Why does my radiator fan run full speed when I start the car?

Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. The AC is OFF. The radiator and condenser are BRAND NEW. This problem existed before and after the radiator was replaced. The fan continues to run at its maxiumum speed, regardless of the engine temperature.

What does it mean when Fan is running at constant high speed?

If it is higher, the air-conditioning control module presumes that the pressure is high and assigns the fan control module to run at 90% PWM actuation. Also check the AAC pressure at stand still / cold. This should be approximately 5 – 6 bar. Confirm that there are no wiring issues to the sensor. Pin 2 – Signal. Reference values:

Why does my car battery die when I Turn Off the fan?

The design is to have the fan switch fail into an on position to protect the engine. Many a battery have been killed due to this because they normally run in for a few minutes after you stop. So you don’t know if it’s the normal few minutes run or a permanent one when you park and walk away.

What should I do if my engine cooling fan is running at high speed?

Replace the sensor and confirm good location of the wiring connector. Locate wiring in order to avoid chafing of harnesses. Use the AssistPlus to check the reading in the climate control module. As the system is still currently empty, this should read 0 bar. Fill the system with the specified amount of refrigerant and oil.

Why does my car fan keep running after I Turn Off the engine?

Running cooling fans help cool down the engine even after you turn off the car. Common Causes. If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. Here are some possibilities causing the fan to stay running longer. low coolant level, faulty coolant temperature sensor,

How long does it take for the radiator fan to turn on?

Turn the air conditioning to the maximum setting – this should spark the cooling fan to immediately come on. This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars.

Is the engine cooling fan running all time?

Several days ago,one of my old customers drove his Chevrolet Cruze to my garage and ask to solve the trouble of engine cooling fan running all time.It took technicians to fix the problem,and I will share the progress here.Hope it will be a useful info!

What happens when the radiator fan burns out?

If the cooling fan motor burns out, the cooling fans will then, in turn, be disabled. Since the cooling fan motors work in tandem with the fan blades to pull air through the radiator, the blades will then not be able to spin or cause any airflow to cool off the car.

Why is the air coming out of my air conditioner so slow?

Air flow that is too slow for any reason (such as a dirty filter or dirty blower fan assembly blades) can cause first, air temperatures that are abnormally low coming out of the air conditioner, and eventually a reduction in air flow as coil ices over.

Why is my Motherboard fan spinning so fast?

The motherboard deliberately does this, then detects the temperature of the motherboard and the CPU. If everything is “cool” (pun intended), and the motherboard is functioning correctly, it tells the fan to slow down. > above top of motherboard (CPU and heat sink near top) is a little circuit board connected to the motherboard.

Why does my C300 4Matic run full speed?

I am a new owner of a 2010 C300 4Matic that I bought from an insurance auction – the car was a salvage car due to a front impact. I have repaired all of the damage, but there is one issue that I cannot figure out. Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. The AC is OFF.

Why is my furnace blower running at low speed?

Also if you have a high efficiency furnace, there is more of a chance to have the secondary heat exchanger plug up rather than the A/C coil. You can also have a blower motor issue. The motor can be faulty or seizing up causing it to not spin fast enough to move enough air through the furnace.

Why is my blower motor not spinning fast?

If its a fixed speed motor and your getting power to it but its not spinning fast enough it could possibly be a bad blower motor. If you decide to change out the blower motor, make sure to get the appropriate replacement capacitor to go with it.

Is the radiator fan running at full speed?

Today when driving my car I realized that my radiator fan was running at full speed on and off the entire ride. The fan is also at full speed upon start up of the vehicle. Please be advised that my AC IS NOT ON, and that I’m only driving in 50-60 degree weather.

Is there a way to slow down a heat pump fan?

The boss lady over the lab found a website that said if you slow down the fan speed on the blower and turn the fan on continuously it will be more comfortable and use less power. She said it would also help with dust problems, which they have. I opened it up and it has a four speed fan motor, 3/4 HP.

When does the cooling fan come on in a car?

In my case, the cooling fan comes on when the engine is cold, even with the HVAC off and it will remain running at full speed when the engine is running, again with the HVAC off.

How often should a radiator fan be turned on?

Go on you tube an check out videos on testing cooling fan’s , testing relay’s .Before you replace a sensor you don’t need too . The fan should turn on at no more than the width of the needle past normal. It should be running just about all the time after normal operating temperature is reached.

How does a high speed fan control relay work?

When the engine temperature reaches 200 degree’s the PCM energizes 1 to 3 Cooling fan relay’s in the battery junction box (fuse-relays ) The low speed fan relay , High speed fan control relay 1 , an high speed fan control relay 2 . Now what problem are you having ?

Why is my air conditioner fan running at high speed?

This problem is often caused by a faulty pressure sensor located on the air-conditioning condenser. If accessing fault codes, there are no relevant DTCs stored in the engine control module (ECM) or signal acquisition module (SAM). • Run a Quick Test to check for any relevant fault codes.

When does the radiator fan start and die?

Starts and dies after a few seconds to a minute. And yes. Yes. Since the radiator fan comes on when you start the car I’ve changed the ETCS. Checked the gas. … read more Vocational, Technical or Tra… 2008 SATURN VUE XR. ABS LIGHT CAME ON WHILE DRIVING. FIRST 2008 SATURN VUE XR. ABS LIGHT CAME ON WHILE DRIVING.

When do I Turn Off the fan on my car?

It runs normally but after I drive it for a while aand turn the ignition off long enough to fill up with gas, for example, it will not even attemt … read more 99 sc2 battery light on (recent new battery) turned car off and fan/motor kept on.

What happens when air conditioner fan is running at high speed?

What are the signs of a bad cooling fan?

Common signs include the engine running hot and cooling fans either not functioning or running all the time. 1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.

What to do if your AC fan won’t start?

Turn off the A/C unit and call in an HVAC technician to replace the capacitor as soon as possible. This is a quick and simple repair for a professional. If you leave the unit running, the fan motor will keep attempting and failing to start.

What should I do if my fan is running at a constant high speed?

Confirm that there are no leaks at the sensor, that the air-conditioning is operating as expected and that the fan no longer runs at a constant high speed. Finally use the AssistPlus to run a Quick Test and ensure there are no new fault codes.

Why are my cooling fans running at all times?

3. Cooling fans stay on at all times. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.

Why does my AC fan not come on?

When the ac is of the radiator hoses both become same heat after a while and the overflow reservoir starts boiling over and the fan do not kick in. Any advise please. You might have an initial temperature sensor which causes the fan to come on when the temperature begins to rise; that sensor might be defective.

What should I do when my radiator fan comes on?

It is for the fan module. When the ignition is on and you pull it the fans should kick in and turn slow speed. You can also put direct power by pulling the fan plugs and putting on power and ground to them. Fast speed and slow speed, fan should start turning.

Why does my Jetta not have a cooling fan?

Simply the engine is not hot enough to turn on the cooling fan, its not hot enough outside, you are driving getting plenty of air flow through the grille to keep things cool without the assistance of the fan. Its possible that you have no problem at all. Was this answer helpful? I got a 2002 Jetta the cooling fans don’t turn on .

Why does my radiator fan run full speed when I start the car?