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I don't know about the bump thing, but,d oes your 97 have a sight glass on top of the reciever dryer?
The sight glass is no larger than a pencil eraser, and would be located on top of a tank, between the front of the fender well, and the driver side head light.
If you find it, Clean it good, use a flashlight, and see if you can see any bubbles when the car is at idle. It should be totaly clear. check it idling and at about 2000 rpms.
If you can see the freon moving through it, at any rpm, it indicates low charge.
If it is low, and you charge it yourself, don't make the common mistake of overcharging it.
Too much is worse than not enough.
Stop adding refrigerant as soon as the sight glass is totally clear.
Drive it and check it again.
Add a little if needed.
Hope this helps,
Good luck
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74 911 targa blk on blk, Carrera fend., tires & whls. gone, missed
85 325e bought new, totaled after 20 years & 465K miles, trouble free service.
01 Ford Ranger 4dr stpsd 4wd. I drive,here
88 325i convert. only 98k miles,gone, sold
93 325i.here, 98 Z-3 roadster. gone, 08 128 cabro gone
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