Heater - Poor Performance
Number 86-1-1 Date 3/86Subject: HEATER PERFORMANCE
1986 GRAND AM WITH 3.0L MFI V-6 ENGINE (L)
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 85-1-5 for proper coolant fill procedure.
The low bleed rate thermostat may increase coolant temperature gauge fluctuation slightly on vehicles with gauge.