Uni-Select Launches New Telematics Solution For Repair Shops
Uni-Select Inc. has announced the introduction of a telematics solution, powered by Delphi Automotive PLC, for all 5,000 repair shops within its network in Canada and the United States.
Why Oil Balancing Is Critical When Replacing A Compressor
The purpose of oil balancing is to make sure the amount of oil in the A/C system remains at the correct level. The first thing to consider when performing the process is the amount of oil contained in the replacement compressor. This can vary from a full charge of oil (8 oz./236 mL), to a half charge of oil or no oil at all. If oil is contained in the replacement compressor, it will have to be removed and reinstalled in the correct amount to properly balance the system.
Fuel Trim Diagnosis And O2 Sensor Performance
A useful diagnostic tool is to determine if the fuel trim problem exists in more than one engine operating range. Fuel trim should be checked at idle, at 1,500 rpm and at 2,500 rpm. In addition to these no-load checks, drive the vehicle at various steady load conditions and watch for fuel trim variation.
Tech Tip: The Hybrid Compressor – Know The Difference
HVAC systems differ from one hybrid to the next, and some systems have used a scroll compressor, which can be powered via a belt when the engine is running, or electrically when the engine is off. Most of the newer hybrids have changed to an inverter compressor, which is a high-voltage electrical motor.
Tech Tip: A Day In The Life Of A Contaminated O2 Sensor
Since the oxygen sensor is in the exhaust stream, it can become contaminated over time. Much like a spark plug, the oxygen sensor can be examined and “read” to determine what the cause of contamination might be.
A/C Update: Compressor Inspection May Lead To Worn Clutch Problem
When a customer comes in complaining that their vehicle’s A/C system is working improperly, the problem can stem from a number of things. And the best way to begin any A/C repair is with a thorough inspection of the components. After checking components like the belts, the hoses and the related connections, the next step is a visual inspection of the A/C compressor.
BMW Feature: Understanding Variable-Capacity A/C Compressors
Diagnostic Specialist Sergio Fernandez discusses the ins and outs of the swash-plate compressor and how its variable cylinder displacement allows for the most efficient HVAC operation and boosts fuel economy.
Diagnosing And Replacing Oxygen Sensors
An oxygen sensor test can be used to assist technicians in verifying the oxygen sensor operation, but it should not be the only test used to determine if a sensor should be replaced. Most scan tools have an oxygen sensor tests function (also known as Mode $05), which allows a technician to view the data readings for the oxygen sensor(s).
Tool Tip: General Practices When Using Refrigerant Leak Detection Dye or an Electronic Leak Detector
Leak Detection Dye 1. Operate the vehicle for a minimum of 20 minutes with the compressor running to circulate the leak detection dye throughout the air conditioning system. For passive or intermittent leaks, it may take longer than 20 minutes for the dye to find the leak and be visible during the inspection. 2. Use
Why Do Mass Air Flow (MAF) Sensors Fail?
Contamination is a key reason why MAF sensors fail and require replacement. As air, dirt and other debris get into the sensor, the parts become contaminated and fail. Drivers often notice sluggish performance, rough idling, poor acceleration or even stalling. There may also be a more frequent need to refuel.