1993 Nissan Truck over heating

1993 NISSAN TRUCK
303,921 MILES • 4 CYL • 2WD • AUTOMATIC
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IOWABALLER32
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I was wondering what could cause my truck to be over heating. I changed my waterpump ,thermostat ,and head gasket. my radiator is not clogged , it is free flowing, and hoses are free flowing. So i was wondering if you woudl know any other reason it woudl be over heating?
Oct 16, 2008 at 7:30 PM
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RASMATAZ
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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: ,Pressure test the Rad. cap,Clogged radiator,air lock in the cooling system ,Fan clutch,Radiator electrical fan,collaspe hoses,water pump.
Oct 16, 2008 at 10:07 PM