TSB 64 01 84 (810) P: A/C - Doesn't Cool or Ices Up

Details

84bmw03 Group 64 Heating and Air Conditioning Bulletin Number 64 01 84 (810) Page 1 of 2 Montvale, NJ April, 1984 Technical Dept. Subject: AIR CONDITIONING MALFUNCTIONS Model: 1978 - 1983 733i A faulty evaporator temperature switch can cause one of the following complaints: 1) "Air conditioning doesn't cool" (switch fails to supply electrical current to the air conditioning compressor). 2) "Air conditioning evaporator ices up; vapor mist out of air outlet vents" (switch does not interrupt electrical current to the compressor clutch). The evaporator temperature switch is located on the support stand for the blower motor. Access to the switch is gained by removal of the fresh air intake cowl (at the base of the windshield). The switch should be electrically "closed" at evaporator temperatures above 42~F. The switch should be electrically "open" at evaporator temperatures below 35~F. Should either of the above complaints be caused by a faulty evaporator temperatures switch, both of the corrective measures described on page 2 should be performed. The contact material of the evaporator temperature switch has been changed for protection against evaporator icing. The modified switch is identified by a dot of red or green paint on the bracket mounting bolt. 1. Install a new evaporator temperature switch a) Part Number 64 11 1 369 427 (with red or green paint mark) or b) Part Number 64 11 1 375 911 AND 2. Install compressor clutch diode harness, part number 61 12 4 176 611. This diode should only be installed when a suppresion diode is not found on the compressor or compressor positive wire. The clutch diode harness will not be available until mid-June. Please order your requirements to assist us to determine the necessary stocking level to insure an adequate supply of this item during the summer. NOTE: ALL ORDERS SHOULD BE PLACED V.O.R., WHICH WILL INSURE THAT YOUR ORDER WILL BE FIRST SHIPPED BY AIR FREIGHT PRE-PAID WHEN STOCK IS AVAILABLE. WARRANTY STATUS Parts Warranty: Submit a collective warranty claim for all evaporator temperature switches in dealer inventory, part number 64 11 1 369 427, without red or green paint dot, using the following information: Warranty Type: 2 Defect Code: 64 51 01 12 00 Chassis Number: 2870010 Vehicle Warranty: Parts and labor reimburseable under the BMW Limited 3 year/36,000 Mile Warranty as applicable to each individual vehicle. Defect Code: 64 51 01 12 00 Labor Allowance: Replacing temperature switch : 11 FR Installing compressor clutch diode harness: 2 FR