I just discovered that I have a blown intake manifold gasket on my 2004 blazer (overheats, stalls intermitently, coolant in oil,but no oil in coolant) I did a block tester just to be sure it was not a HG. I wanna dive into the replacement but I am not sure if I should do a cooling system flush now or after I replace the IM gasket.


-also, when doing a block test I get a slightly blue green result but not really green or anywhere near yellow, is this a cause for concern or nothing at all?

Thanks in advance for any info, please feel free to elaborate as much as needed.

 

IMO i think the block test will be fine. If it is overheating and stalling i would not drive it at all. that means it is getting hot enough that it is actually shutting itself down. my advice: park it, replace the gaskets, flush the system.

 

What he said, but drain the oil now........u don't want antifreeze in your oil ....it'll wreck havoc on the bearings in that motor!!!! Your $200 repair will soon turn into a $2000.00 repair!!!!!