I have an '89 Quad 4 Pontiac Grand AM with overheating problems. I've replaced the themostat, water pump, and the heater core. Have plenty of coolant and no leaks. Any suggestions? Wayne Journigan
Cracked head or blown head gasket which they are notorious for
Testimonial: "Do believe you hit it on the head gasket. Used a bottle of BARS head gasket &block sealer. Problem seems to have gone away. Thanks"
SOURCE: Replace heater core in Pontiac Grand Am GT 3.4l
ram a sharp chissel or pointed head centre punch through the core and prise it out .,than tap the new one in place ,,,there u go bobs ure uncle
SOURCE: 1996 Pontiac Grand Am overheating
If its the 3.1L it could be your intake manifold gasket , the material used for the gasket does not react well with GM's Dex-Cool antifreeze. The leak may not be apparent at first, but I would pressure test the cooling system. If you look at the front of the motor by the belts , try to peek down at the intake manifold and check for slight seapage to an obvious leak.
If its either of the Quad-4's they were notorious for heads warping or cracking.
SOURCE: Dodge 2002 Grand Caravan V6 3.3 engine overheating/no cabin heat.
Replace the bad radiator hose first. Second- get you special formulated anti-freeze dye from the auto store and pour it into the radiator. Third- make sure you got all the air pockets out of your system, cause the coolant system won't work with air pockets in it. Fourth- Check for leaks by looking for the colored dye. If it's not the radiator hose, then could possibly be a pin hole in your radiator. Would suggest replacing all the radiator hoses at the same time while you got the coolant system disconnected, cause you don't want to have to come back and replace another hose in a few months.
Testimonial: "Helpful & quick feedback! Thanks! "
SOURCE: leaking water from heater core 1999 gran prix
If leaking coolant under dash on passenger side floor broad it's your heater core. Call's for 2.8 labor flat time to remove heater core, in some case's you'll have to recover, evacuate and recharge your A/C system to remove your heater core.Sit under dash on passenger side.
Testimonial: "thank you for the info appriciate very much"
SOURCE: Sounds like water running in the dash area when I accelerate.
I have the same thing on my rodeo, I thought it was just dripping through the heater core, I don't have any leaks, I know it's not the water pump. Mine only makes the sound when I shut it off. Yours might be the ac drain, If it's clogged, it will collect water, eventually it will drip on the floor. There is a drain plug on the fire wall, sometimes gets clogged with dirt, mud, bugs, undercoating, whatever. Check it out.
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