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Check the radiator fans to insure that they are going on. Start the car and watch the temp guage. If it keeps going up and the fans have not turned on, it's the fans.
BE CAREFUL NOT TO OVERHEAT THE ENGINE, AS THIS WILL BLOW THE HEAD GASKET. A MUCH GREATER AMOUNT OF TIME AND MONEY TO FIX
I suspect that while driving the air flowing over and through the radiator is keeping the coolant cool enough to keep the temp gauge in the 1/3 to 1/2 temp setting.
If the fans are not working, it is most likely the temp control switch located on the right hand of the radiator, looking at the front of the car. This is not a difficult part to change, just awkward in it’s position. Stand over the radiator and look down and to the right. You will see the switch half way down the radiator between the radiator and the engine, under the fan housing.
You need to remove the fan housing to get to the switch. Four screws removes the fan housing, then you can remove the switch after draining the radiator. (VERY IMPORTANT).
BE CAREFUL NOT TO STRIP THE RADIATOR WHILE REPLACING THE SWITCH. THE RADIATOR IS PLASTIC AND SEVERAL HUNDRED US DOLLARS TO REPLACE. A think a 24MM socket fits, but not sure.
The switch costs 20-25 dollars, make sure you get the switch for your years model. The early years switch will not fit later years. Pelican has the part. Also get the 50 cent washer. Takes about 1 hour for the job.
I think Pelican has a procedure for testing the fans by running wires from the battery to the fans. BE CAREFUL NOT TO CHOP OFF YOUR FINGERS. DO THIS TEST WITH THE FANS OUT OF THE CAR, SO THAT WHEN YOU JUMP WHEN THE FANS START, YOUR FINGERS ARE NOT IN THE WAY - THIS IS A VERY MESSY MESS TO CLEAN UP, PLUS IT WILL WRECK YOU DAY.
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