Cooling System - Coolant Leak Near Expansion Tank

Group 17
Cooling System



Bulletin Number
17 01 92 (3608)



Woodcliff Lake, NJ
August 1992
Product Engineering



SUBJECT:
Radiator Expansion Tank Seals

MODELS:
E30 and E36 with M42 Engines, E34 with M20 or M50 Engines

Situation:
An evaluation of radiators which have been returned to the Warranty Parts Return Center for leaking complaints has indicated that many of the leaks occurred at the sealing O-rings which seal the coolant expansion tank to the radiator body.

Correction:





If a coolant leak is detected in the area of the coolant expansion tank, it should be removed from the radiator as outlined in the appropriate repair manual and both sealing O-rings, P/N 17 11 1 712 966 (small round O-ring) and 17 21 1 712 965 (large rectangular O-ring) should be replaced (see illustration).

Warranty
Information:
Covered under the terms of the BMW New Car Limited Warranty.

Defect Code:
17 11 00 48 00
Labor Operation:
17 11 100
Labor Allowance:
7 FRU

Note:
Warranty claims for radiators found to be leaking from the sealing O-rings described in this Service Information Bulletin will be rejected and the parts returned the dealer.