Check whether the connection plug of the heater cable is loose. Check whether the fuse (piece) of the heater is heated and deformed, resulting in poor contact. Check whether the heater relay is loose.
The design of GM car series is that the air conditioning mode is set to blow the front windshield! The air conditioning compressor automatically turns on when the outside temperature is higher than! Do not set the mode switch to the glass blowing position, because as long as the mode is set to the glass blowing position, the air conditioner will automatically start the ice machine for demisting.
(1) Functions of air conditioning system: modern automobile air conditioning has four functions, and any of them is to make passengers feel comfortable.
(The air conditioner can control the temperature in the compartment, both heating and cooling the air, so as to control the temperature in the compartment to a comfortable level;
(The air conditioner can discharge moisture from the air. Dry air absorbs human sweat to create a more comfortable environment;
(The air conditioner can absorb fresh air and has ventilation function;
(The air conditioner can filter the air to remove dust and pollen in the air.