quote:

ORIGINAL: Dman98

I did the viper fan upgrade and have no cooling problems. The viper fan is a two speed fan, in my installation I only use the low speed and the high is wired for emergency use via a cabin mounted toggle switch. I used the fan with the a/c on in 95 degree weather, with no problems at all and idling the temp stayed at 188. I upgraded to a 165 amp alternator, the optima yellow top the largest that would fit and this was done because of my stereo system. I don't tow, if I did I'd use the same or use the high speed only which ever works best.

quote:

ORIGINAL: CESSPOOL
Sam,

I'm looking at "other" cooling options for my '99 Durango with a 5.9L.  I'm considering the viper fan 2 speed complete kit you have on the website for $440.  Do you know how much CFM this fan moves compared to the stock clutch fan?  I do a decent amount of towing with my camper or boat.  I have been told that I need to be careful with going electric due to the strain the towing puts on the engine and making sure I get enough air movement.  I would like to have the electric fan for the MPG/H.P. increases, but they do me no good if I overheat.  I will be putting a HD clutch on the fan if I have to, but want to check with you first.  The elec will obviously be quiter, but I know the HD clutch will get the job done.  I don't really have any issues now, especially once I get on open road, but the stop and go with the camper/boat until that point will run me a bit warmer than I like, around 200 degrees.  Which is where the High Speed would really come in handy I would assume.  It isn't really an issue at all in the cooler months, but right now we are 90-95 degrees in Cincinnati, Oh area.  I am going on a 4 hr trip in july and would expect about the same and I NEED to have something done.  We are going to TN, and it will be hilly, hot and a 4 hr trip.

Please let me know ASAP.  I saw on your site there is a 2-3 week lead time on orders, and My trip is just over a month away.

Thanks for all your help,

quote:

ORIGINAL: SoCalDak
Phil, the viper fan should do well, on a 99-- the fan is controlled by a temp controller (adjustable) to switch between hi and low speed... you should run about the same when under load as you would with a clutch fan-- and in 'traffic' actually run cooler due to the higher air volume the fan will produce.

I think it would work fine for your setup... I've got hundreds of these all over the world (a Durango in Kuwait City, Kuwait runs one-- and he's in 120 F heat-- and says that it works about as well as anything considering the conditions.)