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Air condition pump clutch does not activate - 2000 Volkswagen Jetta TDI

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This will happen because of 1 of 2 situations in both euopean and ameriacan autos. The freon charge is too low or circuit breaker requires replacement. I'm betting that your freon is low. Take care to certifed auto mechanic to have freon boosted. Should take care of problem for less than $100.00

Posted on Jul 05, 2010


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2008 trail blazer 4.2 4x4 fan under the hood runs all the time. Why how to fix?

What fan ? Your vehicle doesn't electric cooling fans , has engine cooling fan and clutch driven by the crankshaft via the drive belt. Your probably taking about the
Secondary Air Injection System Description .
The secondary air injection (AIR) system aids in the reduction of hydrocarbon exhaust emissions during a cold start-up. This occurs when the start-up engine coolant temperature (ECT) is between 5-50?°C (41-122?°F), and the intake air temperature (IAT) is between 5-60?°C (41-140?°F). The AIR pump operates 5-60 seconds after start-up.
The engine control module (ECM) activates the AIR system by simultaneously supplying grounds to the AIR pump and the AIR valve relays. This action closes the relays' internal contacts. The AIR pump and the AIR control solenoid valve/pressure sensor assembly are in turn energized, the pump runs and the control/shut-off valve opens.
The AIR pump sends pressurized fresh air into the pipes/hoses through the open control/shut-off valve, and into the exhaust manifold. The extra air accelerates the catalyst operation, helping it to reach operating temperature faster. The AIR pump remains ON for a short period of time after the control/shut-off valve is commanded OFF. When the AIR pump is commanded OFF it will not run or be activated until the next vehicle start. When the AIR system is inactive, the closed AIR control/shut-off valve prevents air/exhaust flow in either direction.
In the under hood fuse box find AIR PUMP fuse # 64 60amp pull the fuse an see if the fan goes off . There are two relays secondary Air injection (AIR ) pump relay . The contacts may be stuck together .
In the under

Oct 05, 2016 | 2008 Chevrolet Trailblazer

1 Answer

Air condition problems

No it shouldn't unless activated by the fan switch. If the fan switch is activated, then probably not enough freon in the system.

May 17, 2013 | 1994 Mercury Grand Marquis

1 Answer


Step 1:

What does tP0411 Secondary Air Injection System Incorrect Flow DetectedWhat does that mean? Secondary Air Injection is an emission control that uses an air pump (either electric or turned by the drive belt) to move fresh air into the exhausticon1.png manifold(s) or exhaust ports when the engine is in open loop and pre-catalytic converter when in closed loop. This reduces hydrocarbon emissions (HC), Carbon Monoxide (CO), and oxides of Nitrogen (NOx). This fresh air helps convert Carbon Monoxide (CO) into Carbon Dioxide (CO2) and Hydrocarbons (HC) into water vapor (H20).
A check valve is located in the air supply line to keep exhaust gasses from flowing into the pump. A cutoff valve that controls the airflow may be vacuum controlled or electrically controlled. When the powertrain control module (PCM) activates the valve, vacuum travels to the cutoff valve to open it and allow fresh air to flow. Some systems may have only a check valve and the flow may be regulated by a electromagnetic clutch on the air pump (similar to an A/C clutch).
Under hard acceleration, the air pump will be deactivated to prevent backfiring in the exhaust. To self-check, the AIR system will be activated by the PCM and fresh air would be routed into the exhaust system. The oxygen sensors would sense this fresh air as a lean condition and the short term fuelicon1.png trims would begin to move in the positive direction to compensate. The PCM expects to see this happen within just a few seconds during the self test. If it does not see the short term fuel trims rise, then the PCM interprets this as a malfunction in the AIR system and a code will be recorded.

