I think that I have a temperature gauge problem. The dash says that it has been running hot lately (up near the red sometimes). I don't think that I have a cooling problem. Here is what I'm seeing and have done:
1) Checked the radiator "in" hose with an IR thermometer when the gauge says it is hot. The hottest I've seen it at is 200F. I think that tells me I'm not overheating? I'm not sure what normal is, but 200F doesn't sound that bad. It was driving up a pass on a hot day.
2) Both fans work. I can see them cycle on and off. They will cycle off even when the dash says it is hot.
3) I replaced the temperature sensor (Subaru p/n 22630AA11A, I used an aftermarket). This seems to make it worse if anything. I think this is essentially 2 sensors, one for the dash gauge and one for the ECU. Is this correct?
My understanding is the sensor for the dash gauge is a thermistor. Can I put a resistor betwenn on the the pins and ground to test the dash gauge end of things? What resistance value would I use?
Last fall I had the head gaskets done. They also put in a new water pump and tstat, so I wouldn't suspect those. I've also put in a radiator, but it was used so maybe it is clogged. From what I've observed I don't suspect a cooling problem though.
Thanks for any suggestions! I'm new to this so I'm probably going down the wrong path.