Belt and Tensioner Article. This is not a simple job for inexperienced mechanics.
It involves special tools to do correctly. I found that most all shops wanted to replace the whole compressor and all the associated parts for a considerable amount of money. There are 2 reasons they do this. First, they know that in most cases if the bearing and clutch are worn the rest of the compressor is probably near the end of it's life. If they replace the clutch and bearing and the rest of the system fails shortly thereafter no matter what they say they will have an angry customer.
Repairing the multitude of compressors requires a substantial investment in special tools and specific expertise that is only practical if you are a specialty parts rebuilder. Here's what one of my readers found. After taking the clutch off one of my friends told me to check the main bearing in the compressor by moving the shaft up and down. The bearing in my compressor was worn out. Even if I would have been successful in installing the clutch the compressor would have failed shortly thereafter.
If it's on 10 days a year that would be a lot. I felt that there probably wasn't much wear on the compressor so I decided to replace the bearing. If you bought your truck used you really won't know the history. This whole episode started last summer when the air coming out of my blower vents wouldn't change from the top to the bottom.
This was traced to a failed vacuum pump. It sounded exactly like turbo whine. We checked everything related to the turbo and couldn't find any leaks or problems. The turbo was working fine making enough pressure.
I was out in Colorado in September of 04 and I heard a new louder noise. A tech at the Hummer dealer in Denver said there were 2 problems. One was the power steering pump because whenever I turned the wheel the pitch of the louder sound changed.
Secondly, he said that the bearings in the turbo were getting worse and I should look into getting a new turbo. I took a chance and drove back to IL with no problems except the noise under the hood. As soon as I got back I took some time and really got into the problem.
I listened to the noise and determined it wasn't the power steering pump. Some of the accessories hanging on the front of the engine use bushings and others use roller bearings. Bushings and Bearings make different noises. A bad bushing will 'scream' or 'screech' while a bearing will make a 'whirring' or grinding sound. The noise was definitely a bearing sound. I listened to the noise with a mechanics stethoscope and determined that the noise was either coming from the air conditioning compressor pulley bearing or the belt tensioner.
I pulled the belt off and gave each a spin. This bearing is a sealed roller bearing. I was fortunate that I'd found the problem before it led to a major disaster. I knew if I continued to drive the truck with the bad bearing it would eventually sieze and cause the serpintine belt to break leaving me stranded and probably ruining the air conditioner compressor.
The second part of the saga was my quest for finding the part at the right price. Checking in my Hummer service and parts manual they showed how to replace the bearing and the pulley. The shop manual showed that you needed special tools to pull and reinstall the pulley and a special tool to install the bearing into the pulley. The top left shows the rear of the pulley.For people who live in hot climates, the air conditioning in the car is definitely a blessing.
While many people take car air conditioning for granted, its importance is clear when the air conditioning fails or the compressor is damaged. There are some common symptoms of a bad AC compressor switch and some simple repairs for them. The AC compressor is the most integral part of the air conditioning system and is responsible for pressurizing the refrigerant and distributing it. The reason for this is that the damaged compressor does not distribute the refrigerant effectively, which means that the air conditioning system no longer blows cold air.
The AC compressor is a complex component and has a number of internal components that perform certain functions.
If the compressor is damaged, the internal components are also affected and start to produce different types of noise. For example, worn bearings can produce a squeaking or grinding noise. The best option, in this case, is to replace the entire compressor. The vehicle AC compressor has a built-in bearing, and these bearings prevent the liquid from escaping while the refrigerant is pressurized.
However, when the AC compressor gets old, these bearings are damaged and as a result the fluid starts to leak through them. In such a case, you will see liquid leaking near the compressor, indicating that the bearings are worn out.
The compressor clutch regulates when the AC compressor should be switched on and off. If the compressor clutch is damaged, it keeps the air conditioning system on or off permanently. A defective compressor clutch can be replaced, but it is generally recommended to replace the entire compressor to save time and additional costs.
To be on the safe side, you should take some diagnostic steps before you finally conclude that the compressor needs to be replaced. If not, there is some sort of problem with the air conditioning. Next, open the hood and visually inspect the AC compressor for signs of damage, rust, leaks, etc. Any visible damage is an indication of a defective or malfunctioning AC compressor. Also, the compressor will not work properly if there is not enough oil, and may even cause the temperature in the vehicle to rise.
If you have inspected the compressor and cannot find any damage or rust, the next step would be to check the belts to make sure they are in good condition and have no cracks. A worn belt can cause damage to the compressor, so it is advisable to replace it as soon as possible.
The clutch is located in front of the AC compressor. Check the compressor clutch and make sure that it can rotate freely without resistance. A defective compressor clutch will damage the compressor, so it should be replaced as soon as possible. You can try to switch on the AC compressor manually. To check if the AC compressor starts, start the engine and set the AC fan setting to max.
