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Old 07-15-2019, 12:52 PM   #11
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Quote:
Originally Posted by cheap sleeper View Post
Check (at operating temp, of course) what the fans do with ac off vs ac on.
That can help narrow things down a little more for ya.

Sent from my SAMSUNG-SGH-I527 using FF Mobile
Passenger fan is not working again...I did more tests per your question. Cold...Fan Passenger fan will come on when the AC switch is on, only comes on with AC until up to temperature, Once up to temperature if I turn off the AC fan will still be on high until temperature comes down and then it goes into "slow" mode. If I hit the AC button spins up to "high" mode again.

So it seems to me that the the driver side fan is operating correctly. Now my question is are the fans hooked together or does the computer drive each fan independently. Going off the Diagram on this thread they should be hooked up together.

Also the passenger voltage varies from 10.5 volts low speed and 13.2 high speed just like the driver side fan until I put the test light on it then it cuts out completely.
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Old 07-18-2019, 10:48 PM   #12
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Quote:
Originally Posted by Kustom Fabricator View Post
Now my question is are the fans hooked together or does the computer drive each fan independently. Going off the Diagram on this thread they should be hooked up together.
As I stated previously:

Quote:
Originally Posted by Paul1958 View Post
All 00-04 Zetec cooling fans are wired in parallel meaning they should both operate any time the cooling fans are required by the PCM. They are either both running in LOW or both running in HIGH. The PCM energizes either the LOW speed fan relay which powers both fans thru a resistor or the HIGH speed fan relay which powers both fans directly (bypassing the resistor).
If only one fan is running there is either a wiring issue to the 'dead' fan or the fan has failed.

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