Overheating Issues, Perplexed

[elmariachi]

Originally Posted by Cobrabill

No such thing as "too much motor in too small a space".Stupid stuff first:T-stat.I've run into bad T-stat after bad t-stat.Six in all.Either failed out-right or in-accurate opening temps..

I have tried three leading up to the hi-flow and it has made no difference

Originally Posted by Cobrabill

I'd install a restrictor instead of a T-stat JUST for the trouble shooting process.

The restrictor works just like a closed thermostat. The car is fine until the temps open the thermostat and then they just keep climbing. Restrictor will tell me nothing at that point.

Originally Posted by Cobrabill

Collapsing lower hose-as mentioned.
Correct pulley size-as mentioned

Covered above.

Originally Posted by Cobrabill

Correct spacing between back of the impeller and the back of the water pump. Too much space and cavitation results.If it's a parts store pump,double check the impeller to make sure it spins the "right" way.

Its spinning the right way, but it could be failing or cavitating.

Originally Posted by Cobrabill

Radiator must be aluminum of sufficient size.It also must be sealed to the nose so that every "drop" of air entering the nose is forced thru the radiator. All things being equal,a shroud + fans with enough CFM should in no-way make things worse.The above is written on the premise that jetting/timing and all other motor functions are with-in parameters.

Others runnning this radiator have made it work but as we know, each car is different. Given that we've ruled out the engine (for the most part) its got to be an inability to dicharge the heat in the radiator, either due to flow/restriction/water pump issue or insufficient radiator/cooling system capacity.

Originally Posted by Cobrabill

I just saw this in your post: Dexcool?!!!!Get rid of that SH!T NOW!!!!Deathcool is one of GM's biggest blunders.It eats gaskets and other things.

Thanks for the advice though, but I am sure its not my problem as of right now. I had 10 gallons of it left over and decided to use it through this process of puking/discharging and running out on the ground from t-stat changes. I will be running Shell ELC once this is resolved, but I am sure someone will complain about it too.