Climate Control Archives - Page 2 of 84 - UnderhoodService
Drive Belt Checklist: What Are You Missing?

You might have only one chance to sell a customer a new serpentine belt. With belts lasting roughly 90,000 miles, proper inspection at the time of failure is critical not only for selling the belt, but also for ensuring add-on sales and better customer satisfaction.

VIDEO: Using Airflow To Sell Cabin Air Filters

Andrew Markel introduces an inexpensive tool that can assist in selling cabin air filter replacements. Sponsored by Auto Value and Bumper to Bumper.

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Air Conditioning Odor Causes

Air conditioning odors typically result from the uncontrolled growth of bacteria and other microorganisms in the evaporator. Research by independent laboratories has found fungi such as Aspergillus, Cladesporium, Penicillium and others growing on cooling coils and other A/C system areas.

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VIDEO: R1234yf A/C Update

Andrew Markel answers questions about the new refrigerant, R1234yf. Sponsored by MAHLE.

HVAC: A/C Update For R1234yf Refrigerants

The benefit of R1234yf is simple. The new refrigerant lasts only 11 days in the atmosphere compared to 13 years for R134a. This is why the EPA is requiring

Ford Focus: Wet Carpet On Passenger Side

Some 2012-2013 Focus vehicles built on or before 11/12/2012 may exhibit wet carpet on the passenger-side front foot well. This is likely due to leaking climate control condensate.

A/C Diagnostics 101: The Value Of Scanners

Leave it to the manufacturers to take a simple thing like heat and air conditioning and turn it into an electronic jungle of wiring, sensors and computer components. HVAC units have come a long way from when I started in the business. Not that I want to dwell on the past, but it might be a good idea to make sure we understand the basics before diving into the problem of today’s systems. I always feel that if I understand a system fully before doing any repair work, I’m more likely to get it right the first time.

Odors In The A/C: How To Troubleshoot Smells

If you know someone who tells you that his or her vehicle’s air conditioner blows out air that smells like the inside of an old gym sneaker when the A/C is turned on, they are not alone.

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Mercury Tech Tip: Air Conditioner Blows Warm Air

This 1999 Mercury Mountaineer had its door motor and heater door replaced, but the air conditioner still blows warm. Here’s what else it could be.

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Automatic Temperature Control Sensors

When a driver sets a temperature in the control head of an HVAC system, what does it mean to the vehicle? New HVAC systems look at more than just blower motor speed, door position and the high-pressure switch voltage. These modern systems are looking at temperatures inside and outside the vehicle. They are also looking at the overall efficiency of the vehicle.

GM HVAC Door Actuator Motors: Operation And Calibration

There are several types of electrically driven actuator motors used in today’s GM cars, and they all function differently. Keep reading for operation tips.

A/C Compressor Oils: Types, Uses And Differences

A/C compressor oil types can vary due to the compressor manufacturer, refridgerant and OEM requirements. See which oils to use for modern A/C systems.