1995 gmc sonoma 2.2 5 speed manual it runs on the highway mark right past 210 probably 220. is this normal. in town it runs cooler probably 185 190. If i run the heater on the highway it stays about 185 190 it has a 195 degree themostat in it was wondering if i should put a 180 in it any advice is appreciated. it has new motor water pump egr valve plugs wires pcv valve tensioner belt themostat and radiator was flushed.
It should run at 195 +/- very little on the highway , thats the thermostat opening temp. If it's higher it's either: low on coolant, restricted or bad thermostat, defective water pump, or plugged radiator. take it to a "radiator shop" and have them diagnose it.
It could also be though less likely a bad cylinder head gasket.
They will heat up worse under a load than at a stop. You would be having to add coolant if it was a bad head gasket though.
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