1994 Ford Explorer - The other day I noticed a small coolant leak. Turns out it was just a loose hose clamp. So I tighten the clamp and use my coolant pressure tester to make sure the leak is gone. So now there are no more leaks but the system will not hold pressure at all. As soon as I pump it up to 16 lbs, the needle on the gauge immediately starts plummeting back down to zero. With a leak that big, I should see a huge puddle of coolant on the ground, but there are NO leaks anywhere. And yes, my tester is working correctly. I tested it on my Accord (and discovered a loose clamp on that car too, fixed that) and the tester worked perfectly.
I listened carefully to hear any hissing or escaping pressure and thought I heard something from around the passenger side cylinder head area. It’s hard to listen because there’s a small window of time to listen before the pressure drops to nothing. The sound almost sounded like a dripping noise. It was a very faint noise; I had to pull the truck into the garage and close the door so I could get dead silence in order to hear anything.
The truck runs perfectly and doesn’t overheat, no misfires, good power, etc. The only thing I can think of is a bad head gasket. I’m thinking of buying a coolant combustion leak tester and/or a compression tester and/or a leakdown tester.
I listened carefully to hear any hissing or escaping pressure and thought I heard something from around the passenger side cylinder head area. It’s hard to listen because there’s a small window of time to listen before the pressure drops to nothing. The sound almost sounded like a dripping noise. It was a very faint noise; I had to pull the truck into the garage and close the door so I could get dead silence in order to hear anything.
The truck runs perfectly and doesn’t overheat, no misfires, good power, etc. The only thing I can think of is a bad head gasket. I’m thinking of buying a coolant combustion leak tester and/or a compression tester and/or a leakdown tester.
