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Hi Peter, here are some notes on how I did this. I assume you are talking V4 and are familiar with cutting off the fan bearing nose on the front cover. Seal the hole with a freeze plug. For the fan I found one from a Datsun, but was recently working on a 97 Subaru Legacy Outback, 2.5L engine, and it appeared that the driver's side fan (the larger of 2) would fit very well, same thickness but better coverage of the radiator surface. The radiator has to be remounted, I believe mine is in the same place at the top but the bottom is swung a couple of inches forward. For the fan switch, I got two copper plumbing bushings threaded on the inside for 1/2" pipe, the outside plain intended to solder into a pipe fitting, and had the radiator shop solder them into each side tank on the radiator, there is a place on each tank that looks like it is intended for the use. I did this so I would have a choice of controlling the fan from the hot side or cool side of the radiator in case I needed to experiment to get the right on-off point. Ended up using the fitting on the driver's side, (inlet or hot side) and plugged the other. The switch itself is a Chrysler part with a switch point around 175F sorry I don't have the part number accessible, will try to find and post later. An alternate way to mount the fan switch that is easier is to put a copper tee into the upper hose, probably 1-1/4", with a threaded bushing in the side outlet for the switch.
With the radiator relocated the stock u-shaped lower hose no longer fits. I had the radiator shop solder a coppper elbow on to the down-pointing lower radiator nipple so it points back toward the water pump. Two short sections of straight hose, four clamps, and another elbow make the tight 90 bend to complete the lower hose. Clearance is tight, it took some care to get the hose routed just right.
If you have cooling problems this will not fix them. The main benefit IMHO is reduced accessory drag on the engine (= better MPG) and less fan noise. At highway speeds, where my 95 runs out of cooling capacity on a hot day, you have more airflow through the radiator than the fan can ever provide and it is irrelevant. At idle the fan turns on when the temp needle tip moves maybe 1/4" to the right and stays on until it drops a little left of straight up. Hope this is of interest, K
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