Radiator and A/C Condensor

Figure 3:

Verify that the radiator is correct for the engine and application. There is a two letter radiator production code located on the right radiator tank (Figure 3). The service parts books (Group 1.219) have a chart to convert these codes into service part numbers and then to applications.

DIAGNOSIS

Check for visible signs of coolant leakage. Often when a leak is present, there will be a slight buildup of a powdery residue in and around the leak.

Check for distortion of the radiator cooling fins on both sides of the radiator. To check both sides thoroughly may require the removal of the radiator from the vehicle. Bent or damaged fins reduce the cooling system performance.

Check for air flow restrictions within the radiator cooling fins. Often when vehicles are used in dusty or off-road conditions, the cooling fins become plugged with dirt, grass, insects and other types of debris. If 25% of the radiator cooling fins are restricted, then the radiator is only operating at 75% efficiency.

Check the condition of the radiator on the inside. As vehicles start to accumulate miles, the possibility of the radiator core becoming plugged increases. Having the radiator boiled out doesn't always correct this condition. If the radiator is suspected as being plugged, remove it from the vehicle, have the tanks removed from the core, and have the core rodded out.


RADIATOR CAP


Check that the radiator cap is correct for the application. Check the operation of the cap by pressure testing with cooling system pressure tester J24460-01. Replace cap if 15 psi cannot be maintained.


CAUTION: THE RADIATOR CAP SHOULD BE REMOVED FROM A COOL ENGINE ONLY. IF THE RADIATOR IS REMOVED FROM A HOT COOLING SYSTEM, SERIOUS PERSONAL INJURY MAY RESULT.


AIR CONDITIONING CONDENSER


With the engine off, check for distortion of the condenser cooling fins on both sides of the condenser. To check the side closest to the radiator, remove the upper fan shroud, and tilt the radiator towards the rear of the vehicle. When performing this procedure, check for air flow restrictions within the condenser cooling fins. Like the radiator fins, the condenser fins can also become plugged by debris.


This not only affects the air flow going to the radiator, but also reduces the performance of the air conditioning system. If possible, clean both the radiator and condenser cooling fins with pressurized tap water (garden hose).

AIR CONDITIONING SYSTEM


Check that the air conditioning system is not overcharged. An overcharged system will cause excessively high system pressures. These higher pressures relate to higher temperatures in the condenser. As a result, the air flow moving across the condenser to the radiator is warmer than normal. This warmer condition reduces the ability of the radiator to dissipate its own heat.