Open the hood and see if you can hear the sound of the compressor. If the compressor does not start, you will hear a funny nose. The refrigerant in the AC system should not be low, nor should it leak. If there is a leak, the AC performance of your vehicle will not meet requirements, and the best way to detect a leak is to use an electronic leak detector.
Check if there is refrigerant pressure in the AC system using an air conditioner that does this job for you, or you can check it manually by using a pressure gauge. You should have about 14 bar on the high-pressure side and 2.
If the air conditioner is newly filled and there is still a very low pressure on the high-pressure side, there could be a problem with your AC compressor clutch.
To test if the AC compressor switch is working properly, you can turn it on manually with some simple tools. You can do this at home. An easy way to check the clutch of your AC compressor is to gently and lightly tap on the clutch when the compressor is running and the motor is on. Sometimes, when the clutch is worn, the disc is too thin and may not engage properly. This must be done very carefully so that you do not get your tool stuck in the snake belt and ruin your engine, which could result in serious damage.
This is only recommended if you have a great deal of knowledge about it.Forums New posts Search forums.
AC Compressor Clutch Adjustment / Replacement parts advice. [2002 Envoy SLT ]
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It must have gotten very hot as I had to clean up a lot of the black epoxy that I assume from the coil. I check the coil and it was about 3.
If so how? Can I just get a new Pulley, Clutch and coil for it. I didn't see any specific parts on ebay or elsewhere on the web but they reman the compressor so the parts have to be available some where. I could not see any visible numbers on the unit but I believe it is a Sanden Compressor Thanks! There's ways to change the shim and adjust the clutch spacing. We discussed it more on the old site. Run this Google search: "ac clutch shim site:trailvoy.
Thanks for the suggestion. I did as you suggested and found discussions about changing the shims and even leaving them out. I have one shim in there, I guess it's a hit or miss kind of thing. I didn't see any clearance or way to measure it due to the lip on the hub. I examined the clutch closely when I had it a part and nothing looked damaged with the exception of the surface wear on both the hub and the clutch.
The strength of the magnet is a what holds the clutch engaged so I guess it needs to have a pretty close clearance to get a good engagement I needed to get it back on the road so I put it back together hoping I wouldn't have anything further to do in the way of adjustments oh well! Now I have to find a place who sells shims Sparky Moderator.Forums New posts Search forums.
Chevy Trailblazer AC Compressor OEM Clutch BEARING 2005 2006 2007 A/C
I did a bunch of reading and bought a set of hf guages. It worked ok on a cool morning but quit when it got hot. With the guages the pressure is nearly equal. The compressor wouldn't turn on. I tried jumpering the relay to get it to come on without any luck. When I put the relay back in it does the same.Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing. Learn More. Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.
However, the AC clutch cycling switch is actually the most common part to fail on many vehicles. The switch has a simple job, but it must engage and disengage every time the compressor cycles. This creates significant wear and tear, and leads to eventual failure. Really, the name says it all when it comes to what this switch does.
AC Compressor Clutch Symptoms & Replacement Cost
The AC cycling switch opens when the low side AC system pressure drops too low to allow pressure from the high side to equalize the system and keep refrigerant flowing through the entire air conditioner.
The most common problem with the switch is with the contacts — wear and burning render them inoperable. If this happens, the entire switch must be replaced. If the AC clutch cycling switch is not operational, then the system will not be able to equalize pressure and keep refrigerant flowing. This may activate the safety switch generally, the low pressure switchand the system will shut down in order to try to prevent damage.
Over time, this will cause the clutch to fail. Get an upfront price. Service Location. YourMechanic Benefits Online Booking. Mechanic comes to you. Free 50 point safety inspection. See availability. Keep in mind: The AC clutch cycling switch is one of the most wear-prone components on your air conditioner. How it's done: The AC clutch cycling switch is verified to see if it needs to be replaced The defective AC clutch cycling switch is removed The new AC clutch cycling switch is installed The AC clutch cycling switch is tested for operation The AC is tested to ensure proper operation of the AC clutch cycling switch.
Our recommendation: If the AC clutch cycling switch is not operational, then the system will not be able to equalize pressure and keep refrigerant flowing. AC system not cooling as normal AC system not cooling at all Clutch will not engage a sign of systemic damage, possibly caused initially by a failing clutch cycling switch. How important is this service?
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No reviews yet Write a Review. Current Stock:. Quantity: Decrease Quantity: Increase Quantity:. Share This Article. Product Description Item description. Please read feedback. All parts I am offering are made by OEM certified supplier. Unlike many other sellers I can't afford to sell cheap copies The only component on your compressor, that never stops moving, is your clutch pulley and most failures are the clutch NOT the compressor.
By repairing the clutch, you are saving on refrigerant, labor, compressor and parts like filter drier and expansion valve. This Item fits. Item is shipped within 1 business day of receipt of payment, 24 hours to the address provided by PayPal. You must email us with the reason for return and all item information: Item transaction Number, Your PayPal email address, Date you paid for the item, etc.
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