On some GM applications the high side service port is located past the condenser and before the orifice tube on the liquid line. This makes diagnosing by gauges deceiving. Usually, the high side port is found before the condenser. With the port in front of the condenser, it gives you a more accurate understanding of what the pressure truly is going into the condenser. With the high side after the condenser, you could show a pressure reading that is false, because the condenser could be partially blocked. Therefore, the only reading you are getting is what is exiting the condenser.
The correct way to diagnosis this type of system, with the service ports so close together, is through temperature testing:
Check the temperature at the inlet and outlet of the condenser. *An acceptable temperature differential is 30°-50°F .
Car giving you the summer time blues? From AC vs. rolling the windows down to keeping your pet safe, here are answers to your summer driving questions.
Like most people, chances are good that when summer time rolls around, you’re ready to get in the car and go. From a day trip to the beach to a weekend getaway, summer is all about traveling and having fun. With the snow gone and heavy spring rains in the past, you probably think nothing of getting in the car and taking off. But what you might not know is that the heat can be just as tough on your car as driving in winter. From keeping an eye on the coolant fluid to cooling off a parked car, here are some tips for safe and comfortable summer time driving.
The GM HT6 is one of the most popular compressors replaced today. Mac’s offers two Sanden options for the two most popular HT6 compressors.
The first is the 6511339 HT6 O.E. style compressor for the GM 5.7 V8, Mac’s offers the 6511340 Sanden style replacement compressor.
Next for the GM 4.3L V6 applications with the 6511338 HT6 O.E. style compressor, Mac’s offers the 6512124 Sanden style replacement compressor.
The Sanden style compressor has been available in the industry for a long time. It is a direct, bolt-off and bolt-on, replacement and has an excellent reputation as a reliable, quality compressor with a cost advantage.
So whether your customer wants an OE style replacement or a compressor with a cost advantage, Mac’s has all your compressor needs.
Oil is an important part of the A/C system. Refrigerant charged oil circulates through the system while keeping 60-70% of the oil in the compressor at all times. This provides adequate lubrication to reduce friction (heat) and wear (metal particles that will cause premature compressor failure and clog condenser passages). When doing a compressor job, it is always advisable when removing the old compressor to drain the oil to see what sort of condition the system is in, and to see how much oil is inside the compressor. This will also help to determine if there is any oil left in the system or if the compressor failure was due to low refrigerant oil.
Never assume a compressor comes with correct amount of oil in it.
The parallel flow condenser is by far the most efficient condenser to use with R134a refrigerant. The multi-channel construction and multiple passes the refrigerant makes through the condenser allows maximum heat transfer. The smaller tubes and wide surface area allows the most refrigerant to come in contact with air flowing through the condenser fins.
The reasons for this efficiency is also one of its major drawbacks. These small tubes that efficiently transfer heat are so small that they trap any contamination in the system that tries to pass through them. Flushing will not remove the contamination from the condenser. This contamination will create a restriction in the condenser and make the high side pressures go up. This forces the compressor to work harder and possibly fail. Contamination in the condenser can also work itself free and end up at the compressor where it will also cause a failure.
Freezing temperatures reduce visibility, impede friction on the road and lower your vehicle’s performance. It is a terrible period for every driver. However, if you have been wondering how you can get your car ready for winter, you’re in luck. We have all the right tricks and tips to ensure that the next cold season is not all doom and gloom.
We have all faced nerve-wracking situations when the temperatures drop. Sometimes your car may get stuck and fail to make it up the hill or just refuse to start in the morning when you’re getting ready to go to work. With a little pre-planning though, you can kiss such scenarios goodbye.
Here are a few areas to which you should pay attention.
1. Is the cold bad for car batteries?
Although high temperatures will take a bigger toll on your car [...]
Finding fluid leaking from your car can be alarming. Some leaks are normal, but most are not. Having the leaks repaired promptly can prevent costly damage to your car’s engine and transmission.
Checking Your Car For Leaks
Unless your car has a catastrophic failure of one of its systems, most leaks will start small. If you suspect you have a car leaking fluid, you can perform an easy check in the following way. Park your car on a level surface. Put a few paper towels on top of a couple of sheets of newspaper and slide them under the engine area.
After an hour or so, pull out the paper and see if there are any drips. Carefully note the color of the drips and if there is any distinct odor. This will help our mechanics get [...]