[Vwdiesel] '01 Jetta TDI, Head Gasket

[LBaird119 at aol.com]

In a message dated 10/5/2010 7:03:04 AM Pacific Daylight Time, 
davevw at yahoo.com writes:

> I did notice in my old converted Cabriolet that when I had a bad head 
> gasket, there were wild swings in the temp as the exhaust bubble built up, 
> blocked the coolant flow for a time, and then cleared and released coolant 
> back to the engine. 

  Usually the heater output will do the opposite of the gauge too.  When 
the 
gauge climbs, heat output drops, when the  gauge drops down, you start 
getting heat again.  I've diagnosed a few blown head gaskets simply with 
that.
     Loren