charleskh
- - -
I wanted to document this some where so why not here?
Backstory: After installing my remanufactured 400/6.6 I had running-hot issues when doing very basic wheeling in the summer up Santiago mountain. The troubleshooting and attempted solutions were many and among them was installing a big 'ol electric fan with a PWM controller. The other set ups using relays or other controllers aren't very reliable. With the PWM controller it only runs as fast as it needs to but can be overridden.
In the end, my running-hot-issues ended up being due to an incorrectly set-up EGR system which = running lean with the stock 2150 carburetor. The truck is a whole lot quieter with this fan in it, engine bay is a lot spacier.
Anyway, I researched the hell out of this and I wanted to buy everything new/didn't have time to run around the junkyards. The fan I purchased isn't actually a MKVIII fan but it is an aftermarket replacement which has been tested to have comparable CFM:
Dorman 620-118 (on Amazon)
Needs this pigtail harness (on Amazon)
You'll need to get shorter bolts for the water pump pulley: 5/16"-24"x1 (I went with flanged head bolts)
For the controller I went with autocoolguy's 85 PWM which was probably overkill and you could go with a different model from him: (autocoolguy.com)
BTW: this guy's website is a bit insane, on every page you need to scroll to the bottom to get to the content. With that said, he is very responsive to email and ships quick (right here in CA). Makes a great product.
It was a very easy set-up (the controller comes with instructions) but there was a lot of pre-requisite work:
- 3G alternator install
- Build a mount for the fan
I have a Champion 3-core aluminum radiator which has a bracket on both the engine and grill side so I used angle-iron to fab up a mount to attach to the fan. Since the fan has an integrated shroud I didn't have to worry about encasing it:
Laying it out for mock-up:
The mounting surfaces on the integrated shroud are at a couple of different heights so a lot of time with clamps, magnets, and measuring tape to get it right..
All done building the brackets:
Backstory: After installing my remanufactured 400/6.6 I had running-hot issues when doing very basic wheeling in the summer up Santiago mountain. The troubleshooting and attempted solutions were many and among them was installing a big 'ol electric fan with a PWM controller. The other set ups using relays or other controllers aren't very reliable. With the PWM controller it only runs as fast as it needs to but can be overridden.
In the end, my running-hot-issues ended up being due to an incorrectly set-up EGR system which = running lean with the stock 2150 carburetor. The truck is a whole lot quieter with this fan in it, engine bay is a lot spacier.
Anyway, I researched the hell out of this and I wanted to buy everything new/didn't have time to run around the junkyards. The fan I purchased isn't actually a MKVIII fan but it is an aftermarket replacement which has been tested to have comparable CFM:
Dorman 620-118 (on Amazon)
Needs this pigtail harness (on Amazon)
You'll need to get shorter bolts for the water pump pulley: 5/16"-24"x1 (I went with flanged head bolts)
For the controller I went with autocoolguy's 85 PWM which was probably overkill and you could go with a different model from him: (autocoolguy.com)
BTW: this guy's website is a bit insane, on every page you need to scroll to the bottom to get to the content. With that said, he is very responsive to email and ships quick (right here in CA). Makes a great product.
It was a very easy set-up (the controller comes with instructions) but there was a lot of pre-requisite work:
- 3G alternator install
- Build a mount for the fan
I have a Champion 3-core aluminum radiator which has a bracket on both the engine and grill side so I used angle-iron to fab up a mount to attach to the fan. Since the fan has an integrated shroud I didn't have to worry about encasing it:
Laying it out for mock-up:
The mounting surfaces on the integrated shroud are at a couple of different heights so a lot of time with clamps, magnets, and measuring tape to get it right..
All done building the brackets:
