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This is a 2015 Jeep which has the cap directly on the radiator, and uses an unpressurized overflow bottle. I pressurized the cooling system at the radiator neck after disconnecting the hose to the overflow bottle.

I did 4 back to back pressure tests to 18 psi on the system for about 2 minutes each with the overflow tank hose disconnected, and the coolant level was down at the bottom of the filler neck each time I removed the pressure test tool. I added about 1 ounce of coolant to refill the radiator...

I haven't pulled the plugs yet because it's a bit of a job to take off the intake plenum. This would be my next step if I can't find another resolution.

No need to waste time and money washing your undercarriage ever again if you apply a lanolin undercoating product like Woolwax once a year. You get full protection against corrosion from salt and brine without doing anything else, and washing the undercarriage actually degrades the performance...

I replaced the cap about a year ago with a new Mopar cap, and it just passed a pressure test.

I didn't notice any coolant residue on any of the hose ends, and the coolant level will also drop when the engine is cold without a heat/cool cycle if the cooling system is pressurized.

Yes I vacuum filled the cooling system, then did additional purging to get the air that remained with a spillproof funnel. I usually open/close the bleed screw after each cycle with the funnel. Overflow tank level isn't abnormal, it rises as the engine heats up and then goes back down as it cools.

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My coolant level will drop to the bottom of the radiator neck after using the pressure tester to pressurize the system to 18 psi for a couple minutes. The radiator cap isn't installed during the test, so that would rule it out as the root cause. I also replaced the original radiator cap with a...

Well I'm not sure if it's leaking internally, or if it could be a deep airlock that is compressing/getting partially pushed out each time I pressurize the system. I am doing another funnel bleed, but am noticing that some air bubbles start coming up around 215F. From what I remember the last...

I thought I looked pretty closely. I sprayed the tank seams on both sides of the radiator, the area around the filler neck, the petcock, and the inlet/outlet nipples with soapy water while pressurized to 18psi. I didn't see any bubbles forming or any liquid coolant seeping out.

Whats odd though is that I will lose the approximate 1 ounce of coolant in around 2 minutes of pressurizing the cooling system with a Stant 12270 pressure tester used on a cold engine. I would think it would take a significant head gasket leak to push that much coolant into a cylinder in that...

The pump is externally mounted, but I can't see the weep hole because I think it's behind the serpentine belt pulley. I was underneath the vehicle and didn't see any evidence of coolant residue on the housing below this area though.

I haven't got to that point yet, but I did check the dipstick after running the engine and there is no evidence of coolant on it. If the pressure tester pushed a few ounces of coolant into one of the cylinder's, I would think this would work its way past the rings to the sump and be visible on...

Yes I know its an issue because I monitor the coolant closely and it never dropped like this before in the radiator. Something occurred after my last servicing to cause this, and I want to get to the bottom of it. I pulled a deeper vacuum 29.25" on the system with a modified Airlift vacuum...

Because I want to solve the issue before it gets to that point.

I had the overflow tank hose removed and the nipple on the radiator neck plugged when I was pressurizing the system with the pressure tester, so I know the coolant wasn't escaping to the overflow tank. Prior to this issue starting a few weeks ago, the coolant level would always be touching the...

Thanks for the reply. That article says the issue is the oil cooler assembly, but I just replaced that with a new Mopar unit about 12,000 miles ago and there is no leakage in the valley. I snaked a digital borescope in from the back and on both sides of the oil cooler from the front, and it's...

Woolwax applied to the undercarriage and body/frame internal cavities once a year.

Recently I have found that the coolant level in my 3.6L Pentastar is always about 1/2"-3/4" low near the bottom of the radiator neck if I check it when the engine cools down after driving the vehicle. If I fill it back up until it touches the bottom of the radiator cap, the level goes back down...