would air in the water pump line make a sound like someone knocking on a door? on 1998 BMW 328i

please excuse my inability to use car technicial terms, I'm just a college student with very little knowledge of how my car works. I am very thankful for anyones help since I live on a college students budget.

by in Petaluma, CA on January 06, 2012
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3 answers 3 comments
ANSWER by , January 07, 2012
Most likely Not, No. The noise im betting your hearing is your fan running into something.
COMMENT by , January 14, 2012
thanks so much for the response and suggestion. I will have someone check it out for me!
ANSWER by , January 07, 2012
Nope, not going to be in the cooling system. Check all your fluids and pay special attention to the plastic fan. Make sure it is not rubbing or missing blades. We are the large BMW shop in Vallejo. I already replied to the fog light question. Call Adrian at Milt's Service Garage for more info (707)643-7548
COMMENT by , January 14, 2012
Once again I appreciate you responding to my questions with patience and good suggestions!
ANSWER by , January 08, 2012
What you are discribing is anything from a rod or crank bearing problem to a broken exhaust mount. Take it in and have it checked.
COMMENT by , January 14, 2012
I truly appreciate your response and advice. I will take your advice and have someone check the issues you suggest it might be!