A/C - Poor Performance/Thumping Noise

Article No.
98-9-11

05/11/98

^ AIR CONDITIONING - POOR AIR CONDITIONING
PERFORMANCE AND/OR "THUMPING" NOISE
FROM AIR CONDITIONING SYSTEM - VEHICLES
BUILT THROUGH 4/15/98

^ NOISE - "THUMPING" NOISE FROM AIR
CONDITIONING SYSTEM - VEHICLES BUILT
THROUGH 4/15/98

FORD:
1998 CROWN VICTORIA

LINCOLN-MERCURY:
1998 GRAND MARQUIS, TOWN CAR

ISSUE
There may be poor A/C performance and/or a "thumping" noise coming from the A/C system on some vehicles. This may be caused by the location of the A/C cycling switch which may cause the switch to cycle too often.

ACTION
Replace the suction accumulator and suction hose assemblies. The new accumulator and hose moves the cycling switch to obtain a more accurate pressure cycle. This should reduce the possibility of a thump and improve A/C performance. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Verify the concern by listening for a thump during A/C compressor engagement and/or install pressure gauges and verify cycle pressures are within specifications with a full refrigerant charge. The switch should cycle off at 23 psi +/- 1.

2. If no thump is present or pressures are within specifications, refer to the appropriate Service or Workshop Manual for additional diagnostic procedures.

3. If a thump is present or the A/C switch cycles off at pressures higher than 24 psi, replace the A/C suction accumulator and suction hose assemblies. Refer to the Service or Workshop Manual for replacement procedures.

PART NUMBER PART NAME

F8VZ-19867-BA Suction Hose
F8AZ-19C836-AA Suction Accumulator

OTHER APPLICABLE ARTICLES: NONE

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

980911A Replace Accumulator And 1.0 Hr.
Suction Line - Includes
Discharge, Evacuate,
Recharge And Leak Check
System

DEALER CODING
CONDITION
BASIC PART NO. CODE
19E561 42

OASIS CODES: 208000, 208200, 208999, 702100, 702300