rempfer
Registered User
All of a sudden the red 'ENGINE' check light has come on and the temperature gauge is pegged at extreme 'H' (hot) end of the scale. My F250 is running normally (not overheating) so I'm pretty sure either a sensor has failed or some other problem has occurred causing these indicators to misbehave.
I have a schematic which shows a separate wire each for the light and for the gauge coming from the engine sending units. it seems to me extremely unlikely that both sending units on the engine would have failed at the exact same moment, so what would you experts say is really going on here? Could a failed temperature sending unit alone cause BOTH the pegged gauge AND check engine light? The wiring under the hood from these two sensors looks good and the connections to them are clean (corrosion free). Could a blown fuse cause this situation?
Your help in how to proceed to diagnose the problem would be appreciated. The cooling system is working properly so at this point I know for sure that the engine overheating is NOT the problem.
Thank you,
Richard Rempfer
Elma Washington
I have a schematic which shows a separate wire each for the light and for the gauge coming from the engine sending units. it seems to me extremely unlikely that both sending units on the engine would have failed at the exact same moment, so what would you experts say is really going on here? Could a failed temperature sending unit alone cause BOTH the pegged gauge AND check engine light? The wiring under the hood from these two sensors looks good and the connections to them are clean (corrosion free). Could a blown fuse cause this situation?
Your help in how to proceed to diagnose the problem would be appreciated. The cooling system is working properly so at this point I know for sure that the engine overheating is NOT the problem.
Thank you,
Richard Rempfer
Elma Washington
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