95 Chevy Caprice 5.7 Overheating

[j cAT]

Originally Posted by mr chambers

Bought a 95 caprice 5.7, battery would not hold a charge, changed alternator, battery post and battery, found it was charging wire was cut inside harness, ran new wire to fuse box under hood, instrument panel and digital dash did not work, changed cluster and fixed it. Car keeps overheating so checked radiator and it was good, changed water pump and.thermostat, bled block several times on several different days, but still keeps overheating, no miss in motor, no liquids mixing, no smoke from car so not a head gasket.Cars runs and sounds great, but keeps overheating aftef only about 5 minutes of running and both fans work. This thing is driving me crazy, please help.

my experience with what your already done is too much pressure or NO pressure. squeeze the radiator hose see if its with pressure. loosen cap see if it is with pressure.

the other issue would be mixing coolants your 95 should have the green coolant . in 1996 GM changed to Dexcool gm approved coolant. If someone mixed these it will get gooped up..

also removal of the KS both drains the block then you flush out thru the T stat bore until clear . then using a water hose flush out the heater core by removal of the hoses at the block not firewall. until clear and good flow then blow out.

do not use drinking water in these engines only use distilled even with the other type coolants .. 50% mix I do not use .. tested it and it is not 50% but less also very expensive distilled is 1 buck a gallon not 6 bucks.

[rhandwor]

If you installed the thermostat backwards they will over heat before they open.