Passenger Compartment Archives - Page 2 of 83 - UnderhoodService
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.

ac odors featured
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.

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.

Underhood Update On R-1234yf Refrigerant

If you haven’t had a lot of experience dealing with R-1234yf in your shop yet, get ready. You’re going to steadily be seeing a lot more of this refrigerant in the coming years. Underhood Service talked with ASE Executive Director of Special Projects Dave Cappert about R-1234yf updates and best practices techs need to know to be able to service these vehicles before one catches you off guard.

2013 GMC Acadia Dash Detail
Jeep Tech Tip: Poor A/C Performance

Some Jeep Liberty and Nitro owners may complain that A/C performance is poor and that the A/C is not cooling enough or fails to keep the passenger compartment cool. This update will provide customers with improved A/C performance.

Jeep AC performance
Gaskets: Ignoring And Top Off Troubles

Engine oil and coolant leaks should not be ignored. Topping off the levels is often more costly in the long run than repairing the leaking gasket or component. Advising a customer about the potential damage that can occur if they decline a leak repair is not a scare tactic, it is important that they know the real price of their decision.

Do Cabin Air Filters Help Winter Breathing Problems?

When some people think about cabin air filters, they conjure up images of summertime, air conditioning and musty smells. The reality is that cabin air filters work the majority of their magic when temperatures drop and cause winter breathing problems.

Turbo Tech: Power Stroke 6.0 Diesel Turbo Control


GM: Eliminating Air Conditioning Odor

Models: 2014 and prior GM passenger cars and trucks Some customers may comment about musty odors emitted from the HVAC system at startup in hot, humid conditions. Cause This condition may be caused by condensate buildup on the evaporator core, which doesn’t evaporate by itself in high humidity conditions. The odor may be the result

GM Air Conditioning odor