Nissan 240SX/Altima 1993-1998 Repair Guide

Drive Train Recommendation



Cooling System

One of the most common, if not THE most common, problems associated with trailer towing is engine overheating. Cleaning and flushing the cooling system is good preventative maintenance. Ensure that all cooling system components are functioning properly. If your vehicle is not equipped with a factory towing package, installation of aftermarket high capacity radiators, high flow water pumps and auxiliary electric cooling fans will all help keeping your vehicle running cool.

Oil Cooler

Aftermarket engine oil coolers are helpful for prolonging engine oil life and reducing overall engine temperatures. Both of these factors increase engine life. While not absolutely necessary in towing a Class I trailer, all vehicles towing Class II and heavier trailers should be equipped with an engine oil cooler. Engine oil cooler systems usually consist of an adapter, screwed on in place of the oil filter, a remote filter mounting and a multi-tube, finned heat exchanger, which is mounted in front of the radiator or air conditioning condenser.


Transmission/Transaxle Cooler

An automatic transmission/transaxle is recommended for trailer towing. Modern automatics have proven reliable and, of course, easy to operate, in trailer towing. The increased load of a trailer, however, causes an increase in the temperature of the automatic transmission fluid. Heat is the worst enemy of an automatic transmission/transaxle. As the temperature of the fluid increases, the life of the fluid decreases.

It is essential, therefore, that you install an automatic transmission/transaxle cooler. The cooler, which consists of a multi-tube, finned heat exchanger, is usually installed in front of the radiator or air conditioning compressor, and hooked in-line with the transmission/transaxle cooler tank inlet line. Follow the cooler manufacturer's installation instructions.

Select a cooler of at least adequate capacity, based upon the combined gross weights of the vehicle and trailer.

A transmission/transaxle cooler can, sometimes, cause slow or harsh shifting in cold weather, until the fluid has a chance to come up to normal operating temperature. Some coolers can be purchased with or retrofitted with a temperature bypass valve, which will allow fluid flow through the cooler only when the fluid has reached above a certain operating temperature.