Most C/K-Models use a spring-type clamp at the radi ator hose connections. When this type of clamp is used, the radiator hoses should be installed on dry, non-painted surfaces to ensure proper sealing. Reusing the spring-type clamps on aftermarket hoses is not recommended. 4.3L ENGINES Remove or Disconnect (Figure 10) • Drain the cooling system.… Read More »
Remove or Disconnect (Figures 8 and 9) 1. Coolant from the recovery tank. 2. Clamps. 3. Coolant recovery reservoir hose from the recovery tank. 4. Overflow hose. 5. Bolts. 6. Coolant recovery tank from the vehicle. Install or Connect (Figures 8 and 9) 1. Coolant recovery tank to the vehicle. 2. Bolts. Tighten • Bolts… Read More »
Various methods and equipment can be used to flush the cooling system. If special equipment such as a back flusher is used, follow the equipment manufacturer’s instructions. N O T IC E : If the engine is damaged internally and a new engine assembly is in stalled in the vehicle, makesure all foreign material is… Read More »
Draining 1. Place a drain pan under the radiator drain cock. 2. Install a tube on the drain cock. 3. Place the end of the tube in the pail or pan. 4. Make sure the cooling system is cool, then remove the radiator cap. 5. Open the drain cock completely. 6. Let the cooling system… Read More »
Drive belts and pulleys wear evenly with use. Unusual signs of wear indicate some correction is needed. The following diagnostic chart will aid in diagnosing multiple ribbed belt system problems. DEFINITIONS: Chirpings : Chirping is a high pitched noise that is usually heard once per revolution of a pulley or belt. It is also usually… Read More »
DIESEL ENGINES The coolant level indicator circuit is shown in figure 7. Indicator Lamp Will Not Illuminate 1. Turn the ignition switch to the “ON” position. • If the lamp illuminates, the lamp is OK and the connector is properly installed on the module. Go to step 2. • If the lamp does not illuminate,… Read More »
PROBLEMS Problems Not Requiring Disassembly of the Cooling System 1. Remove large obstructions (equipment not approved by GM) blocking the radiator or condenser. • Auxiliary oil cooler(s). • License plates. • Spare tires. • Ice, mud, or snow obstructing the grille. • Fog lamps. 2. Engine oil is overfilled. 3. incorrect radiator for the application.… Read More »
HYDROMETER Due to changes in commercially available antifreeze, the use of a hydrometer may give an incorrect reading. The hydrometer should be used to test ethylene glycol base an tifreeze only. Ethylene glycol base antifreeze is recommended for year round use. COOLANT TESTER Coolant testers J 26568 (Centigrade Scale) and J 236 88 (Fahrenheit Scale)… Read More »
NOISE Fan noise is sometimes evident under the following normal conditions. • When the clutch is engaged for maximum cooling. • During the first 15 seconds to one minute after start-up until the clutch can re-distribute the silicone fluid back to its normal disengaged operating condition (after overnight settling). Fan noise or an excessive roar… Read More »
DRIVE BELT – MULTIPLE RIBBED BELT Check the drive belt for looseness, damage, or fabric delamination. If the belt is loose, check the belt tensioner for proper operation. The belt tensioner is not adjustable. If it is not working properly, it must be replaced. If the belt is delaminated or damaged, replace it. Important •… Read More »