Heater - Poor Performance
Bulletin 86-1-2Date Feb. '86
Ref. No. 86-063-1
SUBJECT: HEATER PERFORMANCE
MODELS AFFECTED: 1986 SOMERSET & SKYLARK WITH 3.0L MFI V-6 ENGINE (L) 1986 CENTURY WITH 3.8L SFI V-6 ENGINE (3) 1986 LESABRE WITH 3.0L MFI V-6 ENGINE (L) 1986 LESABRE WITH 3.8L SFI V-6 ENGINE (3) 1986 ELECTRA WITH 3.8L SFI V-6 ENGINE (B) 1986 RIVIERA WITH 3.8L SFI V-6 ENGINE (B)
A 195~ thermostat with low bleed rate has been released to improve heater performance during engine warm up. If a comment of slow heater warm up in cold weather is received, install thermostat, part number 3037747. Refill engine cooling system with proper coolant and ensure that all trapped air is expelled. Refer to Service Bulletin 85-1-12 for proper coolant fill procedure.
The low bleed rate thermostat may increase coolant temperature gauge fluctuation slightly on vehicles with gauge.