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post #1 of (permalink) Old 12-12-2002, 01:27 PM
mcrackin
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Flex Fan question

What is you guys take on installing a flex fan. I want to get a little more cooling at low RPM's when at idle. I have a 88 with a 351w. The only time it gets a little warm is when I have the AC on at an idle. While it is moving there is no problem. Then the AC doesn't cool as much. as soon as I start moving all is OK it start cooling again no problem.
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post #2 of (permalink) Old 12-12-2002, 02:08 PM
Shilo
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Re: Flex Fan question

I don't think a flex fan will cure your problems. I don't think they are supposed to cool BETTER at lower rpms, they are supposed to flatten out at higher speeds when you don't need as much cooling in theory, thus making for less engine drag and more power (in theory).

I think you have other problems, but if you think you need more fan get a solid spacer to replace your fan clutch, or get a 7 blade fan from a Chevy.
post #3 of (permalink) Old 12-12-2002, 04:31 PM
 
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Re: Flex Fan question

You said the C word [img]images/graemlins/shocked.gif[/img]
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post #4 of (permalink) Old 12-12-2002, 07:04 PM
 
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Re: Flex Fan question

has anyone ever seen that theory work? I was kinda wondering about that now for awhile, but with so much on my plate I haven't gotten around to asking.
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post #5 of (permalink) Old 12-12-2002, 07:40 PM
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Re: Flex Fan question

just make sure you dont get ahold of one of those exploding Chebby fans that they've been recalling recently because of decapitations [img]images/graemlins/blush.gif[/img] [img]images/graemlins/smirk.gif[/img]
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post #6 of (permalink) Old 12-13-2002, 07:38 AM
mcrackin
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Re: Flex Fan question

What do you guys think then. With the AC off the truck will run cold. Just barely move on the gage. As soon as the AC come on and I am stationary the temp will start to go up to the n or no in normal. The AC wont work as good but as soon as I start to move the temp goes back down and the AC kick's. While I am moving I keep the ac down at low because it works that well. As soon as I stop I have to increase the speed to keep the air flow moving. Obciously increasing the speed doesn't make it cooler just move the air a little more. Give me idea's?
post #7 of (permalink) Old 12-13-2002, 09:40 AM
 
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Re: Flex Fan question

Put in a bigger Radiator.
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post #8 of (permalink) Old 12-13-2002, 09:53 AM
Shilo
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Re: Flex Fan question

I think it could very well be a fan clutch issue. Is your clutch tight? Does it provide noticeable resistance when warm? How old is it? I might suggest installing a quality HD fan clutch.
post #9 of (permalink) Old 12-13-2002, 09:59 AM
 
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Re: Flex Fan question

Well, I would say the theory is more fact. However, don't think changing to a flex fan is going to do wonders, or actually be noticeable in the power/mileage department.

Flex fans are also very suseptible to water damage in deep water crossings.....REP-T!!!! If they go, you can probably kiss the radiator goodbye as well, maybe other items.


As to the problem here, how is your idle, is it at normal range? could it be bumped up a bit?

Have you put new AC refrigerant in lately? This will increase the efficiency of your AC, making this low idle, poor AC cooling better.

Is your radiator clear of obstructions in the front, so the fan can do its job at idle? Has your radiator been flushed/filled lately?

You do have the stock fan shroud on, correct? You have not played around with changing thermostats?
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post #10 of (permalink) Old 12-13-2002, 10:07 AM
mcrackin
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Re: Flex Fan question

The shroud is still on there. I have not done anything else as far as messing around with the cooling system. I dont know of resistance of the fan clutch. I will have to check that. I keep the radiator clean dut did not flush it out. I read about getting ride of the clutch and put in a hard spacer. What do you think?
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