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Re: random overheating
Have your cooling system checked for CO2. If theres CO2 gas in cooling system you have a blown head gasket or a cracked head. I use a co2 detecting dye kit from Matco. But there is a backyard method... if you have a battery powered co2 alarm in your house, warm the truck up with the radiator cap off, put a funnel in the radiator neck then place the alarm in the funnel, if it goes off you have combustion gas in the cooling system.
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