Heater - Rumbling Noise From Heater Case

Article No.
93-22-15

10/27/93

^ HEATER - "RUMBLE" NOISE FROM HEATER CASE - VEHICLES WITH "HEATER-ONLY" BUILT FROM 8/1/91 TO 1/2/93

^ NOISE - "RUMBLE" NOISE FROM HEATER CASE - VEHICLES WITH "HEATER-ONLY" BUILT FROM 8/1/91 TO 1/2/93

LIGHT TRUCK:
1992-93 ECONOLINE

This TSB article is being republished in its entirety to change the Dealer Coding Basic Part Number.

ISSUE:
A "rumble" noise may be heard on Econolines, equipped with "heater-only" units, when the heater blower motor is running. This occurs because a cavity exists where the evaporator core is normally inserted in A/C equipped units. With the blower operating, a "rumble" noise develops in the cavity on "heater-only" units.

ACTION:
Install a baffle in the cavity to reduce the noise. Refer to the following procedure for service details.

1. Remove the heater blower motor case cover, in the engine compartment, by removing the ten (10) screws securing the cover.





2. Insert the baffle (F3UZ-19A999-A) into the cavity. The two (2) slots in the top baffle flange are on top of the edge closest to the blower wheel and the back flange top hole fits on the guide pin. Refer to Figure 1.

3. Replace the blower motor case cover on the blower motor assembly.

a. Make sure the baffle stays in position.

b. Reinsert the ten (10) screws securing the cover. The blower motor case screws will secure the baffle in position.

4. Make sure that no "rumble" noise exists during blower operation.

PART NUMBER PART NAME CLASS

F3UZ-10A999-A Baffle C

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 93-20-12
WARRANTY STATUS:
Eligible Under Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME
932215A Install Baffle - Econoline 0.3 Hr.
With Gas Engine
932215B Install Baffle - Econoline 0.4 Hr.
With Diesel Engine

DEALER CODING
BASIC PART NO. CONDITION CODE
19B555 56

OASIS CODES:
208000, 208300, 208999, 702300