GMC Envoy AC and Heater Controls
GMC manufactured their mid-size SUV, the Envoy, for model years 1998-2000, and then from 2002-2009. One aspect of retaining the comfort level of the GMC Envoy is a steady cabin temperature is essential to driver and passenger comfort inside your Envoy. Routine maintenance of your SUV, therefore, should include inspection of the heat and air conditioning (AC) controls.
Why is there only hot air blowing from the vent?The actuator in your GMC Envoy controls the flow of air, either hot or cold, into the passenger area. The flap opens and closes as the signal moves from the heat and air system to the control unit. If your Envoy does not blow air correctly for the setting, the actuator could be the likely culprit.
Does the Envoy use a blower resistor or control module?The GMC Envoy has digital controls, so your SUV requires a blower control module to control the vehicles interior temperature. A blower resistor regulates the internal temperature of a manual HVAC control system. Each of these parts controls the temperature, but they are wired and perform differently.
What are the symptoms of a failing blower control module?The blower control module on your GMC Envoy does exactly as the name implies. It controls the air that blows into the vehicle. If the fan is continuously running, your SUV blower control module might need replacing. The fan should stop running once it reaches the required temperature. Another indication is when the fan will not run. This inaction can cause your vehicle to overheat, and you should check it immediately. Finally, if the blower runs but only at a high level, that indicates the control module is failing.
What does a GMC Envoy AC pressure switch do?The AC pressure switch on your GMC model tracks the pressure of the coolant. There are a few signs to look out for when the switch might need replacing. One is when your air unit turns on and off quickly by itself. Other symptoms include your car not being cooled and the compressor not engaging.
Keeping the AC units pressure switch maintained will extend its life. It can be damaged if the switch indicates it is running too low, as there is not enough oil for operation. If it is higher than it should be, the unit can overheat.
Do the AC control switches affect the GMCs engine operation?Numerous variables come into play when you operate your cars AC system. One is the age and condition of your vehicle. Most cars produced after 2000 are designed to automatically shut off the AC through the relay switch when it reaches the designated temperature.
The ACs compressor is directly attached to the engine by a belt and needs the engines power to operate. Both parts should work in sync to keep the engines RPMs at optimal operating capacity. Keeping your GMC maintained and serviced correctly is the key to its performance.