Honking/Hooting from A/C Expansion Valve
Group 64Heating and
Air Conditioning
Bulletin Number
64 01 94 (4956)
Woodcliff Lake, NJ
October 1994
Product Engineering
SUBJECT:
Honking/Hooting from Air Conditioning Expansion Valve
MODELS:
E34, E32, E36 from 9/92 to 4/94 production
Situation:
Complaint of intermittent loud honking or hooting noise from A/C expansion valve.
Affected Vehicles:
E34 vehicles equipped with R-134a A/C refrigerant (since 9/92 production). In addition, we have received a few complaints with E32 and E36 vehicles. The new expansion valve was incorporated into production on E34 vehicles as of 4/94.
Cause:
Expansion valve can be excited into resonance under certain operating conditions.
Solution:
If a customer complaint of honking or hooting from the A/C is encountered, replace the expansion valve with P/N 64 11 8 362 851. This unit employs a friction damper to prevent the valve from resonating.
Parts Information:
Modified Expansion Valve w/Damper - P/N 64 11 8 362 851
Warranty Status:
Parts and labor are reimbursable under the terms of the applicable BMW New Car Limited Warranty.
Defect Code: 64 51 12 39 00
Labor Operation: 64 50 009 Recover & Recharge Refrigerant
Labor Allowance: 14 FRU
Labor Operation: 64 51 520 Replace Expansion Valve
Labor Allowance: Refer to appropriate Flat Rate manual