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.

[quote:295b724862="Kathy Brown"]I have a jeep cherokee 2000, approx. 95,000 miles in june replace radiator thermostate and belts, recentley began overheating again, has made a piercing high pitch sound that last briefley when it is started. The repair shop is unsure if it is head gasket or water pump. Any ideas?[/quote:295b724862]


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