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Looks like I may need to get a loaner pressure testing kit from one of the auto parts chains. I recall reading here in past years that some have the correct adapter for the DII and some do not. Does anyone have experience with them to know which kit from which chain works on our trucks? I have the usual chains here - Advance Auto, AutoZone, O'Reilly's and NAPA. Thanks.
Well, that was easy. Like Sandman614 said, it's the #5 adapter marked for BMW that fits. I knew the leak was from around the coolant reservoir based on where I saw coolant on the ground. I removed the tank yesterday and inspected it but couldn't see where it might be leaking plus the hoses looked good. I'd expected to find the nipple for the hose that goes to the throttle body heater had cracked like last time but that wasn't the case. Instead I found a very small crack in an area that has no stress spraying a fine fan-like stream of coolant when I pressurized the system. You can barely see the crack within the oval in the pic. At least it's an easy fix.
Well, that was easy. Like Sandman614 said, it's the #5 adapter marked for BMW that fits. I knew the leak was from around the coolant reservoir based on where I saw coolant on the ground. I removed the tank yesterday and inspected it but couldn't see where it might be leaking plus the hoses looked good. I'd expected to find the nipple for the hose that goes to the throttle body heater had cracked like last time but that wasn't the case. Instead I found a very small crack in an area that has no stress spraying a fine fan-like stream of coolant when I pressurized the system. You can barely see the crack within the oval in the pic. At least it's an easy fix.
This happened to my Britpart tank, so I upgraded to an allisport, unfortunately couldn’t wait for ABran’s unit with sightglass. Should have kept my original one, it was fine, learning not to throw anything away.....
The truck has continued to lose coolant, although at a slow rate, so I used the pressure tester again yesterday. I pumped it up to 20 psi this time, and after an hour the reading was 17 psi but I couldn't find any leak. After an hour should it have held at 20 psi, or is leaking down to 17 psi stlll "normal"? I can't figure out where the coolant is going, and no, I don't have any reason to think it's a cracked block leaking internally (no evidence of water in the oil). Any thoughts? Thanks.
The truck has continued to lose coolant, although at a slow rate, so I used the pressure tester again yesterday. I pumped it up to 20 psi this time, and after an hour the reading was 17 psi but I couldn't find any leak. After an hour should it have held at 20 psi, or is leaking down to 17 psi stlll "normal"? I can't figure out where the coolant is going, and no, I don't have any reason to think it's a cracked block leaking internally (no evidence of water in the oil). Any thoughts? Thanks.
It should hold. I had a cracked Britpart Elbow pipe that would only leak when hot, not saying that is it, but that could be a factor. Maybe keep a flashlight in the door, and when warm look for seeping. It will evaporate right off, and easy to miss.
Maybe move to compression test to make sure it is not the head gasket, but that is not the most likely culprit IMO. Could just be a loose hoseclamp, etc.
No codes and temps are great so long as there's coolant in the reservoir (188.6° when rolling, sometimes dropping a little lower, and 194° to 198° or so at stoplights, sometimes climbing a little higher).
How much do you lose? I’d leave the gauge hooked up all day, it seems like you will find your leak eventually. Also see how much your pressure drops after a few hours. It’s probably just a hose clamp. The gauge may also leak some air at the connection to the testing cap too, so make sure it sits straight and snug on the cap
Coolant System Pressure Test Kits
