Thunderbird L4-140 2.3L SOHC Turbo (1984)
Drive Pulley: All Technical Service Bulletins
A/C Compressor Drive Belt - Rumble Noise
Article No. 86-3-7
AIR CONDITIONING COMPRESSOR DRIVE BELT RUMBLE NOISE - VEHICLES WITH 2.3L STANDARD AND TURBO ENGINES
FORD 1983-84 MUSTANG, THUNDERBIRD, LTD
LINCOLN-MERCURY 1983-84 CAPRI, COUGAR, MARQUIS
During A/C operation at vehicle engine speeds between 1100 and 1500 rpm, an objectionable rumble noise may be heard from the engine compartment
on the subject vehicles.
If a vehicle with this condition is encountered, replace the existing A/C compressor mounting braces with new design mounting braces and install a new
water pump pulley and A/C compressor drive belt. This repair also requires rerouting the heater and oil cooler tubes and hoses.
Testing
1.
Start the engine and accelerate the engine to speeds between 1100 and 1500 rpm. With the air conditioner operating, verify the rumble noise
condition.
2.
If the rumble noise occurs, switch the A/C to "off" and verify that the noise does or does not stop.
A.
If the noise does not stop with the A/C off, refer to the Noise, Vibration and Harshness Diagnosis (NVH) located in Group 18 of the 1983
Shop Manual.
B.
If the noise stops with the A/C off, continue to Step 3.
3.
Replace the designated A/C compressor mounting braces with the new design braces. Install the new water pump pulley and A/C compressor drive
configuration and reroute the heater tubes.
For additional information, refer to the following procedure.
