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buzzminix
New User
Aug 28, 2010, 9:58 PM
Post #1 of 5
(2706 views)
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Just bought a rebuilt 08 F150 4X4 4.6L with 13k miles. The a/c condenser is new and the system recharged. At highway speed the a/c works well. At extended idle it blows hot air and the coolant bottle sometimes boils over. There are a couple of blades on the fan that are partially broken off at the tips from the accident and I am planning on getting a new fan blade can I get just a new blade? also on the fan clutch there is a connector that has nothing connected to it but I don't see anything dangling anywhere. will this not being hooked up cause the fan not to speed up at low speed? also where does it connect to?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 29, 2010, 4:58 AM
Post #2 of 5
(2698 views)
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Re: a/c hot at idle
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I certainly wouldn't be driving that thing with a damaged fan or fan clutch.
The cooling fan clutch is an electrically actuated viscous clutch that consists of 3 main elements:
- a working chamber
- a reservoir chamber
- a cooling fan clutch actuator valve and a fan speed sensor (FSS)
The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the PCM. By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.
The PCM optimizes fan speed based on engine coolant temperature (ECT),
engine oil temperature (EOT), transmission fluid temperature (TFT),
intake air temperature (IAT), or air conditioning requirements. When an
increased demand for fan speed is requested for vehicle cooling, the PCM
monitors the fan speed through the Hall-effect sensor. If a fan speed
increase is required, the PCM outputs the PWM signal to the fluid port,
providing the required fan speed increase.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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buzzminix
New User
Aug 29, 2010, 7:40 PM
Post #3 of 5
(2688 views)
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Re: a/c hot at idle
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okay, so now that I know that I shouldn't be driving it, can I replace just the fan blade? and where do I find the wiring harness that should connect to the fan clutch? It looks like there is 2 different plugs on it. Also would it be easier to just replace the mechanical fan with an aftermarket twin electric fan setup?
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Sidom
Veteran
/ Moderator
Aug 29, 2010, 9:06 PM
Post #4 of 5
(2686 views)
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Re: a/c hot at idle
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As you can see by the description, this is PCM controlled.... Seems like your SES light should be on but not all failures turn a light on but they do set codes.....
I would be worried about where the other end of the harness is, if it's PCM controlled there has to be ref voltage going to it and I sure wouldn't want that unconnected ref line grounding somewhere.......
Best thing to do is fix it the correct way but if you have a damaged fan blade you definitely need to get that fixed (I guess anyway you can) before it comes apart and hurts someone or does damage to the truck.....
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Roaster
New User
Sep 23, 2010, 11:43 PM
Post #5 of 5
(2625 views)
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Re: a/c hot at idle
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as well as my concern if it happened to me i ll change the whole system and got rid of it .... Its time consuming and very much painful that one thing works and won't...
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(This post was edited by Hammer Time on Sep 24, 2010, 2:29 AM)
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