I'm not sure what you mean by servo set up. It has a wheel type adjustment for temp, and a button with "high", "low" and Automatic. It won't even blow (until it's ready, and then for only as long as it wants) when it's set on high or low. But it does come on sometimes. It may be a ground problem. It's just really weird.

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Willing is not enough, we must do." Goethe

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1951 Chevy 3100

2003 Indian Chief Roadmaster

1983 GMC 1 ton Dually

1982 Chevy 1 ton Dually, service body (sold)

'90 GMC Suburban 6.2 "SS Veg-Burban"
(single tank WVO\diesel conversion) SOLD

'81 300D ~ Mama's car...my job (now my car)(but still my job) SOLD

'83 300sd ~ rescue car SOLD

2005 Ford Taurus (Mama's new car)(NOT my job!)