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How to check coolant circulation

One way to check for proper coolant circulation is to check the upper and lower radiator hoses. The upper radiator hose should be hot, around 190–200 °F. (The safest and most accurate way to get this temperature reading is with an infrared thermometer.) If the readings are correct, the thermostat is probably working properly. An easier, but less exact method is to keep an eye on the temperature gauge inside the vehicle. If the gauge starts to climb toward the red or HOT portion of the gauge, then you most likely have a coolant flow problem and this should be checked right away. Always make sure there is enough coolant in the system.
When having your mobile A/C system professionally serviced, insist on proper repair procedures and quality replacement parts. Insist on recovery and recycling so that refrigerant can be reused and not released into the atmosphere.
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