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Re: Overheating?
for sure get a manual reading on the engine for comparison. those digital heat guns are pretty cheap these days. a good old fashioned meat thermometer in the rad cap hole or placed on the thermostat housing may also give a decent indication if you don't wanna spend the cash on a digital one to check temps at the thermostat housing.
it is pretty common for a thermostat to wear out some and the movable part will rub on the stationary part and can end up not opening fully or not closing fully sometimes, depending on how it sticks. also, some of the aftermarket thermostats are not worth the powder to blow them. I usually try to stick with OEM only thermostats for this reason. you also may want to remove the cap, when cold, and have a look at the ends of the rad tubes. some coolant may need to be drained for this. look for blossoming around the ends of the tubes. this indicates some occlusion of the rad (plugging and causing poor flow and heat dissipation) from calcium or deposit build up inside. also, engines may run hot if the water pump isn't pumping like it should due to debris in the impeller or partially eroded impeller which can be caused from coolant that hasn't been flushed in a long time. the PH level of the coolant can change and cause corrosion. also, look for debris in the rad fins or anything else that may occlude air flow through the rad.
just a couple of thoughts to consider
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