Overheating

Has made a piercing high pitch sound that last briefley when it is started. Could be a loose belt.

Have the tests below perform

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat, Pressure test the Rad. Cap, Clogged radiator, Fan clutch, Radiator electrical fan, collaspe hoses, water pump.

Did they check for a head gasket failure?
Is the fan coming on?
Are u loosing antifreeze?
It’s very possible for head gasket to fail if you over heated the truck
Does a head gasket test?

Good luck