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View Full Version : Need help! Failing Coolant Pressure Test



3.0ss
01-07-2021, 10:45 PM
Update: Found the problem, it was the Merc bleeder screw. Apparently it ships not fully tightened and I did not know that, tightened the screw and now I'm holding pressure!

Can anyone point me where to look/check for leaks as I'm trying to vacuum all the air out of my coolant system with a vacuum filler off Amazon and as soon as I turn off the suction it immediately starts to loose pressure until it drops back down to 0 in a matter of minutes. I just replaced my PCV, water pump, tstat, coolant pipe under sc, front coolant pipe gaskets, and installed a Merc HX. I triple checked all hoses, pipes, screws, everything to make sure it was all fitted properly and it still will not hold pressure. I just spent a few days replacing all of this stuff and right now I feel like setting my car on fire lol! I spent the last few hours googling trying to figure out where the air might be getting into the system from but I am stumped. Any help would be appreciated, thanks! [headbang]

DarrenOman
01-08-2021, 11:30 AM
Glad you figured it out. Good to know about the bleed screw.

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