Fan clutch
06-21-2021, 11:53 PM
#1
Fan clutch
I was having problems with my ac not cooling the cab of my truck and was told the fan clutch is bad. Well I replaced it today (it's the electric one) . After starting the truck up the fan was on a low speed and it never changed throughout the temps. Coolant temp turned up to 230° F (letting it idle and revving the engine to try and make the temp go up) and the fan stayed the same. It also never changed when I turned the ac on. Is it suppose to be a one constant speed or does it have a high setting as well? It's a 2007 f150 5.4l
*Update: Fresh start of the day the fan does seem to be in a high setting for about 30 seconds. Shouldn't it hit that same speed when it gets up to temp?
*Update: when I disconnect the wiring harness to the fan clutch, the fan continues spinning at same speed. Help please.
*Update: I bought a Murray fan clutch and on my way home the temp gauge hit all the way to hot but only showed 230° on scanner. I turned on the heater and pulled over. I turned the engine off and left the key in the on position with the heater running. While looking under the hood I heard a boiling noise coming from the heater core area, a few seconds later it dumped a bunch of coolant almost as if it burped. It was fine after that, probably dumped about a cup worth of coolant and that was it. I went home and installed the new Murray fan clutch the next day. Everything seems to be better so far and it does sound like the fan speed increases but still don't think it's as fast as it should. No longer overheating and the ac stays cooler then before.
*Update: Fresh start of the day the fan does seem to be in a high setting for about 30 seconds. Shouldn't it hit that same speed when it gets up to temp?
*Update: when I disconnect the wiring harness to the fan clutch, the fan continues spinning at same speed. Help please.
*Update: I bought a Murray fan clutch and on my way home the temp gauge hit all the way to hot but only showed 230° on scanner. I turned on the heater and pulled over. I turned the engine off and left the key in the on position with the heater running. While looking under the hood I heard a boiling noise coming from the heater core area, a few seconds later it dumped a bunch of coolant almost as if it burped. It was fine after that, probably dumped about a cup worth of coolant and that was it. I went home and installed the new Murray fan clutch the next day. Everything seems to be better so far and it does sound like the fan speed increases but still don't think it's as fast as it should. No longer overheating and the ac stays cooler then before.
Last edited by Andrew95621; 06-26-2021 at 08:48 PM.
06-22-2021, 05:41 AM
#2
Mark
iTrader: (1)
Andrew, read what you posted back to yourself and see if it makes sense to you.
06-22-2021, 10:16 AM
#3
06-22-2021, 11:34 AM
#4
Might just be me, but do electric fans have a clutch?
The clutch is for the mechanical fans mounted to the water pump and allows them to freewheel at temp.
I just re read the post again. You mean its a mechanical fan but the clutch is electric right?
The clutch is for the mechanical fans mounted to the water pump and allows them to freewheel at temp.
I just re read the post again. You mean its a mechanical fan but the clutch is electric right?
Last edited by Roadblock007; 06-22-2021 at 11:41 AM.
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Andrew95621 (06-22-2021)
06-22-2021, 11:46 AM
#5
I was having problems with my ac not cooling the cab of my truck and was told the fan clutch is bad. Well I replaced it today (it's the electric one) . After starting the truck up the fan was on a low speed and it never changed throughout the temps. Coolant temp turned up to 230° F and the fan stayed the same. It also never changed when I turned the ac on. Is it suppose to be a one constant speed or does it have a high setting as well? It's a 2007 f150 5.4l
Was your truck also overheating before changing the clutch ?
in other words, it’s not clear (to me at least) if you had two initial problems (overheating ect and poor a/c). OR, if you only had one (poor a/c), but the changing of the clutch resulted in ect overheat)?
regardless though, suggest running the heater (and NOT a/c) if/when your engine is running hot.
06-22-2021, 11:49 AM
#6
Yes the clutch is electric. I was confused about it at first when purchasing it as well, figured since it has a wiring harness that it is electric. I wanted the $70 one but I had to pay an extra $200 because it has wires 😂. I'll put this as an update but fresh start of the day the fan does seem to be in a high setting for about 30 seconds. Shouldn't it hit that same speed when it gets up to temp?
06-22-2021, 11:51 AM
#7
has left the building
Does the new fan have the same connections as the previous?
Did you not reconnect everything.
Unplug the electrical connection(s) and take note if the same number of pins exist. Not sure how you could have been issued a one-speed fan but need to start somewhere.
I do not know if the fan pins control speed or if the BCM does. I believe it is in the fan though. If the fan pins are identical, one would think the signal isn't being received to turn on the 2nd speed. If you there are two connections, one of the connection may not be securely connected or is not connected at all.
If that doesn't pan out -reinstall the old fan making sure IT is functional. Do you know 100% the previous fan was operating on the highest speed?
In newer years (before they went to full electric fans), the clutch system is electrically controlled.
I didn't get to see the original post, however techrep is one of the skilled folks here to help people solve problems. It would be wrong if a day went by that people didn't compose a proper sentence. There isn't anything wrong with asking a person that is requesting help to compose a message that is easy to follow. TechRep was obviously not fully aware of what you were asking, otherwise he would have already solved your problem.
