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1989 Trooper R/S
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4,231 Posts
Russell,
There all all kinds of electric fans. Some are dual fans, others are two speed single
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fans, and others are single speed single fans. Most are set up with a fan switch in the coolant circuit so they will only come on when either the A/C is on or the temp in the coolant system is higher than the setting of the temp sensor. I have an 89 that came from the factory without air and it came with the large plastic fan, a shroud and a fan clutch. One thing to check is to make sure you have at the least a 2 row radiator. I do know some of the early Troopers without air came with a single row radiator and a small 4 bladed fan. My temp never goes above half and I'm in Texas where it's over 100 lots of the summer days. If you install an engine drivin fan I would get the large fan, a shroud and fan clutch, and make sure your radiator is at least a 2 row.
 
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1989 Trooper R/S
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4,231 Posts
Would like to add this bit of fan info in case you do go with the engine drivin fan. Proper positioning of the fan in relation to the shroud is important.. Fan should be about half way into the shroud for max benefit. I noticed at a recent car show that many of the conversion engines had there fans improperly positioned for max air flow through the radiator.

 
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