Heating / Cooling Archives - Page 3 of 149 - UnderhoodService
A History Of Automatic Temperature Control

Temperature control has gotten more complicated as manufacturers get more innovative and consumers get more demanding.

Servicing Electronically Controlled Thermostats

When the heater circuit fails, most of the time it will create an open circuit.

Ford F-150: Lack Of Heat In Low Temperatures

This condition may be due to deposits from the engine coolant becoming trapped in the heater core.

Active Grille Shutter Service

Mounted ahead of the radiator, active grille shutters have motorized horizontal vanes that can rotate to block airflow.

Diagnosing Electronically Controlled Thermostats

On these systems, there are two ways the engine management module knows there is a problem.

Auxiliary Water Pump Diagnostics

The auxiliary water pump is designed to circulate warm coolant to the heater core.

Prepare For R1234yf Now

Currently, there are approximately 35 million vehicles on the road with R1234yf in the HVAC system.

A/C Service With The New R-1234yf Refrigerant

Why should shops consider purchasing a new machine to handle R-1234yf refrigerant?

Toyota Tech Tip: Odors In The A/C System

Toyota vehicles may exhibit odors naturally occurring from the HVAC system and/or related environmental factors.

Driveline System Balance Adjustment Using an Electronic Vibration Analyzer

2005 Saturn Truck VUE AWD V6 3.5L VIN 4

VIDEO: Replace The Thermostat With Every Cooling System Job

Andrew Markel discusses the limited lifespan of thermostats, and how that makes it necessary to replace the thermostat as part of a cooling system task. Sponsored by Auto Value and Bumper to Bumper.

Auxiliary Water Pump Diagnostics

A car or truck comes into your shop with a complaint of poor heater performance. The driver complains that on cold mornings the heater will blow cold during the drive to work in rush hour traffic. The car is not overheating and the air is coming from the correct ducts. Your first reaction might be to install a new thermostat and inspect the heater core for a blockage. On the test drive, the system may perform great for you. Is the customer just cold blooded?