Question on Temperature Gauge Reading

If you check with the vendors I mentioned, and perhaps 928motorsports.com as well, they will know what the options are. To some extent it becomes a judgement call on what you find right for you. You can certainly ask here if anyone has one of the products out there offered and how they like it, or if they developed their own fan.

When I was racing, I just got a puller fan and mounted it on the inside of the radiator, basically it was just a matter of determining what CFM I wanted and was available in a size that would fit. When you removed the current fan you will have quite a bit of room

Contacted the previous and original owner. The 928 reportedly has always run with the gauge 3/4 toward hot when idling with the A/C on. And runs 2/3 towards hot rolling down the highway.

I think that a 2/3 reading is high on that year car, no more that 1/2 unless something is not working corectly. Get a real Infra red temp meter and check it out.

As far as the fan's go, the belt driven fan should only spin freely (engine off) when cold, when hot (eng off) it should show resistance (else it won't work) to pull the air. Should be able to get a used one form 928international.

The electric fan should come on for three reasons:
1. by the temp of the radiator when it gets about 2/3 on temp guage, this is controled by the switch on the lower left side in the fron on the rad.
2. When the AC/ is on and the A/C Drier get to high (from heat in the A/C).
3. Intake air temp switch may depend on what year.

These stock systems work realy great and do not over heat if everything is working corectly, also please make sure you are running 50/50 antfreez/water and add a can of water wetter

Dave

PS: I do agree that all of the gauges do vary and most of the newer '87 and up seem to run at 2/3, but the pre S4's not so much.

My '79 ran at bottom third of the gauge since I got it. I just had it serviced (With major thanks to this fourm for helping me finally find 928 mechanics in NJ). Turns out I needed a new temp sensor and now gauge runs at just below the half way mark. My '80 also ran around half way range too. Fans kick on when it's hot out.

My 83 runs at 3/4 when hot and a little below 3/4 when it cools off. This has remained consistent even with the 90+ degree temps so far this summer. I believe this is pretty common on the older cars. As for electric fans, check out 928 Specialists. They have a twin fan SharkBlade setup for about 450.00 which seems fairly easy to drop in. I am thinking of doing that as an upgrade later. I really have no overheating problems running at 3/4 right now, just would like to improve it.

Update from Oct 2011:
I put in 2 new 75 degree centigrade thermos, one in the engine of course and the other on the driver's side bottom of the radiator. That one controls when the outside fan kicks in. You should replace them both so the work together and bring the cooling on at the same time. Since I have done that, I run a little below middle to slightly above if I am blasting (like on a Fun Run with other 928's through the mountains). So it has helped tremendously and was relatively cheap. It also helped fix a heat-sinking problem I was getting after I turned off the engine. It would not start for up 1 1/2 hours like that unless you did it in about the first 5-10 minutes. Problem is now solved. Might be wise to replace the thermostats if they have not been, and if you are inclined, use the 75c ones instead of the stock 83c ones. 928 Spec or 928 Motorsports etc. have them

This may help if your outside fan and inside fan are not really pulling their weight right now and a lot cheaper than replacing both. You have to be careful with the electric fans on older 16v cars. They do not have the juice of the 32v'ers. If you have a strong electrical system and are putting out good consistent power, like 12.5 to 13.5, then you might be fine. But read the specs on what you are adding to what your electrical system (especially that model year) was designed for. Good luck

My 89 runs between 1/2 and 3/4

Here is a Rennlist link on a cheep fan mod

forums.rennlist.com/rennforums/928-forum....html?highlight=fans