rob76turbo

The Details:

Okay, it is hot here in the DFW, TX area today, my car showed outside temps between 102 to 106. Running on the highway, about 75-80. On the temp gauge, it ran all the way up the to the top white line and then back down about 1/4 of the way back towards the middle, then back up...then back down, and on and on....

Got back to the home front and pulled in the garage and let the car idle. It easily backed down to the middle and stayed there.

So this sound about normal for the heat? Anyone running Water-Wetter and does it help? Any ideas?

Thanks in advance!!

PorscheG96

I wouldn't worry about it considering extreme ambient temps but I suppose you could try bleeding the coolant just in case. Water wetter is snake oil IMO...

rpm's S2

What you describe sounds fairly typical for a 968 in hot, humid weather. The gauge is very touchy, displaying only a narrow range of temp so it seems like it is fluctuating more than it really is. The 10 o'clock line should trip the fans to run at high speed, knocking down the temp fairly quickly.

Now if it runs over the 10 o'clock bar and/or up into the red, then you have a problem.

I know racers who swear by water wetter, but it did not seem to make any difference when I tried it last summer.

ltc

Water wetter (RC20 is one brand name) is quite common in karting, where glycol is NOT permitted, only distilled water.
Unfortunately running only distilled water tends to dry out the (water pump) seals, so running WW tends to help this along.
It also drops the operating temps a bit, although that is normally controlled by taping up the radiator to get the optimum temperature.

rob76turbo

I have tried jacking up the front of the car, running the heater and using the valve at the top of the engine to bleed the system (coolant came out right away). I did not squeeze the large water hose that goes back into the motor (my bad), I understand this is another place where air could be trapped in the cooling system. Is there anything else I can do to remove air pockets from the cooling system?

rob76turbo

One more thing, I think I read that some of the new thermostats do not work correctly and some people have had to put in 2-3 before they found one that works. Does that sound about right?

968workaholic

Buy a 160 temp thermostat from Napa and a low temp. fan switch. Your car will never run above the middle of the temp gauge.

rob76turbo

Thanks!! Where do I mount or install the fan switch?

Jason Judd

I have an Autometer temp guage in my car...I've been seeing 180 on the track for my coolant and 240 for my oil temp's.

SpeedBump

Just test it in boiling water first to make sure it is good before you tear anything apart.



Is it really running hot or is the guage just bouncing?

Also check your grounds.

rob76turbo

I added Water-Wetter yesterday and could see a vast improvement in the running temp. Only went up 3/4 of the way towards the top white line when running slow (20-30 MPH). Then went down to almost the lower white line when running at highway speeds. When I got back to my home, it idles down to below half way within a couple of minutes. I will for sure keep an eye on it.

968workaholic

The fan switch is on the back side of the radiator under the connection for the upper radiator hose