JohnZ71
Z71 Tahoe Enjoyer
Okay so I finally bit the bullet and bought the Duramax fan blade part# 1580690 with severe duty clutch part# Hayden 2851.
@L31MaxExpress suggested this pairing for the most cooling possible, and so far it has not disappointed, though I’m hoping to tweak it just a little more.
The fan fits in the shroud BARELY on my OBS Z71 Tahoe. I drove it around to make sure it isn’t hitting at all, and while it never came in contact with the shroud…it is still a little too close for my comfort. I will trim the shroud ever so slightly to ensure enough room for any flex.
First impression: This MF COOLS the engine. I’ve never had my 5.7 stabilize at 187 degrees on a 100 degree day. That alone impressed me the most and worth the upgrade.
What I don’t like too much, the clutch is not engaged as much and takes a while to engage. I’m wondering if I can adjust the spring to make it lock in a little sooner.
Holding 1500rpms with the AC on high, fan DISENGAGED, the AC compressor will cycle off from the high pressure. It will do this for a few minutes until the fan clutch locks in, and when it does…WOW. AC turns cold, and the fan is incredibly loud. My issue is that the Clutch will disengage after about 30-45 seconds and repeat the above process with the compressor cycling until it locks in again. Engine temps are in the 180s during this so it really is cooling, no doubt.
At idle, AC is cooler and the engine does not get over 190. On a 100 degree day like today, engine temps would creep up to around 205-210 and the AC compressor would cycle off. The compressor stays locked in at idle now with vent temps at 58 degrees.
The pressure is too high for the AC regardless, I don’t know why anymore. I can only assume it’s because the serpentine style condenser? Can anyone verify if my 2000 Z71 Tahoe would’ve come with a parallel flow condenser or serpentine?
Either way, I love this fan!
@L31MaxExpress suggested this pairing for the most cooling possible, and so far it has not disappointed, though I’m hoping to tweak it just a little more.
The fan fits in the shroud BARELY on my OBS Z71 Tahoe. I drove it around to make sure it isn’t hitting at all, and while it never came in contact with the shroud…it is still a little too close for my comfort. I will trim the shroud ever so slightly to ensure enough room for any flex.
First impression: This MF COOLS the engine. I’ve never had my 5.7 stabilize at 187 degrees on a 100 degree day. That alone impressed me the most and worth the upgrade.
What I don’t like too much, the clutch is not engaged as much and takes a while to engage. I’m wondering if I can adjust the spring to make it lock in a little sooner.
Holding 1500rpms with the AC on high, fan DISENGAGED, the AC compressor will cycle off from the high pressure. It will do this for a few minutes until the fan clutch locks in, and when it does…WOW. AC turns cold, and the fan is incredibly loud. My issue is that the Clutch will disengage after about 30-45 seconds and repeat the above process with the compressor cycling until it locks in again. Engine temps are in the 180s during this so it really is cooling, no doubt.
At idle, AC is cooler and the engine does not get over 190. On a 100 degree day like today, engine temps would creep up to around 205-210 and the AC compressor would cycle off. The compressor stays locked in at idle now with vent temps at 58 degrees.
The pressure is too high for the AC regardless, I don’t know why anymore. I can only assume it’s because the serpentine style condenser? Can anyone verify if my 2000 Z71 Tahoe would’ve come with a parallel flow condenser or serpentine?
Either way, I love this fan!