Question about 2001 Dodge Dakota

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Will a seized air compressor cause the vehicle to not start???

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  • Contributor
  • 31 Answers

No it will start, but may squeel if the compressor is seized.

Hope this helps

Posted on Aug 07, 2010

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Posted on Jan 02, 2017

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davespcr
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SOURCE: A/c Does Not Work

Most likely the cause is low freon charge. Contrary to popular belief, an A/C system never 'loses' freon normally - this always means a leak but sometimes the leak can be so small that it is virtually undetectable.
Your A/C system has a 'low pressure' switch, usually mounted on the compressor, that shuts the compressor down to prevent damage when the freon's psi falls too low. To test your compessor: with the engine running you'll need to connect a wire to the positive battery terminal and one side of the switch and just touch another wire from the negative battery terminal to the other side.
If the compressor is OK, the clutch 'plate' will engage & spin when both wires are connected. Either way, you should have this done at a licensed garage as you probably don't have the proper tool to test & repair the system if you do find the problem.
If you decide to do this yourself, please be very, very careful not to get shocked (use thick wires with good insulation) and don't wear long sleeves or loose clothing as you will be working right near the spinning pulleys and belt(s). Good Luck!

Posted on Dec 13, 2008

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The belt starts and then quickly stops


Are you referring to the serpentine belt under the hood? What year, make and model of vehicle? Are you sure the battery is charged and the starter motor is working properly?

Start with the simple things, such as checking the battery voltage and using a large breaker bar with a socket to fit the crankshaft pulley to see if the engine will spin by hand.

On several Dodge and Chrysler products it's somewhat common for the A/C compressor field coil to seize with the compressor clutch and for the compressor itself to seize up causing what you describe.

If you remove the belt, then try to start the engine and it spins over freely, the issue is likely that something is seized.

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What causes your AC unit to blow hot air, bad relay or bad Compressor? I had a leak, an had that repaired.


bad fuse ,relay compressor seized ,component over heated,,dirty filter,dirty evaporator ,condenser fan motor,thermostat,low freon [possible wasn't repaired correctly] anything can cause an a/c to blow hot air

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What would cause my belt to not spib & squeal realy loud on my 93 Ford mercury topez


If the belt is not turning, there will be a seized pulley. Possible alternator.. power steering.... water pump... tensioner.... idler pulley ... AC compressor seized. The belt will need to be removed and all the pulleys spun by hand to isolate tone that may be seized

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Dorman Products makes a special bracket & idler pulley assembly for most popular American vehicles like yours. It is installed so that you can remove a seized A/C compressor. Check with your local auto parts stores to see if Dorman has this for your vehicle. It's called an Air Conditioning Compressor Delete Kit. See

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2005 chrysler town & country compressor seized engine will not turn or start


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1 Answer

Ttrying to fine out where to put the air for the airshock


Vehicles: Cadillacs with ALC-controlled rear shock absorbers

Each rear shock absorber has an ALC (air) port. One may disconnect the ALC air line and try to add air, but this is unlikely to work, since there is no spring-loaded valve to close the port off immediately (like a tire).

A better method for inflating the rear shocks to see if they hold air is to supply 12V DC (from the battery) directly to the ALC system (air) compressor.

Debugging your Cadillac's ALC system can be a challenge. Here are a few basics.

Here's a depiction of the ALC port on the rear shock - found at the end of the ALC air tube.


12_2_2011_12_54_42_am.jpg

Fig. 1 The ALC connection on the rear shock absorber

Here's a close-up of the Cadillac ALC port on the rear shock


12_2_2011_12_59_49_am.jpg

Fig.2 Cadillac ALC air line fitting

---------------------------------------------------------------------------------------------
Automatic Level Control System - General Description
Vehicles Without Road Sensing Suspension

The Automatic Level Control (ALC) system automatically adjusts the rear height of the vehicle in response to changes in vehicle loading.

The ALC system consists of a height sensor, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and two rear shock absorbers . The air compressor assembly consists of an air compressor and an air dryer mounted on a bracket. The air compressor head is a replaceable part of the air compressor. The (air) exhaust solenoid is a non-replaceable part of the air compressor head.

The compressor is activated when the ignition is on, and weight is added to the vehicle. The exhaust solenoid is connected directly to the battery (+), enabling the system to exhaust with the ignition on or off when excess weight is removed.

Vehicles With Road Sensing Suspension
The Automatic Level Control (ALC) system automatically adjusts the rear height of the vehicle in response to changes in vehicle loading.

The ALC system consists of the CVRSS control module, two CVRSS position sensors, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and two rear shock absorbers. The air compressor assembly consists of an air compressor and an air dryer mounted on a bracket. The air compressor head is a replaceable part of the air compressor. The exhaust solenoid is a non-replaceable part of the air compressor head.

The vehicles rear vertical height is measured by the two CVRSS position sensors. These two position sensors convert this rear height measurement into an analog voltage (0 to 5 volts DC) which is read by the CVRSS control module. The control module then determines what action (exhaust, compress, or no action) shall take place. To compress, the CVRSS control module switches the low-side of the ELC compressor relay to ground.

