I know this has been addressed before on here. Searched the forum and couldn't find it.
Have an 05 Thunder purchased 7 weeks ago. On first 1000 miles when going up a hill, the normal 192-4 temp would start to climb. Around 200 it would start to drop, still in the climb. I figured; ok, the Tstat opened up or the two speed fan kicked to high. Started toward Phx last week. Noticed on long grades the temp would just keep climbing. Coming into Vegas on 160, a long steep grade, around 100'F outside temp, the engine temp just kept climbing. Trying keep the rpm up and slowing. Got down to 30 mph in 3rd (around 2,000 rpm) and temp climbed to 230'F and the engine cut back. This occurred several times before reaching the summit. I have since cleaned the radiator with Simple Green and garden hose. Didn't get much out it.
Questions is; is the thermostat sticking or the two speed fan not going to high. Leave for Phx tomorrow and expect more hot weather. I read on here some time back of someone having trouble with the two speed fan and disconnected the control to it, leaving it running in high speed all the time. Anyone know how to do that?
No time or possibility of changing the Tstat tomorrow, but if I could keep the fan running on high, I would.