cooling the engine

I have a 1990 928 GT and my dash thermometer is always a concern as the car tends to stay a the last white line before the red.  Is there anything that can be done to improve engine cooling.  I have a new radiator and everything is working- fans,etc.
Several years ago Greg Brown was selling some kind of connection to the radiator where there is an oil cooler........but then Greg Brown retired.  Roger, our beloved supplier, recommended a higher viscosity oil....I am just wondering what other people are doing.  It is just un-nerving as every other car in my stable has temp gauge running with the needle dead center.

 

On your 928GT, you have electric cooling fans. I think at one point 928 Motorsports produced a dual electric fan that pulled 2700 CFM (which I presume was more air than the stock 928 GT dual electric rans.)

On my 86.5 928, I had the mechanical fan and I always ran toward the upper line on the temperature gauge. I installed a dual electric fan from a 1998-2002 Ford Contour as it almost exactly covers our radiator, and it flows 3,500 CFM.  Since installing this fan (and a Delta Current Control 2SPA fan controller), my temperatures are almost always at the bottom white line on the temperature gauge while using the stock radiator.

I AM VERY INTERESTED.  Who was the manufacturer of the fan as they are all over the internet for less than $150,  I only have 100K miles on my car and i plan to keep it.  I live in Florida and as the engine gets hot, the interior gets hot......my mechanic even went so far as to weld off the rear AC freon lines so at least I can get cold air blowing out the dash.  I did communicate with Greg Brown a few years ago because he said the bottom of the stock radiator has a built in oil cooler but he went out of business before he could sell me the oil line plumbing connector.  I am taking my car in Friday for major service to a new mechanic.  I am ready to hop on your mod.  Do you live in the South and how long have you had this mod?

I've had this modification on my 1986.5 928 for about 2 years now.  The fans are Ford manufactured fans that fit on a 1998-2002 Ford Contour with the 2.5 liter V6 engine.  Despite displacement of the Contour, these fans do move a LOT of air and are both very reliable and quiet.  I used to have a SVT Contour and can attest that these fans are pretty "bullet-proof."

If you look on Car-Part.com, I would locate a used "dual cooling fan" for a V6 Ford Contour or Mercury Mystique. It should be around $50-75 for the shroud and fans (and hopefully it comes with the factory connectors for the fans and the resistor.  If not, the connectors can be acquired via eBay as new replacements, and the resistor can be had from your local auto parts store (Dorman is the typical replacement most auto parts stores carry.)

The Delta Current Control 2SPA fan controller is needed.  It's about $100 plus shipping, but is compact and well made.  I have run this fan controller on my 928, Mustang, and Ford Explorer (4.6 V8) successfully and without issue.

In fact, we will be doing this exact same electric fan solution on my son's 944 (replacing the factory electric fan).

I'm actually in the SouthWest (Arizona), but can appreciate the heat and humidity in Florida!  I would do this fan modification first as it does move a lot of air.  If you're still running hot, perhaps an aluminum radiator replacement may be worth considering?  I purchased the Keuhl AC compressor, condensor, evaporator and valve from Griffiths Air Conditioning (Griffiths Technical in New Jersey) and that did a nice job of cooling my 928s interior (replacing the factory Nippondenso conmpressor - though Griffiths does sell the Nippondenso compressor as well if you ever need one.)