THERMOSTAT
All models use a thermostat that starts to open at 195°F (91°C), and is fully open at 222°F (106°C).
PRESSURE CAP
On "P" Series Motor Homes and some "G" Series Vans with the VIN J 6.2L diesel engine, a de-aeration tank is used instead of a coolant recovery tank.
The de-aeration tank uses a 9 psi (.6 kg/cm 2 ) pressure cap. All other models use a 15 psi (1.0 kg/cm 2 ) pressure cap which should be tested at 14-17 psi (.9-1.2 kg/cm 2 ).
WATER PUMP
Water pump is serviced only as an assembly.
MAINTENANCE
Inspect cooling system every 12 months or 15,000 miles. Drain and flush cooling system every 24 months or 30,000 miles. Maintain coolant level with 50% mixture of ethylene glycol based anti-freeze and low mineral content water in all seasons.
| Application | Quarts (L) | ||
|---|---|---|---|
| 2.5L | |||
| Astro/Safari | (1) 10.0 (9.5) | ||
| S10/15 | 11.6 (11.0) | ||
| 2.8L | 10.5 (10.0) | ||
| 4.3L | |||
| Astro/Safari | (1) 13.5 (12.8) | ||
| "C" & "K" Series | 10.9 (10.3) | ||
| "G" Series | (1) 11.1 (10.5) | ||
| 4.8L | |||
| "C" & "K" Series | |||
| With Air Conditioning | 16.0 (15.1) | ||
| Without Air Conditioning | 15.5 (14.7) | ||
| "P" Series | 13.8 (13.1) | ||
| 5.0L & 5.7L | |||
| "C" & "K" Series | |||
| With Air Conditioning | (1) 18.0 (17.0) | ||
| Without Air Conditioning | (1) 17.5 (16.6) | ||
| "G" Series | (1) 17.0 (16.1) | ||
| "P" Series | 15.5 (14.7) | ||
| 6.2L Diesel | |||
| "C" & "K" Series | (1) 25.0 (23.7) | ||
| "G" Series | |||
| VIN C | (1) 24.0 (22.7) | ||
| VIN J | (1) 25.6 (24.2) | ||
| "P" Series | |||
| Motor Home | 24.7 (23.4) | ||
| All Except Motor Home | 25.0 (23.7) | ||
| 7.4L | |||
| "C" & "K" Series | |||
| With Air Conditioning | (1) 24.5 (23.2) | ||
| Without Air Conditioning | (1) 23.0 (21.8) | ||
| "P" Series | 22.5 (21.3) | ||
| (1) On Astro/Safari, "C" and "K" Series Blazer and Suburban, and "G" Series Van models, add 2.85 qts. (2.7L) for auxiliary rear heater. | |||
| (1) | On Astro/Safari, "C" and "K" Series Blazer and Suburban, and "G" Series Van models, add 2.85 qts. (2.7L) for auxiliary rear heater. |
COOLANT CAPACITY