Warm down here - - no chirp. I heard the chirp was on the older ones with the small belt. <br><br>FiverBob,<br>My truck was built in December. Would that qualify as one of the older trucks you are referring to? Just going from memory, I thought you have had your truck longer than I have. Regardless the owners manual states the chirp is normal. Mine only does it occasionally after long drives when the engine is at full operating temperature.

 

WOW...a self-priming fuel system?......what'll they think of next?........ Cool.......I wonder if it retrofits to the earlier models?

 

Thanks All,<br><br>Kind of got off topic didn't we? I did read my manual from cover to cover - the first evening I got the truck. But there IS so much in there that it must not have sunk in to my graying gray matter. <br><br>I wonder what the on-board computers think of the power &quot;brownouts&quot; when the &quot;Automatic Air Preheating System&quot; kicks in and out and in and out? ???

 

[quote author=Tob link=board=20;threadid=11447;start=15#109590 date=1046320935]<br><br><br>I wonder what the on-board computers think of the power &quot;brownouts&quot; when the &quot;Automatic Air Preheating System&quot; kicks in and out and in and out? ???<br>[/quote]<br><br>I think the PCM (powertrain control modules) probably run off a lower ref voltage. I know F*rds use 5.0v to the sensors. No way that glow plugs (powerstroke) or grid heaters (Cummins ;D) would drop below 5v when cycling. HTH<br>

 

Mine clicks and dims, it also chirps, and I read the manual. Many many MANY questions asked in these forums are answered in that little book...