What happened to Buick Excelle warm air?

The reason why the Buick Excelle heater in Pacific Auto Network is not hot is that the engine water temperature is always in a low temperature state, the signal of the water temperature sensor is abnormal, the heater box is blocked, the coolant flow rate and temperature are not up to standard, and there is air resistance in the coolant system.

Check whether the engine water temperature is normal. If the temperature is kept low and the working temperature is not reached, the warm air will not be hot. Check whether the thermostat has been in a state of large cycle, or whether the signal of the water temperature sensor is true. Is there a big temperature difference between the inlet and outlet pipes in front of the heater box? If so, the heater box is blocked and needs to be disassembled, cleaned or replaced.

Whether the flow rate and temperature of the coolant entering the warm air water tank meet the requirements can be measured by infrared thermometer, and the flow rate can be comprehensively judged by the diagnostic data and fault storage of the detector. Common problems are pump loss and damage, warm air flow valve and coolant circulation valve.

Check whether there is air resistance in the cooling system. The common reason is that the coolant is not exhausted after replacement and the special cylinder gasket is damaged. You can use the standard coolant discharge method to further confirm. (Photo/Text/Photo: Pacific Auto Network Wu Jiahong)