E-FAN Taurus Fan and other 2 speed fan setup
#13
That looks good, I didn't realize you had a 2 temperature thermal switch doing your Hi/Lo switching for you. That setup should work pretty well for you, the only thing I'd do would be to add some back EMF protection (this is caused by the collapsing field on inductors such as electric motors, solenoids, relays, etc.) to make sure you don't have the possibility of a huge spike damaging any critical electronics downstream from the inductor. I'll have a look at your wiring diagram sometime this week and mark it up showing some suggested protection (should be just some diodes).
#14
#15
Join Date: Jan 2011
Location: Sandy, UT. (SLC Suburbs)
Posts: 2,063
Likes: 0
Received 5 Likes
on
5 Posts
In the past I've used some coolant plumbing adapters for things like thermal switches and sensors - they look like you see in this link, it fits in-line with your hose (cut the hose, insert this adapter in between the 2 halves) and comes in a variety of taps that you can put the switch/sensor into (I've normally used 3/8NPT since the largest variety of switches were available in that size).
But one doing this swap has the choice of an inline adapter, that they will probably have to retap to metric thread, or the retapped bushing using the spare 3/8th npt test port. Unless they choose to use the double switch method, and a double inline adapter like this one:
Though Hollister offers a more affordable one here:
http://www.hollisterroad.com/proddet...Adaptor_Double
The problem with this is that the low switch will stay on while the high switch is on if the temps get up there. I don't think that's a problem with the Volvo relay though. Hollister also supplies two different temp switches as well, though they come in their kit. I doubt they would have a problem with giving those part numbers if someone were to email them.
I still have an updated video to make, but I currently have the radiator out of the truck and I'm sizing up and adapting the Mark VIII fan I got, I'm very optimistic about this one. It's definitely overkill for the 4.7, and probably overkill for me, but it adds a bit of future proofness (not a word) to my setup, one day I hope to have even more power.
#18
Join Date: Jan 2011
Location: Sandy, UT. (SLC Suburbs)
Posts: 2,063
Likes: 0
Received 5 Likes
on
5 Posts
OK, so I got the lower temp dual BMW switch today, and I can confirm it is indeed an 80/88 switch, low is on at 80 and high is on at 88. My guess is this design was meant to go after the radiator in the flow direction, on a BMW. Whereas the 91/99 is before the radiator. But for someone with a 180 Tstat, this might fit better than the 91/99. I will keep you posted on the switch.
I also got my replacement radiator, so the Mark VIII fan will be in tonight and should have it running tomorrow morn. more on that in my hemi build thread later.
I also got my replacement radiator, so the Mark VIII fan will be in tonight and should have it running tomorrow morn. more on that in my hemi build thread later.
#19
OK, so I got the lower temp dual BMW switch today, and I can confirm it is indeed an 80/88 switch, low is on at 80 and high is on at 88. My guess is this design was meant to go after the radiator in the flow direction, on a BMW. Whereas the 91/99 is before the radiator. But for someone with a 180 Tstat, this might fit better than the 91/99. I will keep you posted on the switch.
I also got my replacement radiator, so the Mark VIII fan will be in tonight and should have it running tomorrow morn. more on that in my hemi build thread later.
I also got my replacement radiator, so the Mark VIII fan will be in tonight and should have it running tomorrow morn. more on that in my hemi build thread later.
I see you're getting the Mark 8 fan, is it also 2 speed? The ones I'm familiar with are single speed and were pulse controlled from the ECU based on the coolant temp sensor input.
#20
Here's a link to a US company that makes/supplies thermal switches - both one output as well as multiple. I've never used any of their 2 switch units, but they should work the same as what you're using FrenicX & are available in NPT thread. They have a 1 sheet on-line catalog available or you can call them to decide on exactly what you need.