Cooling Fan
Member
Joined: Sep 2015
Posts: 1,128
From: Digging in your fridge
If a/c clutch relay is stuck on and a/c clutch coil has lower resistance than fan motor, the electrical current will go to the a/c clutch coil leaving no power to motor to spin.
All items in the circuit will continue to receive power until the total amp load exceeds the capacity of the fuse protecting it, at that point the fuse will blow and everything in the circuit quits.
Low resistance = high amp draw= blown fuse.
Member
Joined: Aug 2008
Posts: 1,606
From: Orange, CA, USA
One item with exceptionally low resistance isn't going to "suck power away from" another item sharing the fused circuit.
All items in the circuit will continue to receive power until the total amp load exceeds the capacity of the fuse protecting it, at that point the fuse will blow and everything in the circuit quits.
Low resistance = high amp draw= blown fuse.
All items in the circuit will continue to receive power until the total amp load exceeds the capacity of the fuse protecting it, at that point the fuse will blow and everything in the circuit quits.
Low resistance = high amp draw= blown fuse.
...Or fan may have higher than usual resistance
New Member
Joined: Jul 2017
Posts: 2
From: North Carolina
Need help with my issue if anybody can help please
My 07 Honda Fit sport just started heating up when I have ac on and it’s idling I can drive it with ac on for however long I want as long as it’s moving but once I stop after a while it starts heating up the hot light comes on the fan for ac condenser works fine always on as soon as I turn on ac but the driver side cooling fan doesn’t come on at all thought both were supposed to run together it only comes on to cool engine but doesn’t turn on with ac on also car doesn’t over heat when ac is off only when it’s on any input would help checked fuses in dash and hood all seem to be in working order and swapped relays both in good working order
Member
Joined: Feb 2008
Posts: 4,329
From: Cleveland, GA
My 07 Honda Fit sport just started heating up when I have ac on and it’s idling I can drive it with ac on for however long I want as long as it’s moving but once I stop after a while it starts heating up the hot light comes on the fan for ac condenser works fine always on as soon as I turn on ac but the driver side cooling fan doesn’t come on at all thought both were supposed to run together it only comes on to cool engine but doesn’t turn on with ac on also car doesn’t over heat when ac is off only when it’s on any input would help checked fuses in dash and hood all seem to be in working order and swapped relays both in good working order
If the main fan is not coming on under any circumstance, it's possible that the fan motor has simply died. I would try providing a direct 12v source to the motor and see if it turns on. If not, you need a new motor. They are expensive from Honda so you may want to find one used.
Member
Joined: Apr 2018
Posts: 100
From: Chicago
There's a temperature sensor in the radiator that completes the circuit to provide electricity to the radiator fan if the radiator temperature exceeds a certain predetermined value. Could be that sensor is not reporting the correct temp.
Member
Joined: Sep 2015
Posts: 1,128
From: Digging in your fridge
the driver side cooling fan doesn’t come on at all thought both were supposed to run together it only comes on to cool engine but doesn’t turn on with ac on also car doesn’t over heat when ac is off only when it’s on any input would help checked fuses in dash and hood all seem to be in working order and swapped relays both in good working order
One fan runs like it's supposed to but the other never runs? You proved the motor can run so I'd expect the dead side would have a fan fuse, relay, or wiring issue. I'd grab up a wiring diagram and voltmeter or $3 test light and dive in to start figuring out the problem.
Check fan motor connector terminal to chassis ground (also do a loaded test)
Check fan motor connector to relay (hot side, live power check)
Do not drive it with the HOT light on. It can and will lead to head gasket failure (that's how I picked ours up cheap LOL)
Make sure radiator is completely full
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