My Bentley shows that both sensors on the thermostate housing on a 87
Vanagon to be for the fuel injection temp sensor and one of those two to be
for the temp gauge as well. A misprint no doubt.  I think that the front
facing sensor is for the injection.  true or false ?
   When diagnosing for terrible mileage, if found that the coolant temp
sensor read to the equivilant of 100 F too cold.  A minute latter when
rechecking it, the reading was fairly accurate.  Do they fail in this
manner, or would it be out all the time?  Is there a ground that could be
intermitant, as my horn doesn't always work due to a bad ground some where ?

Thanks for your help,

Larry