gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

All Technical Service Bulletins for Heater Core: > < Compressor Clutch Relay|Locations
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Heater Core: Customer Interest
A/C - Insufficient Heat

GMC NUMBER:

88-T-69

GROUP:

1A - Heating and Ventilation

DATE:

January, 1988

CORPORATE
NUMBER:

861102

SUBJECT INSUFFICIENT HEAT

MODELS:

1985-1988 M VANS

A new heater core to improve heater performance has been developed for 1985 - 1988 M Vans. The new heater core, P/N 52451085, has more fins per
inch and will increase outlet temperatures up to four degrees fahrenheit. The new core will fit into existing heater assemblies without any modifications.
To install the new core, follow the instructions for heater core replacement found in Section 1A of M Van

Service Manuals. The new heater cores were incorporated into production beginning with VIN breakpoint JB 511288.

Labor OP:

D2820

Time:

1.3 Hours

All Technical Service Bulletins for Heater Core: > < Compressor Clutch Relay|Locations