The air compressor is enabled (switched to battery only when the ignition is on. The air compressor is activated when a sufficient amount of weight has been added to the vehicle.

The exhaust solenoid is enabled at all times. The exhaust solenoid is activated when weight is removed from the vehicle.

Automatic Level Control System Operation w/o F45

Raising the Vehicle
When a load is added to the vehicle, the vehicle body moves down causing the sensor actuating arm to rotate upward. The upward arm movement activates an internal timing circuit and, after an initial fixed delay of 17 to 27 seconds, the sensor provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 in), the sensor opens the compressor relay circuit, and the compressor is turned off.

Air Compressor Head Relief Sequence
In order to reduce current draw during air compressor starting, the height sensor performs an air compressor head relief sequence before air compressor operation. This sequence reduces the air pressure in the air compressor cylinder during start-up. The air compressor head relief sequence occurs as follows:

Exhaust solenoid is energized.
Air compressor is activated 1.3 seconds after the exhaust solenoid is energized.
Exhaust solenoid is de-energized 0.5 seconds after the air compressor is activated.
Lowering the Vehicle
When a load is removed from the rear of the vehicle, the body rises, causing the sensor actuating arm to rotate downward. This again activates the internal timing circuit. After the initial fixed delay, the sensor provides a ground to complete the exhaust solenoid circuit, energizing the solenoid. Now, air starts exhausting out of the shock absorbers, back through the air dryer and exhaust solenoid valve, and into the atmosphere.

As the vehicle body lowers, the actuating arm rotates to its original position. When the vehicle body reaches its original height, +/- 25 mm (+/- 1 in), the sensor opens the exhaust solenoid circuit, which closes the exhaust solenoid and prevents air from escaping.

Air Replenishment Cycle
The sensor actuating arm position is checked when the ignition is turned on. If the sensor indicates that no height adjustment is needed, an internal timer circuit is activated. After about 35 to 55 seconds, the compressor is turned on for 3 to 5 seconds. This ensures that the shock absorbers are filled with the proper residual pressure. If weight is added to or removed from the vehicle during the time delay, the air replenishment cycle is overridden, and the vehicle rises or lowers after the normal delay.

Automatic Level Control System Operation w/ F45

Raising the Vehicle
When a load is added to the vehicle, the vehicle body moves down causing the sensor actuating arm to rotate upward. The upward arm movement activates an internal timing circuit and, after an initial fixed delay, the CVRSS control module provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 in), the compressor relay circuit is opened and the compressor is turned off.

Air Compressor Head Relief Sequence
In order to reduce current draw during air compressor starting, the CVRSS control module performs an air compressor head relief sequence before air compressor operation. This sequence reduces the air pressure in the air compressor cylinder during start-up. The air compressor head relief sequence occurs as follows:

Exhaust solenoid is energized.
Air compressor is activated 1.3 seconds after the exhaust solenoid is energized.
Exhaust solenoid is de-energized 0.5 seconds after the air compressor is activated.

Lowering the Vehicle
When a load is removed from the rear of the vehicle, the body rises, causing the sensor actuating arm to rotate downward. This again activates the internal timing circuit. After the initial fixed delay, the CVRSS control module provides a ground to complete the exhaust solenoid circuit, energizing the solenoid. Now, air starts exhausting out of the shock absorbers, back through the air dryer and exhaust solenoid valve, and into the atmosphere.

As the vehicle body lowers, the actuating arm rotates to its original position. When the vehicle body reaches its original height, +/- 25 mm (+/- 1 in), the exhaust solenoid circuit is opened, which closes the exhaust solenoid and prevents air from escaping.

Air Replenishment Cycle
An air replenishment cycle (ARC) is commanded after each ignition-ON cycle. The purpose of the ARC is to ensure that the ALC system is operating at or above minimum air pressure (residual air pressure). The ARC occurs as follows:

The EXHAUST SOLENOID IS ENERGIZED 20 seconds after the ignition has been turned on.
The AIR COMPRESSOR IS ACTIVATED 1.3 seconds after the exhaust solenoid is energized.
The EXHAUST SOLENOID IS DE-ENERGIZED 0.5 seconds after the air compressor is activated.
The AIR COMPRESSOR IS DEACTIVATED 3.2 seconds after the exhaust solenoid is de-energized.

Dec 01, 2011 | 1998 Cadillac DeVille

1 Answer

Hi were is located the air level pump relay? because the air pump does not work when U try to rise the vehicle.


your air compressor is most likely seized, this is due to air bags in suspension system leaking air.and compressor was constantly running. take to dealer to verify.

Jan 24, 2011 | 2007 Bentley Continental GTC Convertible

3 Answers

Air conditioner


The squeeling is the belt because the air compresor is likely seizing. At idle it can't turn the compressor, in motionthe compressor probably turns and cools the air. Most air conditioners come on when the defroster is on.

Jul 26, 2010 | 1996 Nissan Quest

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