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Message: <blockquote data-quote="ReplicaR" data-source="post: 1478497" data-attributes="member: 9209">Cooling issues: Some more interesting information as an update. Last event I was testing the car, and I noticed that when I was sitting in the pits, the car was getting warmer and warmer, highly irregular considering that the fan was on, and it was 55 F outside. I went for a run anyway, since it was under 200 degrees on coolant temperatures, and when I came back, the car was reading 185... I was flabbergasted. How is it possible that that engine goes and does wide open slow speed autox run, and comes back cooler. But then I had an idea: what if my water pump isn't spinning fast enough at idle, courtesy of my BBK under-drive pulleys? To test that, I raised idle to 1500 rpm, and the car started cooling down immediately. Right there and then I knew, the BBK under-drive pulleys aren't spinning the water pump enough to cool my engine.Of course 94-95 being all special and stuff, the OEM pulleys are impossible to find, and no one reproduces them. I got fortunate enough that a local pick-your-part salvage yard had a 94 GT which was already pretty thoroughly gone through, and luckily for me, the only pulley that was left was the water pump. I've measured the two pulleys side by side, and got following readings:BBK Under-Drive Water Pump Pulley: 146mmOEM Ford 94-95 GT Water Pump Pulley: 123mmThat's a 15% under-drive, which seems pretty harmless, but it wasn't really, and that's even considering that my idle speed is 950 rpm, much higher than OEM settings. The current combination is BBK under-drive crank and alternator pulley, and OEM water pump pulley, which cools the car off really quickly and effectively. I am probably still going to keep the under-drive pulleys on the other two in order to protect the alternator and power steering pump, but going back to OEM water pump pulley is a no-brainer really.<img src="https://i.imgur.com/hOT5Cmi.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="https://i.imgur.com/Dxhu6jC.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="https://i.imgur.com/gystZ3r.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="https://i.imgur.com/lcwiU0t.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>