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Can someone tell me what this is?

 
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Old 23 Mar 2010, 09:28 pm
Young Cruiser
 
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Default Can someone tell me what this is?

Here's a picture of the original cooling (radiator) fan that I removed from my 2005 Ltd. Ed. Turbo. I'm not sure what the white/tan colored thing is attached to the pigtail between the square three-wire harness (near driver's side fender) and the two-wire fan connector. I was thinking that it is a ceramic resistor. But I don't know.

Can someone tell me what this is and how it works in the system?

PT Cruiser Forum - NIL8r's Album: PT pictures - Picture
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Last edited by NIL8r; 25 Mar 2010 at 12:22 pm.
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Old 28 Mar 2010, 11:01 pm
Young Cruiser
 
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Default Re: Can someone tell me what this is?

In case anyone else is looking for this info...
See the last post on this link.

2005 PTC GT (TURBO)... 50AMP (HIGH SPEED RADIATO... - JustAnswer
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Old 29 Mar 2010, 05:07 am
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Default Re: Can someone tell me what this is?

That link doesn't help me understand what that "thing" is on your fan.
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Old 29 Mar 2010, 10:26 am
Young Cruiser
 
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Default Re: Can someone tell me what this is?

According to th eauthor of that link, and this was my thought at the beginning, it's a high temperature ceramic resistor.

There are three wires that come from the harness on my turbo model PT. They connect to the two teminals on the fan via the "pigtail" that has this resistor. One wire goes directly to the fan, one goes to one side of the resistor, and the third wire is spliced with a wire that comes from the opposite side of the resistor. That spliced wire runs to the second fan terminal. The ceramic resistor is mounted in the air steam of the fan for cooling purposes. Trust me, it gets VERY hot when in use.

I'm not sure exactly how the system functions, but the supply from the low speed relay passes through this resistor before going to the fan.

Being the ever curious person that I am, perhaps someone could explain the use of this in the system. Does this help to provide the "variable" speed that everyone says the Turbo model fan has? Perhaps the FAN isn't the difference after all.
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Old 29 Mar 2010, 11:16 pm
Young Cruiser
 
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Default Re: Can someone tell me what this is?

Okay. I think I found the final link to the puzzle.

I'm now thinking that this is a thermistor. A thermistor has a high resistance when at "normal" temperature. As the temperature rises, the resistance drops. This would work to provide a variable speed to the fan when in low speed mode.

Fan first comes on by way of the low speed relay. At this point, the thermistor is cool and carries a high resistance. This makes the fan run at a low speed. As the temperature rises, the resistance drops allowing more voltage to the fan, thus causing the fan to run at a higher speed. When needed, the high speed relay kicks in. Remember I mentioned the third wire? This is from the high speed relay and bypasses the thermistor, applying full voltage to the fan.

So, the fan itself doesn't appear to be "variable speed". It's speed is controlled by the thermistor that is tied into the low speed voltage supply.

Hopefully this will help someone else that is having doubts about fans on turbo and non-turbo models.
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