220+ that is hot....I think a 180 with water wetter is a perfect choice...once i got to severe duty on the clutch fan...it should keep my rig under 200 consistently...which is AWESOME

 

I just finished up changing to 180 high flow stat, and added the water wetter. Idling with AC still got up to 207. When AC is off, electric fan blades are not spinning by air flow from main fan. It does spin them at cold start, because the fan clutch is engaged and "roars". No roar at very warm idle. About now I am wishing I had kept the "with Ac" version of the Chevy fan clutch. Just not enough air flow now. I am also tempted to do the Saudi grille conversion, but want to get one from a donor vehicle so I can swap back if I screw it up.

 

werent you running 220+ temps at idle with ac on...? if your running at 207..thats pretty darn good reduction just at IDLE alone

Yeah you should have kept the severe duty clutch fan

I want to do the saudi grill..but cant find the grill material at lowe's

 

Yes, with AC on, but also at around 11:00 this morning, latest numbers are after dark this evening, it has cooled off a lot. Will test again tomorrow in late afternoon. Looked on Hayden / Imperial's site, the non AC one is what they call standard duty (couples at 60-70%), the AC is heavy duty couples at 80 -90% of shaft speed. So that is like a 33% improvement, I guess. But I don't think mine is engaging at the warmer temp, never hear it roar.

 

there is a BIIIIIIIIG difference in air velocity between 60-70% to 80-90%...much much more CFM running through

 

I dug out my receipt (afflicted with severe case of packratitis), it has a one year exchange warranty, it is going back. Advance Auto.

 

I did that on my volvo, worked great.

However, my Disco has too many electrical issues for me to trust cooling to an electric fan.

Case in point, had I done the conversion there is no way I could have gone 200 miles on a battery without overheating - which is exactly what I did last weekend.

 

Well, lots of the side mounted front wheel drive mini vans have all electric fans. I guess the system should not run the fan except when temp is high enough, so when you are driving down the road at 30 - 60 mph no fan is needed. But DLB is right - you don't want to greatly diminish your battery reserve operating time

 

Especially since most minivans aren't going to be miles deep into the forrest/desert/etc. I'd prefer to be able to get back to the pavement @ 15-20mph without draining the battery to keep from overheating.

 

Just completed my "upgrade" of fan cluch from Chevy $49 model.

1. Chevy model is an Imperial/Hayden, Advance Auto Parts # 215157. For a 2000 Chevy Express 1500, w/o AC, 4.3 liter.

2. That unit is rated "no AC", they have an AC rated clutch that is #215107, but it is slightly larger and needs standoffs to mount to the fan. I had used one a few months ago, then went to the basic 215157.

3. Not happy with cooling at idle.

4. Found that Advance has a severe duty clutch, #215158, which is the 6 inch size of the #215157. It is for a 2000 Chevy S10, 4.3 liter. Bolts up good, plenty of clearance to radiator.

5. Pix show 215158 clutch on right, original Disco clutch on left. Pump pliers and a snap of the wrist is all it takes to remove fan clutch from pulley.

6. Test results:

Crank truck cold. Fan roar, condenser fans spin by air movement, 86F under hoof, AC off

3 minutes - roar is gone, coolant temp is 165 on scanner, condenser fans not spinning.

10 minutes - 20 minutes - test drive at 55 mph, AC on, coolant 178 - 183

at 21 minutes allow to idle with AC on, 185 coolant temp

at 44 minutes coolant temp is 210. Turned off AC. Condenser fans stop. No fan roar.

Turned off truck, let sit 5 minutes, cranked up, no roar (coolant temp had jumped up a little).


So I had a lot more air flow when it was cold (the Mark I palm reader method), and when I think it is hot the fan does not roar. It may be the roar comes on slowly, like a variable speed drill. Not sure how hot this clutch needs to be to bring on the roar. Will do test again in the 90's. Don't know why Adance Auto does not show the severe duty clutch for the Chevy Express 4.3. But the Imperial web site lists it for :

09-96 GMC-Chevy, Isuzu, Olds Trucks 4.3L V6, 4.8L, 5.0L, 5.3L, 5.7L,

6.0L, 8.1L V8

My store found it under S-10 pickup. It fits great. I just don't know how hot it has to get to roar, but specs say it would draw same HP at normal temps as the other clutches. About $8 more. Might be that if it is roaring, you are way too dang hot....