What can cause a heater control valve to crack?
What can cause a heater control valve to crack? Another common symptom of an issue with the heater control valve is coolant leaks. Over time the heater control valve can wear out and crack, which will cause coolant to leak from the valve. What are the symptoms of a bad heater control valve? Symptoms of a Bad or Failing Heater Control Valve. 1 1. Heater doesn’t work. One of the first symptoms of a faulty heater control valve is a heater that fails to produce warm air. If the heater control 2 2. Leaking coolant. 3 3. Erratic heater behavior....