Fan Clutch engaging at highway speed
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Junior User
Joined: Jun 2004
Posts: 65
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From: Tampa Bay, Florida
Fan Clutch engaging at highway speed
Hello All,
1994 Ford E-350 ex-uhaul box truck. I just got back from a 420 mile trip across the state of Florida. I was loaded up going and empty coming back. Today' s temp was around 85 degrees and breezy. The previous owner installed a new aluminum radiator water pump, fan clutch, hoses coolant etc. My fan clutch would kick in at 55- 65 mph, only with the air conditioner on. The temp would stay at N and would not go above O. The truck did not get hot at all, and there was plenty of air coming thru the radiator and condensor. When loaded, It would engage for about 2.5 minutes every 4-5 minutes. Unloaded it would engage for 1.5 minutes every 7-8 minutes. I did notice that the fan shroud looks like an aftermarket one and there is about a half inch of space between the shroud and the radiator. I never had a vehicle do this at highway speeds. It bogs me down a little when the fan clutch kicks in and I feel the need to slow down. Its friggin noisy too. Do I have a defective fan clutch?
Joe Flash man
1994 Ford E-350 ex-uhaul box truck. I just got back from a 420 mile trip across the state of Florida. I was loaded up going and empty coming back. Today' s temp was around 85 degrees and breezy. The previous owner installed a new aluminum radiator water pump, fan clutch, hoses coolant etc. My fan clutch would kick in at 55- 65 mph, only with the air conditioner on. The temp would stay at N and would not go above O. The truck did not get hot at all, and there was plenty of air coming thru the radiator and condensor. When loaded, It would engage for about 2.5 minutes every 4-5 minutes. Unloaded it would engage for 1.5 minutes every 7-8 minutes. I did notice that the fan shroud looks like an aftermarket one and there is about a half inch of space between the shroud and the radiator. I never had a vehicle do this at highway speeds. It bogs me down a little when the fan clutch kicks in and I feel the need to slow down. Its friggin noisy too. Do I have a defective fan clutch?
Joe Flash man
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
The previous owner installed a new aluminum radiator
Diesel engine coolant temperature at the top of the radiator where hose attaches after high rpm or under load condition for 20 minutes should be (195-237*F) 91-114*C nice time to have a temperature reading point and shoot tool.
Did the PO replace the thermostat too, overheating could mean the wrong one installed....... need a Ford or IH Tstat only.
CAUTION:
The specified/required thermostat does not contain an internal bypass, since the bypass is located in the cylinder block. Whenever the thermostat is replaced, it is mandatory that only Motorcraft E5TZ-8575-C or Navistar 1807974C94 thermostat be installed.
Thread Starter
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Junior User
Joined: Jun 2004
Posts: 65
Likes: 0
From: Tampa Bay, Florida
Hi,
Dont know about the radiator. Maybe its not cooling enough. I purchased it from a woman that purchased it from a u-haul place in Tampa. I will also check out the thermostat. I am wondering why the temp sensor on the fan clutch is engaging when there is plenty of air flow coming thru the radiator at highway speed. I degreased the condensor trans cooler, Everything is clean and new. If its not an air flow problem then it has to be a circulation problem. Maybe my temp gauge is wrong. Thanks for the response.
Joe Flash man
Dont know about the radiator. Maybe its not cooling enough. I purchased it from a woman that purchased it from a u-haul place in Tampa. I will also check out the thermostat. I am wondering why the temp sensor on the fan clutch is engaging when there is plenty of air flow coming thru the radiator at highway speed. I degreased the condensor trans cooler, Everything is clean and new. If its not an air flow problem then it has to be a circulation problem. Maybe my temp gauge is wrong. Thanks for the response.
Joe Flash man
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