Quote:
Originally Posted by paul e
There’s another thread in the B58 Turbo Engine section about this, I posted up there but am copying here as I believe it might be of interest:
I had this occur about a month ago, 12k ish miles. SA said to add distilled water, as the antifreeze doesn’t evaporate. I then brought it in, pressure tested, NTF. Both reservoirs were low.
What was funny was that the big tank cap,was a huge PITA to get off, I mean tough to unscrew. When I got it back the cap,was very easy to remove, not sure if it was replaced or what, not listed on the invoice.
I just got back from a 2k miles round trip, and it’s time for an oil change, so before I bring it in I’ll check the reservoirs first.
...ok, I just checked them both, the big one was tough to get off again, but when I finally loosened it, there was a burst of air pressure, so the cap/tank unit had some kind of vacuum. Once it came off it was easy to screw back on and remove again....and it was LOW again, just touching the bottom mark. The little one for the turbo was full.
So I’ll pursue this again, shouldn’t be low after a fresh fill with a 2k miles difference.
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usually oem caps are like that so you can slowly remove the cap and release pressure at the same time (the coolant will be under pressure until it drops to ambient temps). that way you can prevent the cap blowing off if you try to open it while the system is under pressure. it's a safety precaution. you can check the threads to make sure they aren't chewed up and don't have crust on them to be certain.
that being said, wait for the car to cool off before you check the coolant levels. my dealership did the same dance with trying to remove the cap while the engine was still hot, and then ended up overfilling both of my tanks. you won't get an accurate reading until things cool down.