the decrease in pumping ability.

I can't imagine ever X/O of coolant again without the Airlift. It is as easy, fast and brain dead simple as the video shows.

https://www.youtube.com/watch?v=FQnfUe6P5VI&t=29s

shacky · 04-11-2021, 07:55 AM

Replaced water pump and thermostat 3 years ago. Last year I did run low on coolant. Added about 3/4 gallon without pressure system. I’ve since purchased system - just need compressor.

sfkjeld · 04-13-2021, 03:46 PM

For what it’s worth.... I replaced the stock 180deg thermostat with a 160deg. I also replaced the 2.7L oil cooler with an S cooler. Both were simple R&R operations. The result is the car is running much cooler. On the gauge, the needle points somewhere between the 1 and 8. In traffic, middle of the 8. The fans have not kicked in. Of course, the weather is still pretty cool in Northern California, but so far, I am very happy. And interestingly, the car seems to warm up faster. The heater is effective within mins.

Also, the fans do come on with the AC. I’ve always turn on the AC when in traffic. Haven’t had to since the changes. Am sure I will when it warms up tho .

shacky · 04-13-2021, 06:34 PM

160 degree is what I had put in.

Still questioning - does low speed fan come on when A/C is off?

pilot4fn · 04-13-2021, 08:29 PM

Quote:

Originally Posted by shacky

160 degree is what I had put in.

Still questioning - does low speed fan come on when A/C is off?

Yes, at least in my car the low speed fans come on without the A/C when the coolant temp rises to 100 C - just checked this with Durametric las week.

Zordrack · 04-14-2021, 07:27 AM

Am I the only one questioning where the leak is if you have to add coolant to a sealed system ?

Or am I completely missing something here ?

Homeoboxter · 04-14-2021, 08:48 AM

Quote:

Originally Posted by pilot4fn

Yes, at least in my car the low speed fans come on without the A/C when the coolant temp rises to 100 C - just checked this with Durametric las week.

Same in mine. When you are saying the temp is still creeping up, did you actually look at the temp value how high it goes up to? Boiling temperature is completely normal. Does it go any higher than that?