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Isuzu Rodeo Engine >> OVERHEATING PROBLEMS


Engine Overheating Problems On
1989 Isuzu 2.6L Engines

AERA machine shops have reported engine overheating problems on 1989 Isuzu 2.6L engines used in Troopers and Pick Ups. Though the cooling system was filled during engine installation, the overheated engines have a low coolant level when inspected. Before disassembling the engine, consider that the cooling system may not have been properly filled during installation.

Isuzu recommends the following fill procedure:

1) Make sure that the thermostat jiggle valve is positioned at the top of the
thermostat housing (Figure 1).

2) Remove the thermal valve from the thermostat housing. Remove the radiator
cap and set the temperature control lever to the highest heat position.

3) Fill the cooling system until coolant flows from the thermal valve opening.

4) Apply a thread locking compound to the thermal valve and install it into the
thermostat housing. Finger tighten the valve using the metal housing. Rotate
the valve one additional revolution and align it as show in Figure 2 below.

5) Start the engine and let it reach normal operating temperature. Check the
coolant level in the radiator and refill as necessary. If no air bubbles are
present in the filler neck, install the radiator cap.

The AERA Technical Committee
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