What does the R gear on the air conditioning of the old GL8 mean?
4 Answers
When switched to the R gear, the rear air conditioning fan speed is controlled by the rear switch. The following is the relevant content introduction: 1. Body dimensions: The GL8's body dimensions are 5256mm in length, 1878mm in width, and 1776mm in height, with a wheelbase of 3088mm. As a large MPV, the Buick GL8 has a significant advantage in size. 2. Configuration: In terms of configuration, the base model includes the most basic safety features, as well as front and rear parking sensors, cruise control, hill start assist, and other functions, but some details still need improvement. The mid-range model has seen significant improvements in configuration.
Last time when I took my family out in the old GL8, I encountered this issue and spent quite some time figuring out the R button on the AC panel. Simply put, R stands for Rear zone air conditioning control. Pressing this button allows you to independently control the on/off status of the rear AC. As a classic business vehicle, the GL8 often carries VIPs or family members in the back, making this feature extremely important. In summer, I usually start by pressing the front AUTO button first, waiting for the cabin temperature to drop before activating the R mode to send cool air to the rear. In winter, I do the opposite to prevent rear passengers from being directly hit by cold air. The illuminated button indicates that the rear vents are operational. If the airflow seems weak, remember to check if the rear AC filter is clogged with debris. Independent rear temperature control is both energy-efficient and user-friendly, embodying the essence of GL8's design.
When a friend borrowed my old GL8 to transport clients, they asked about the function of the R button on the AC controls. This R stands for the independent control switch of the rear air conditioning system. When pressed, the R indicator light on the dashboard will illuminate, and only then will the rear vents actually blow air. The GL8's rear blower is hidden behind the center armrest. If you notice no air coming from the rear vents, don't rush to get it repaired—first check if the R button is activated. Some owners assume pressing the AUTO button synchronizes the entire vehicle, but the rear AC requires manual activation. It's recommended to turn off the R mode during prolonged parking to save battery, but when transporting elderly or children, it's best to activate the rear heating ten minutes in advance. Older vehicles require extra attention to AC maintenance—clean the air ducts twice a year to prevent odors from affecting the user experience.
A couple of days ago, I saw an 08 GL8 getting its A/C repaired at the shop. The mechanic pointed to the R button on the control panel and explained: This is the dedicated switch for the rear independent air conditioning (short for Rear). Only after pressing it can rear passengers feel the cooling effect. The older GL8 models feature a separate rear A/C evaporator, and the R button controls its relay switch. If you notice the rear isn't cooling in summer, don't panic—first check if the R button is powered on and activated. If the button fails, it might be due to oxidized contacts or a blown fuse. This design is particularly suitable for multi-passenger scenarios, like individually adjusting the rear temperature for infants.
