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cooling fan works on a temp sensor in the engine block. it only turns on when the temp reaches a set limit and shuts off when it gets below a set limit.. cooling fan components are , fans, fan relay , and temp sensor . best way to test the fans would be to let the car set running and watch the temp till it goes up to 185 -195 deg. at this time the fans should turn on and the thermostat should open and cool the engine back down. also when ever the air conditioning is on so should the cooling fans be on. if the fans do not run the check all components till you find the broken one. fan relay and air conditioning relay are separate but work the same. and will interchange
I have the same type of ford focus. The engine cooling fan is located next to the radiator. There are two engine cooling fans and they are controlled by an engine temperature switch located on the engine under your alternator by the firewall. The a/c cooling fan is located on the firewall under the hood. It blows air through your a/c core (this core is called an evaporator, it looks like a minature radiator.) and as the freon goes through the evaporator, the air from the a/c blower pushes cold air in to your car through your vents.
you might want to see if the cooling fan is working at the radiator.if its not then the fan motor may be no good.by putting the blower motor on you are giving the system air flow to pull heat out of the cooling system by it blowing air over the heater core.you can remove the plug on the fan motor and connect jumper wires directly from power and ground to the connectors on the fan motor,if the fan doesn`t work then the cooling fan motor will have to be replaced.you also could have a thermostat that is not opening all the way causing a rise in engine temperature.
climate control units in most cars use the ac system to regulate temp in the cab. the ac system requires a fan to pull air over the condensor on the front of the car. its normal for a fan to come on. unless you have a bad engine temp sending unit thats causing the engine cooling fan to come on improperly.
try turning off the heat and ac and see if it still comes on.
Both of them works when the ac is on? If so the fan motor is good. This means that maybe the temperature switch is bad. It is normal for the temperature to go 3/4 of the way up, then the fan should kick in. If it doesn't kick in then the temperature switch is bad.
1. Does the cooling fan turn on when it over heats? 2. Check your coolant level, if it is a little low it will cool normally under transit and over heat in the conditions you are describing. Also have your coolant check for proper dilution. 3. If your cooling fan is failing to turn on you may have a coolant temperature switch issue.
On my 2001 Focus Zetec 2.0L, the radiator fan only worked with the air conditioning turned on (as in no low speed - engine would overheat while idling or in traffic, but was fine as long as the A/C was on). The fix was to replace the radiator fan resistor assembly located in the fan shroud between the fans.