Hi I got a monte carlo that occasionally over heats I got a block tester and there was no gases present so it don't have a head gasket leak I've bennet chasing this problem for years anything would be helpful

 

never heard of a block tester to check for a bad head gasket. head gaskets can leak a number of ways though. coolant in oil is most common, that does not mean exhaust would get in there...

 

It test for gases in the radiator there there no coolant in the oil the only symptoms it's giving me Is its over heating and it bubbles in the overflow tank when I turn the car off I resintentley had the lower manifold gaskets replaced due to them failing

 

i would of just done the head gasket as well if you went that far and knew there was an issue you cant track. could try changing thermostat but im willing to bet its not the t-stat

 

I just replaced almost everything to the cooling system very resent the engine only has lIke 45,000 miles on it and it red lined due to the thermostat and it blew one the lower intake gasket it had a pool of coolant on top of the thermostat housing

 

hit red on the temp gauge could of warped the head itself.

 

Right but it only hit it for a minute before I pulled over and let the engine cool do you think it still warped them? I notice it runs good unill I come to a stop or until I get off the highway and today i wired my fans to a toggle witch so I could manually turn them on and I can turn them on high and low speed and I noticed on low the passager fan blows slightly less and when I turn it on high it almost completely shuts off and I was wondering if that was normal

 

hard to say if it did or didnt, my wife had a 02 monte ls 3.4 and hers barely touched the red and it warped it. not saying yours did though. if temps are fine on highway and overheats at idle i would really look into the fans. im not sure how they are suppose to operate exactly though

 

Hey Kainen,

When you say "gas test" do you mean the test for hydrocarbons with a combustion gas analyzer, or the chemical test which tests for the presence of combustion gases?

The chemical test can be pretty sketchy. Here's an example:

Other test options are the cylinder leak down test and/or checking for air bubbles at the radiator neck while putting compressed air through the spark plug hole with the cylinder being tested at TDC on the compression stroke, but they can be inconclusive too.

Here are those tests:

1. Cylinder leak down test:
2. OldSkool test with no special tools:
Also, have you considered the possibility of a clogged radiator? Experts suggest replacing the modern aluminum radiator every 12 years.

Cooling fans should also be checked to verify they're both turning on when the PCM and relays call for them too. I understand you have manual override. Do you plan to fix that?

 

I hope it's not warped but Is the passager fan supposed to have a high setting to because mine just almost turns off I got a new relay think that had to be the problem and I found one of the 25 amp fuse to the #2 and #3 fan