Why does clutch not engage with AC switch?

Put compressor /clutch assembly back in car and clutch would not engage with the ac switch. Checked OHMs on the coil and it was close to .4 OHMs. Bad Coils. Applied 12 volts straight to the clutch coil and still nothing happened other than wires getting hot because of a short.

What are the ohms on a car clutch?

I did re-checked the ohms on the clutch on the car, it was disconnected, just like on your bench test. Used a multi-meter and got .4 Ohms (2-5 is good). Originally, on the bench it had 5 Ohms. Also applied voltage to the two leads at the connector to see if it would engage.

What happens when there is no clutch on a compressor?

If there’s no clutch operation, the A/C fuse/clutch relay and control device must be ruled out. Many scanners are capable of performing a function test by activating the A/C clutch relay. The A/C relay is often the cause of no clutch operation. A clutch coil and it’s circuit can be tested for resistance with a DVOM using the Ohm and Volt selection.

What should the resistance of a clutch coil be?

If the battery voltage is present at the plug, test the coil for resistance. Resistance Test: Perform an A/C clutch coil resistance test with an Ohmmeter. Typically a clutch coil should be between the range of 2 to 5 Ohms, and any reading below 2 Ohms or over 5 Ohms indicates a bad coil.

What’s the resistance between the coil and the clutch?

Rechecked resistance after putting voltage to coil and it measures .5 ohms. Bad coil. First compressor and clutch I tested, clutch engaged perfectly with voltage supplied. I put this compressor completely back into the vehicle and turned the ac switch to air.

What happens when a clutch is worn out?

The main reason behind a clutch that is worn out is friction. For the clutch to work, it must be equipped with friction materials. These friction materials begin to thin after continuous usage. When these friction materials are depleted, the pressure plate can no longer perfectly grab. This leads to slipping.

Why does my car clutch not engage when low on refrigerant?

That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. DIY recharging kits tell you to recharge through the low pressure port while the compressor is engaged. But if the system is low on refrigerant, the clutch will never engage.

What happens when an electric clutch turns off?

With the what happens when the clutch eventually turns off. Did you lose voltage indication? if necessary. Battery voltage for this test should be 12 to 14 volts. when the clutch disengauged?

Why does my GM clutch have low voltage?

The problem with GM systems is they use a diode in the circuit to control system load to the circuit. This diode can fail allowing voltage to leak to ground without blowing a fuse or damaging the relay. I would check the voltage at the relay to the coil.

What happens when the clutch doesn’t work on an air conditioner?

The clutch disc is splined to the compressor shaft. As the clutch disc pulls in towards the pulley, the pulley provides the rotating power to operate the compressor. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. So start your diagnosis by determining if the compressor clutch works.

How to check the voltage of a clutch?

Check the operation of the clutch and AC system quickly by running a temporary jumper wire from the battery to the clucth. You can determine which prong is positive and which negative by using a volt/ohm meter on the harness plug and checking on which one goes to ground.

How many volts does a clutch and coil need?

I bench tested the coil with a OHM meter and was around 5 Ohms. 2-5 is a good coil. Hooked up 12 volts to the clutch and coil and the clutch pulled in just fine. Put compressor /clutch assembly back in car and clutch would not engage with the ac switch.

When did I replace clutch and compressor on my PT Cruiser?

This topic contains 19 replies, has 3 voices, and was last updated by Mark Stephen Lammers 5 years, 10 months ago. I replaced the compressor and clutch with a used assembly on my 2001 PT Cruiser.

Why does the coil short out in a clutch?

The diode in the diagram may be there to limit the amount of current flowing through the clutch, so without that, the clutch pulls an unrestricted amount of current and the coil wire melts, shorting it out. [quote=”cap269″ post=140417]The clutch coil is an electromagnet. It doesn’t matter which way polarity is hooked up.

What to do if your a / C clutch is not working?

When the A/C system does not blow cold air the first thing that you show check is if the compressor engages. If it doesn’t do not assume that the A/C compressor itself is the problem. Remember that the A/C clutch is controlled by the A/C Control Unit. If that unit detects an error it will not engage the A/C compressor to avoid it getting damaged.

How often should you change the clutch on a car?

A car which is driven properly and in normal traffic conditions will usually not need any attention to the clutch for at least 100,000 Km.

How to manually engage AC compressor clutch, the easiest?

There is no need to switch on the air conditioning system for this method to work. Tips – You should route the jumper wire to avoid it getting tangled or interfering with other moving components. It is an ominous sign when the clutch engages but the compressor does not spin. Changing the compressor clutch could be the only solution in this case.

What’s the proper voltage for an AC clutch?

You just need to take a pair of alligator clips or something metal and jump those terminals together to get the compressor to run. Please check with a mechanic before following my advice though. get a service manual!!! I’m pretty sure that all automotive AC clutches use normal system voltage (12.7V minimum). yup, thinking that too.

Why is my Clutch only getting 2.7 volts?

If you are only getting 2.7 volts at the connector then there is a problem from the A/C relay to the clutch coil connector circuit. The problem with GM systems is they use a diode in the circuit to control system load to the circuit.

What to do when Clutch won’t engage?

So you need to use a paper clip to bypass the relay switch and force the clutch to engage. You can then recharge the freon and re install the relay switch and it will sense more pressure and the clutch will engage by itself. Loading…

How to manually engage AC compressor clutch, an easy guide?

Since our main goal here is to engage the clutch manually, we must know what causes an AC compressor clutch to be faulty. Here are three reasons why: By far, this is the most common. You must use a multimeter to check for this. To check this, unplug the connector at the clutch coil and turn on your AC. Then, examine its battery voltage.

Why is the clutch not engaged on my gas compressor?

But if the system is low on refrigerant, the clutch will never engage. Some DIYers then hotwire the low pressure switch to force the compressor clutch to engage while they recharge. BAD MOVE. At that point you’re running the compressor with little to no oil.

What causes an AC compressor to not engage?

If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. AC compressor clutches receive power in a number of ways. They can activate through a relay that’s energized directly by a proper condition of the low and high pressure switches.

Why does my AC compressor clutch not engage?

Why AC clutch won’t engage If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. AC compressor clutches receive power in a number of ways.

What should you do if your AC clutch is not engaging?

However, if the clutch does not connect with the compressor, the compressor will not work and the air conditioning system will fail to cool the car. Try checking if the clutch is in good condition by applying these steps: Turn the AC controls to maximum air conditioning.

How is the clutch connected to the AC unit?

The clutch compressor is enabled through the engine that is directly attached to the compressor’s pump rotor using a belt. However, most car AC systems now use an electromagnetic clutch piece that engages the compressor to spin the air conditioning unit.

Why does the clutch on my car not engage?

There are three reasons why the compressor clutch does not engage, especially if the sensor detects them. These include low or excess refrigerant and insufficient oil. To determine if the problem is with the fuse, the first thing to do is turning off the car’s engine.

Why does clutch not engage with AC switch?