Check thermostat first and If its still is running warm it could possibly be the radiator. Since you state it has been pressure washed twice it is entirely possible that you have separated the fins from the tubes enough to effect heat transfer. My guess it your radiator. Check it for cold spots to determine if it has any restrictions through the core and check to make sure the fan is working correctly.
JDR
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Jimmy Dean Ross
1988 Newell Coach
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