Why does my radiator fan only turn on with AC?
The most likely culprits are a thermostatic switch, fan resistor, temperature switch, low-speed or high-speed relay, or a wiring issue. When the vehicle has the AC on, the engine needs extra help cooling so the ECU commands the fan to be on any time the AC is on.
What causes cooling fans to come on?
Defective temperature switch, coolant sensor or other sensor. Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay. A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
What if the radiator fan turns on only when the AC is on but overheats when is off?
If overheating is encountered when the AC is Off, may mean that the temperature sensor that send control signal for the radiator fan motor may possibly be faulty.. or the control logic that dictate which switch will control the radiator fan motor when engine temperature reach a preset level, with or without the AC …
How do you diagnose a bad cooling fan?
Symptoms of a Bad or Failing Cooling/Radiator Fan Motor
- Cooling fans do not come on. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on.
- Vehicle overheating. Another symptom of a possible problem with the cooling or radiator fan motors is the vehicle overheating.
- Blown fuse.
Does a car thermostat control the fan?
The thermostat in the cooling system controls many of the electric fans. When the temperature in the engine reaches a certain preset temperature, the fan will begin cooling the engine. When the temperature dips below that preset temperature, the fan will turn off.
What happens when the AC is on in a Subaru?
Check to make sure your cooling fans on the radiator are running when the AC is on. Check to make sure your cooling fans on the radiator are running when the AC is on. Click to expand… yea, both fans are running fine. Engine temp stays normal. Start with the obvious: Once the AC reaches the desired temperature, it’ll stop cooling.
Why does my Subaru heater blow cold in the winter?
If that does it the heater hot water valve or temperature control could be the problem.. A quick , cheap fix is to clamp it off in the summer and remove the clamp in the winter.. If it’s the Evaporator icing up, after a long ride with the Air on and not producing cold.
Why does my AC blow cold and then warm?
Anytime I give it a cold start, the ac works like a champ for the first 5 minutes, then it just goes warm for the rest of the time. If I turn it off to go into a store or something, it’ll still blow warm, only gets cold again if it’s off for a while.
When to turn on the AC for cold air?
On a hot day with the car baking in the sun, when you turn on the engine and subsequently the AC, you should get cold air for a good 30 min before the desired cabin temp is reached. Note: if you leave the temp setting too high, you make be toggling the heat to come on.