Did you have the vehicle scanned for DTC'S - diagnostic trouble codes ? That would be the first thing to do. Cooling fan an the alternator are both controlled by the PCM - engine computer .
Testimonial: "Hi Jeff Yes no codes whatsoever i think its a wireing issue rather than a component"
Not just engine code's , full vehicle scan . BCM - or GEM etc... Do you know how to test automotive electrical circuit's , viewing wiring diagrams for the affected systems an then using a DVOM - digital volt ohmmeter to test ? Free wiring diagrams herehttp://www.bbbind.com/free-tsb/ Enter vehicle info. Year , make , model an engine . Under system click on engine , then under subsystem click on either cooling fan or charging system . Click the search button then the blue links . Video's on youtube how to check cooling fan an charging system .
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SOURCE: high speed fan running all the time
if temperature is over 80 degres outside, or the ac pressure over 250, it will be on all the time, but if still doing it, like abnormal, then have the a/c presuure swtch replace or inspect.
SOURCE: ac knob on kia has a short?
blower motor is going bad replace and have your ac system checked by trained tech
SOURCE: 2000 Lincoln LS overheatjng with ac on. My coolin
HI, there are three devices that control fan operation and speed as well. i recommend inspecting these three components for there operational value. test thoroughly and check the wires as well. if you detect any faults within these three devices, replace immediately. I will list the parts to inspect and there respective definitions as well.
Problem spots to inspect--
1.Inspect the Cooling fan switch-- The cooling fan switch on electric fans monitors coolant temperature signals from the engine control computer. When the engine is cool, the switch opens to keep the fan from spinning. When engine is warm, the switch closes to turn fan on for cooling.
2. Inspect the Cooling Fan Control-- This module Reads the temperature of the coolant and passes the information to the engine control computer (ECC). The ECC receives analog information and signals the cooling fan switch to cycle the cooling fan on or off, as required.(controls actual speed as well)
3. Inspect the Temperature switch-- A bi-metal, heat activated, switching device that controls an electrical circuit based on engine metal/coolant temperature. It controls the cooling fan(s), temperature light or gauge, fuel mixture, emissions controls and electronic-control unit functions. It's usually made of brass or stainless steel and uses a tapered pipe thread (NPT) for dependable sealing. replace if faulty.
You will find the problem in one or all of the above discussed areas.
Please rate and god bless:)
SOURCE: The radiator cooling fan is not working. Upon
assuming fuse and relay are good..no fan should be running when the engine is cool/cold, the only time the fan should be running when it reach over operation temperature which then the fan kick on to bring the temperature back down to it operation temperature. both fan work in sync with one another, addition cooling is needed when the ac is running. when the last time have you replace thermostat and Thermos sensor/switch. I would replace both unit if you have not done so. The thermos/switch will turn the fan on when it reach certain temperature and cut off when it sense the temperature drop in the engine.
Testimonial: "Very good advice. I replaced the cooling fan myself and saved a lot of money. Everything is seems to be working. Thanks."
SOURCE: Blower fan not working for heat and AC
This sounds like a BSC blower speed controller. it is located outside on the a/c case just below the heater hoses. to diagnose just wiggle the connector with the key on engine off, you should hear the fan come on, then replace it.
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