[Yan2947]

I re-installed the thermostat today, hooked up the dual relays for the 1 16" spal fan. It was 95 degrees today and very humid. It was a perfect day to test the system. The spal fan cooled big time and I really noticed a much cooler temp with the thermostat. It took much longer to get hot and the dash gauge was considerably lower then yesterday. Having the coolant sit in the radiator a little longer I believe made a huge difference. I am running about a 1/3 dex to 2/3 distilled water. I drove for about 15 miles in total. At 3000 rpm I reached temps of about 206. At 4000 rpm I reached 221. I didn't try 5000 rpm but I am sure it would jump right up. Has anyone tried any high rpm's for a period of time/miles on a hot day and what temps do you get to. I happen to have a guage with coolant temp. The sensor is on the head as per Steve's instructions at RH. I also have a temp radiator cap which is at the end of cooling on the radiator and finally I am using an Iphone App - Rav, with the Elm327 OBD2 wifi attached. This one uses the computer's sensor - not sure where that sensor is but it usually is 10 degrees hotter at least from my guage. My fans kick on at 195 and goes off at 185. The 16" spal 22 amp fan works amazingly well. Once I layed off the rpm's the car cooled down to 185 in just a minute or two. My dash guage appears to be accurate and never went over 200 degrees today. I am just confused as to why the 20+ degree difference between that dash gauge and iphone app/car computer. I know one thing, I could have cooked a turkey under that fan today!