Low Coolant light keeps flashing but radiator and reservoir are full

Asked by Oct 04, 2014 at 03:27 AM about the 2001 Buick Century

Question type: Maintenance & Repair

Repair shop flushed dexcool out then 7 months later the low coolant light flashes. I have
to keep the fans running all the time or it overheats. The radiator was flushed again same
results.The radiator is full as is the reservoir.

2 Answers

95

Try a new cap if you haven't if it doesn't hold pressure it will run hot . also look for a bleeder valve near thermostat or on a pipe near valve cover and bleed all the air out of the lines . some have two valves look close .

30

If it is a recent model car it should be filled under vacuum otherwise air in system affects the sensor and it thinks the system is empty. Most recent GM vehicles are filled under vacuum now, I presume other makes are similar.

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