97 grand am overheating

[davemcj]

I have a 97' grand am se, 3.1, 4dr, auto.
My problem is its overheats in no time and boils the antifreeze out the resivoir cap. So far I've changed the resivoir cap, thermostat (tested new one its ok), headgaskets (not fun), intake gaskets, flushed rad and motor, fresh antifreeze.
The rad is clean outside and flows water good, fan works great, a/c works fine, water pump looks good inside.
None of this made any difference to it overheating. Is there something Im missing, any suggestions.
Only thing left I can think of trying is a can of gas and a match.
thanks

[skibum1111]

Did you check your heater core? Sounds strange, but I'm not sure if that will cause a v6 motor to overheat, it will on the quad's. Also, are you sure you followed all the directions on changing the head gaskets? I changed one in a sunturd and the manual didn't have all the directions, ended up changing the gasket again about 2 weeks later.

[davemcj]

I'm sure the head gaskets are ok I did everything right. Proper torque, new head bolts, all new gaskets, etc.
Heads are not cracked either.

[skibum1111]

Sounds like either the timing is off, the water pump is defective, or the thermostat is stuck closed. I'd start with the thermostat as thats the least expensive part to replace, if that doesn't cure it change the water pump, they are fairly inexpensive.

[davemcj]

The thermostat is where I started with the troubleshooting, replaced it with a new one wich I tested in hot water, worked fine.
I dont think the timing can even be adjusted on this motor, isnt it a self adjusting with the comuter?
Had the water pump off this morn it looks to be in really good condition and seems functional, all it does is spin right?

[skibum1111]

Yup water pump spins, what shape was the impeller in? They are relatively inexpensive, you might try replacing that. Are all the hoses good? No kinks, restrictions, etc. ?

[davemcj]

impeller looks like factory...no rust or anything like that.
Hoses should be ok, as I had everything apart a few times and flushed really well with the garden hose. didnt seem to be any restriction as far as water traveling trough the hoses, rad, motor, etc.
Guess maybe Im gonna have to spend the $$$ to get a profesional to check it out, I'm stumped, which really sucks, I hate to pay someone to do something I can be doing.

[xeroinfinity]

Have you tried running the car without a thermostat? Theres probley an air pocket trapped in the recirculater or up at the thermostat/housing and it sure does heat things up fast. \,,/

[cornell160]

Mine did the same thing....behind the belt there is a panel it'll leak antifreeze....theres a gasket in there...idk if you checked to see if it was leaking or not but its possible

[xeroinfinity]

Welcome to AF cornell160 !

Thanks for the tip!

Though Id hope the OP has it fixed by now, being almost 4 years ago.