coolant leak

So I pressurized my system with a tester to 10psi. Isolated cab heater supply and return valves. Lost 2 psi in 20min and 3 psi in 40min. I could not see any leaks anywhere. Satisfied I had a minor leak I removed test apparatus. It took 1 gallon to get back to full after the test!:facepalm: The...

Skoolie Fam! Looking for some help diagnosing this problem before I rush out to the mechanic to open my wallet. While working on the bus today I noticed a mysterious, and sudden(?) coolant leak! There is a pretty good drip going, all clean coolant. Maybe 1 drip per minute? I haven't...

Any idea the source of these stains underneath? Is it coolant or oil? Could this mean a big expenditure? 5 window short bus gmc 6 L gas engine

Hi :) I recently had a coolant leak during a trip. We had stopped for dinner and an hour later walking back towards the bus, the coolant was gushing out. It was night and I couldn't see where it was coming from. We had to tow about 400 miles. I have run the engine and have my seen any liquid...

Greetings bus gurus! My 5.9 developed a coolant leak last weekend, and I'm looking for some advice/expertise. I have attached a few photos for reference. [/IMG] At first I thought (was really hoping) the leak was just the 90 hose at the thermostat housing, but I have replaced that to find out...