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Old 05-27-2009, 02:02 PM
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Cooling problem.

I have a 1993 F/S GMC truck with a 5.7 engine well I know my fan clutch is bad because when im in stop in go traffic the temp starts going up but once on the road it cools down fast. OK my stat is brand new and I decided to go with a flex fan so I bought one and the 2" spacer and it's the correct fan for my truck and the temp goes up fast. I was wondering can you guys figure whats going on? Also just hours before it was placed on it was cooling good just driving around but when I took it for a test drive after placing the flex fan at night when it was cooler the temp went up fast or faster than it has ever has since I bought the truck new back in 1993 im also running a 160' stat because of my chip. My temp went up over 210' today just on a short drive.
Thanks! RJ

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Old 05-27-2009, 04:38 PM
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Originally Posted by GMCTRUCKS
I have a 1993 F/S GMC truck with a 5.7 engine well I know my fan clutch is bad because when im in stop in go traffic the temp starts going up but once on the road it cools down fast. OK my stat is brand new and I decided to go with a flex fan so I bought one and the 2" spacer and it's the correct fan for my truck and the temp goes up fast. I was wondering can you guys figure whats going on? Also just hours before it was placed on it was cooling good just driving around but when I took it for a test drive after placing the flex fan at night when it was cooler the temp went up fast or faster than it has ever has since I bought the truck new back in 1993 im also running a 160' stat because of my chip. My temp went up over 210' today just on a short drive.
Thanks! RJ
Check the pitch direction of the blades, if a standard rotation (clockwise) fan, it's blowing air out the grill if it's turning on a OEM serpentine driven water pump.

Bogie
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Old 05-27-2009, 06:03 PM
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Bogie my son is working on it right now and he noticed that the pitch is different so im going to look for the right one or exchange it for the right one but mean time he's putting back the old one it cools good it's just in stop in go traffic or when left idling on a hot day the temp goes up.
Thanks! RJ
PS-It's more like a mission now I want a flex-fan on my truck that's going to work correct that way I won't ever have to mess with a clutch again in this TEXAS heat.
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Old 05-27-2009, 06:29 PM
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Originally Posted by GMCTRUCKS
Bogie my son is working on it right now and he noticed that the pitch is different so im going to look for the right one or exchange it for the right one but mean time he's putting back the old one it cools good it's just in stop in go traffic or when left idling on a hot day the temp goes up.
Thanks! RJ
PS-It's more like a mission now I want a flex-fan on my truck that's going to work correct that way I won't ever have to mess with a clutch again in this TEXAS heat.
I hear ya' about Texas heat, I used to live in League City, 'bout half way between Houston and Galveston. When my wife complains about how hot Seattle is on an 80 degree day, I remind her that's the temp we used to keep the house at during the summer. OK, from Easter to Thanksgiving.

Typically a cooling problem at extended idle is an airflow issue thru the radiator, not always but it's a like 90 percenter.

Bogie
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Old 05-28-2009, 02:29 PM
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imho clutch fan is the best way to go, they dont wear out except after so much mileage. flex fans commonly dont keep engines cool. i know of so many of these turcks with wlel over 200lk on them and have the clutch fans on them still and are perfectly fine


so im thinking you have a different issue cause here. rad may need flushed,

water pump maybe getting weak, or a hose collapsing


etc


good luck!
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Old 06-14-2009, 11:11 PM
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Yes it was the wrong pitch thanks for the info im just going back with new clutch.
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