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Phoenix, AZ 85008
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Those 3 bolts are either a 3/8" or 7/16" and require a deep socket with 3/8 drive. If you can get a 1/4" drive with a socket in there it will fit easier however I have been unable to turn the bolt because I could not get enough leverage. Even with that you will need and extension to turn the socket.
Highly recommend using some lubrication. A vinyl, rubber treatment or something like that would be good to place around the hole to those bolts.

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Phoenix, AZ 85008
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If the coolant has not been changed for years or the car has been sitting for long periods of time .... could be all of those. AND
Sediment in bottom of radiator or bottom of block
Water pump not flowing enough coolant
The radiator cap is too weak

Overheating is defined as coolant boiling out of the radiator cap.
If and when that occurs can be important. What I mean is during low speed or high speed (over 45 MPH) operation.

You might get an IR thermometer and spot different points. You can confirm if the T-stat is opening, if the radiator is evenly cooling from side to side (Should be hotter on top than bottom)

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