Step 2:

Symptoms Symptoms of a P0411 DTC may include:
  • MIL (Malfunction Indicator Lamp) illumination
  • Backfiring in the exhaust under hard acceleration
  • Engineicon1.png running rich (This is counter-intuitive. See explanation below)
  • Squealing belt
Causes Potential causes of a P0411 code include:
  • Damaged or missing check valve
  • AIR pump intake port plugged/damaged
  • AIR pump clutch malfunction
  • Holes or damage to exhaust components

Step 3:

Possible Solutions If you have access to a scan tool, with KOEO (Key on engine off) command the AIR pump on. It should activate. If it doesn't, remove and inspect the AIR pump relay for discoloration/melting due to heat. Repair as necessary.
With the ignition on (engine off) check for battery voltage at the switched battery feed to the relay and the relay control circuit. If either of these isn't present, inspect circuit for blown fuse or open/short in the wiring. Repair cause of short and retest. If they are both present, jumper the battery feed to AIR pump feed circuit using a fused jumper. The pump should activate. If not, check for powericon1.png and ground present at the AIR pump when jumpered. If there is no voltage/ground present at pump repair open in wiring harness. If voltage and ground is present, but pump still does not run, suspect a bad AIR pump. If after jumpering the AIR pump feed circuit the pump activates then the problem is likely the AIR pump relay. Replace and retest.
If the scan tool activates the AIR pump, with KOER (Key on engine running) activate the AIR pump solenoid valve on and see if there is vacuum to the cutoff valve. It should have vacuum present to open the valve. If there is no vacuum present, check the AIR pump's vacuum solenoid valve for vacuum supply from the manifold. If there is vacuum present then the vacuum solenoid is likely bad. Replace it. If there is no vacuum present at the supply to the vacuum solenoid, check for a plugged or damaged vacuum line or plugged vacuum port. But if there is vacuum present at the cut-off valve, shut the engine off and using a vacuum pump, apply vacuum to the cut-off valve and see if it holds a vacuum and that air flows through it when vacuum is applied. If it doesn't hold vacuum or the valve doesn't flow when vacuum is applied, replace the cut-off valve. If the cut-off valve works properly, inspect the check valve for obstruction or to see if it's missing. Replace as necessary.
Check the steel line to the exhaust catalyst as well as the exhaust ports for damage or holes that could give a false reading.

Feb 19, 2013 | 2007 Buick LaCrosse CXL Sedan

1 Answer

Little vibration when i start the A/C.

The air conditioner is designed to operate using a electromagnetic clutch assembly that receives a command signal from the activation switch. This command controls when electricity is supplied to the compressor clutch that engages and disengages the air conditioner system. If the air conditioner expansion valve/office tube is plugged or the system has excessive oil or refrigerant it can cause the system to vibrated when activated. To check for this condition the system will need to be drained and refilled to proper specifications.

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Apr 11, 2011 | 2007 Ford Expedition EL XLT

4 Answers

I turned on my air conditioning today for the first time since last fall... it was not blowing cold air. It was working fine the last time i used it 3 months ago. Could it be a fuse problem?.. or maybe...

While the engine is running as you turn on the A/C , the compressor will latch on now as you will find the engine faulting in RPM as it comes on. Now if this is so the compressor, the solenoid clutch is good and the fault can be only loss of gas in the system. If not the compressor pumping pressure needs a check. Also if gas has leaked the system needs a test for leaks.

Feb 25, 2011 | 1999 Mercury Sable

2 Answers

While running the air conditioning, the air cools and then warms and eventually cools for a little bit again. I think the water pump is what's needed here? what is the big bolt behind the fan?

It is unlikely that the water pump is causing the trouble you describe. The large hex behind the fan is what you would turn to remove the fan clutch from the water pump shaft. This fan clutch is supposed to detect heated air coming through the AC condenser and radiator and engage the fan more positively with the water pump shaft when more air needs to me moved to cool the radiator and AC condenser. The fan clutch could be bad or the AC system may not be properly charged--either of these conditions could cause the problem you describe.

Feb 25, 2010 | 2005 Dodge Ram 1500

2 Answers

Air condition pump does not work ,Clutch does not engage on pump.Is there a fuse for this


Jul 13, 2009 | 1981 Ford F 150

1 Answer

One pulley does not move all the time with the serpentine belt, but when it does you can hear a rattling sound and when the pulley stops so does the sound.

That should be your air conditioner pump. If you turn off the AC or the defroster it shouldn't turn on.

If it is very noisy it should be replaced. There should be a wire or plug on it that you can disconnect if you want it to quit running.

If you do disconnect it, your air conditioning will not work anymore.

There is a magnetic clutch that activates whether the pump is running or not

Apr 15, 2009 | 2004 Mazda 6

1 Answer

Air conditioning clutch froze,snapped serpentine belt

went and bought an ac unit at junk yard since dealer gave me wrong bracket.

Feb 08, 2009 | 1989 GMC Sierra

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