Note on engine oil cooler - AH18.30-P-0001-01A
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Engine 606.961
ENGINE 606.961 in MODEL 140.135 1#
Model 140.135 vehicles must be equipped with an additional blower for the given air/oil cooler when a trailer hitch is installed.
This should help to prevent any damage through overheating.
The wiring harness and temperature switch on the body are also available in all vehicles. The connections are strapped back behind the left headlamp.