jdmdohcpower

Not long ago I was driving and my temps went above 200. It came back down and didn't do it again for a few drives later. I replaced the rad cap, OEM thermostat. After that it was fine briefly and than I went to use the heat and there was none and as soon as I moved the seeting to heat the temps spiked again. I got the front end real high and burped a ton of air out. Seems ok but now its running 174-192. Prior to any of this it was 172-178. Never went into 180. Fans are working. Any thoughts on why its reaching 192?

Chuck S

The engine coolant system is designed to keep the engine at optimum operating temperature. Not just keep it cool. Gasoline engines run most efficiently right about 200°F. 172°-178° is definitely too cold. 192°that you're seeing is in the range it should be. 210° or 220°F is nothing to get concerned about.

Standard Thermostat
Starts opening: 169-176F (76-80C)
Fully Open: 194F (90C)

I data captured and graphed my Expedition towing a trailer across the PA Turnpike thru the mountains. Darn near a flat line just below 200°F right where an effective cooling system should maintain it. Haven't done the S2000 but I'd not want it running 170° or 180°F.

-- Chuck

jdmdohcpower

Interesting, for the 7 years ive had my EMS serial gauge in there it ran under 180 so Im not sure about that

postman

Ap1 cooling fans don't even kick on until almost 210°. Not sure what temps you guys were reading. Possibly different on ap2. It will doubt it.

jdmdohcpower

I don't think that's accurate. My fans are 179