People generally join a forum because they are stumped of frustrated. After the 2 minutes it takes to register, they spend no time composing a question. We know nothing about the person, the truck or the problem and we're expected to decipher the person and a confusing question all at the same time. Of course when we ask them to help us out they become offended. We can't win.
Did you not reconnect everything.
Unplug the electrical connection(s) and take note if the same number of pins exist. Not sure how you could have been issued a one-speed fan but need to start somewhere.
I do not know if the fan pins control speed or if the BCM does. I believe it is in the fan though. If the fan pins are identical, one would think the signal isn't being received to turn on the 2nd speed. If you there are two connections, one of the connection may not be securely connected or is not connected at all.
If that doesn't pan out -reinstall the old fan making sure IT is functional. Do you know 100% the previous fan was operating on the highest speed?
In newer years (before they went to full electric fans), the clutch system is electrically controlled.
I didn't get to see the original post, however techrep is one of the skilled folks here to help people solve problems. It would be wrong if a day went by that people didn't compose a proper sentence. There isn't anything wrong with asking a person that is requesting help to compose a message that is easy to follow. TechRep was obviously not fully aware of what you were asking, otherwise he would have already solved your problem.
People generally join a forum because they are stumped of frustrated. After the 2 minutes it takes to register, they spend no time composing a question. We know nothing about the person, the truck or the problem and we're expected to decipher the person and a confusing question all at the same time. Of course when we ask them to help us out they become offended. We can't win.
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06-22-2021, 11:53 AM
#8
So initial concern was poor a/c temp?
Was your truck also overheating before changing the clutch ?
in other words, it’s not clear (to me at least) if you had two initial problems (overheating ect and poor a/c). OR, if you only had one (poor a/c), but the changing of the clutch resulted in ect overheat)?
regardless though, suggest running the heater (and NOT a/c) if/when your engine is running hot.
Was your truck also overheating before changing the clutch ?
in other words, it’s not clear (to me at least) if you had two initial problems (overheating ect and poor a/c). OR, if you only had one (poor a/c), but the changing of the clutch resulted in ect overheat)?
regardless though, suggest running the heater (and NOT a/c) if/when your engine is running hot.
06-22-2021, 11:58 AM
#9
Does the new fan have the same connections as the previous?
Did you not reconnect everything.
Unplug the electrical connection(s) and take note if the same number of pins exist. Not sure how you could have been issued a one-speed fan but need to start somewhere.
I do not know if the fan pins control speed or if the BCM does. I believe it is in the fan though. If the fan pins are identical, one would think the signal isn't being received to turn on the 2nd speed. If you there are two connections, one of the connection may not be securely connected or is not connected at all.
If that doesn't pan out -reinstall the old fan making sure IT is functional. Do you know 100% the previous fan was operating on the highest speed?
In newer years (before they went to full electric fans), the clutch system is electrically controlled.
I didn't get to see the original post, however techrep is one of the skilled folks here to help people solve problems. It would be wrong if a day went by that people didn't compose a proper sentence. There isn't anything wrong with asking a person that is requesting help to compose a message that is easy to follow. TechRep was obviously not fully aware of what you were asking, otherwise he would have already solved your problem.
People generally join a forum because they are stumped of frustrated. After the 2 minutes it takes to register, they spend no time composing a question. We know nothing about the person, the truck or the problem and we're expected to decipher the person and a confusing question all at the same time. Of course when we ask them to help us out they become offended. We can't win.
Did you not reconnect everything.
Unplug the electrical connection(s) and take note if the same number of pins exist. Not sure how you could have been issued a one-speed fan but need to start somewhere.
I do not know if the fan pins control speed or if the BCM does. I believe it is in the fan though. If the fan pins are identical, one would think the signal isn't being received to turn on the 2nd speed. If you there are two connections, one of the connection may not be securely connected or is not connected at all.
If that doesn't pan out -reinstall the old fan making sure IT is functional. Do you know 100% the previous fan was operating on the highest speed?
In newer years (before they went to full electric fans), the clutch system is electrically controlled.
I didn't get to see the original post, however techrep is one of the skilled folks here to help people solve problems. It would be wrong if a day went by that people didn't compose a proper sentence. There isn't anything wrong with asking a person that is requesting help to compose a message that is easy to follow. TechRep was obviously not fully aware of what you were asking, otherwise he would have already solved your problem.
People generally join a forum because they are stumped of frustrated. After the 2 minutes it takes to register, they spend no time composing a question. We know nothing about the person, the truck or the problem and we're expected to decipher the person and a confusing question all at the same time. Of course when we ask them to help us out they become offended. We can't win.
06-22-2021, 12:03 PM
#10
No didn't have an overheating problem. I just updated the original statement saying it was at an idle for a long time while also trying to rev it to get up to temp. Tried to see the fan kick into a higher speed but it just stayed the same. Also with fresh start of the day the fan did go into a high setting for about 30 seconds.
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needsmoarturbo (06-22-2021)