There are several things to remember when removing and refitting an Isuzu radiator.
The first is the fragility of the unit. Most modern Isuzu radiators are made from an aluminium centre core capped on both ends with plastic tanks.
The Isuzu radiator plastic end tanks are also fairly fragile and great care should be taken to not knock the plastic locating pins.
NEVER remove an Isuzu radiator cap from an Isuzu radiator expansion tank or Isuzu radiator whilst the engine coolant is still hot. Great pressure can build up in some Isuzu radiator systems and the fitter must be sure that the engine and it's cooling system have had sufficent time to cool.
If your Isuzu radiator is of copper and brass construction be careful not over tighten any threaded fittings such as the hole for the Isuzu radiator fan switch. The fittings are only soft soldered into the Isuzu radiator tank and can easily be broken if over tightened.
If your Isuzu radiator has an inbuilt oil cooler with threaded fittings for the pipes ensure they are not cross threaded when attaching.
Always, always, always replace the anti freeze solution when refilling the Isuzu radiator. The antifreeze also acts as engine coolant as it has a higher boiling temperature than water. Aways use the manufacturers recommended soultion and observe the correct ratio of water to anti freeze.
When you are confident that the Isuzu radiator is fitted correctly and all pipes are sufficently tightened you will need to run the engine until it gets warm enough for the thermostat to open and circulate the water through the entire system. It is ESSENTIAL to remove any trapped are from the Isuzu radiator cooling system as air expands greatly and can blow an Isuzu radiator from the pressure build up.
It is advisable to set the heater temperature control to HOT as this will allow water to circulate through the unit. Do not switch the fan on as this will only slow the process of heating the system.
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