I did a forum search and was overwhelmed by the amount of info. Where do I begin? Sorry, bit of a newbie here...

My car normally runs at 85-90 degrees all the time. The other day I'm sitting in traffic on a hot day, and my temp is climbing to like 110-115 degrees. I get home and open the hood with the engine still running, and I see that neither of the fans are spinning. The temperature goes back down if I can get up to speed, but when sitting in traffic, it quickly goes back up.

What is the first thing to suspect? Is it the thermostat that controls the fan? Or is it something in the fan clutch that activates it at the right temperature? The fan should be spinning if the temp is that hot, right?

I do have a greasecar kit installed, but that has been in place for months now, so I don't that is related to the problem.

Where do I begin troubleshooting?

Thanks!

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine