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ENGINE COOLING SYSTEM CONTROL

  • US 20130255605A1
  • Filed: 03/30/2012
  • Published: 10/03/2013
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A diagnostic method comprising:

  • adjusting a state of one or more cooling system valves to stagnate a first amount of coolant in a first loop while circulating a second amount of coolant at a thermostat in a second loop; and

    indicating thermostat degradation based on a difference between a coolant temperature and a threshold, the threshold based on the state of the valves.

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