okay let me make some things clear......this is what i have

86 Camaro Z28, 305 v8 5.0 TPI

NEW 3 Core Radiator
NEW 16pds Radiator Cap - Pressure Release
NEW Water Pump
NEW Thermostat (185 or 195)

Bypassed the Heater Core
Flushed the whole system with that Prestone Flush Out Kit
Checked Oil
Dumped some of this Car Cooler i saw on 2 Guy Car Garage

I think its called the Aim Dam........thats fine.......

sooooo after all this IT'S STILL OVERHEATING!!!!! Bubblin in the overflow BIG TIME......not some lil bubble bubble its a rumble....anti-freeze comin out tha cap......

What me and a few other people were thinking was that their possibly is a block in the engine......maybe there was corrosion in there n it fell over and its blocking the passage.....

My question is is there a way to pressurize the motor to get a good strong stream of water thru the motor in order to possibly get whatever the blockage in the motor is out of it??

I need help desperately, if someone can tell me how to get the blockage out that would be absolutely great.....its my only car and ive been smoochin rides offa people in fear that ima blow the engine..... <--------says it all

 

you sure theres no cracks in either the heads or block? they would cause the bubbling

 

How soon does it start bubbling? Is it within a minute of cold start-up or does it gradually get hot then start to bubble?

A bad head gasket will show the same results. Basically the leaking combustion pressure will displace the water in the engine & cause the engine to get hot. Some air will bubble out the radiator as well.

 

Any condensation in the exhaust? Some is normal, but there doesn't have to be white clouds of smoke to be a head gasket.

I'm betting its a had gasket...

Ryan

 

well i can drive on the highway and the temp will never go above 220......but once i start gettin into town traffic then thats when the temp goes up....way up....itll start bubblin over prolly round 15 mins or more or town driving....

 

Sounds like your fans arent kicking on. Its getting enough cool air when you drive fast or at high speeds but when your in town, no air flow your overheating. Check your fans.

 

What temperature is the coolant gauge indicating when the bubbling starts? Probably would have been a lot clearer if you had included all this info, regarding the actual temps, freeway driving vs. in-traffic driving right from the start.........

 

The stock fan setting is also around 210-220 on a 3rd gen.. When does your fan come on? Your car should never go above 220.

Also when you replaced the waterpump was it reverse rotation. The serpentine belt cars used a reverse rotation pump & the v-belt cars were standard rotation. I have seen this too many times where the pump goes bad & the local autoparts reject sells you the wrong year pump.

 

One other thing is if your thermostat is in backwards it will have those symptoms.

 

cracked headorblowhead gasket.

everytime my 3rd gen over heated it was because I had the Air dam off for snow It would flat boil over on the freeway at 70mph

 

You should not remove that airdam that is needed for proper cooling on the car.