RE: Electronic Temperature Control
Mike, this is becoming a common problem on the LS. The DATC
system uses what are basically two heater cores which are fed coolant through two sets of heater hoses. When you demand A/C, these hoses are blocked off by an electronically controlled Dual
Shutoff Valve located low on the right hand side of your rad. This
way, the A/C evaporator doesn't have to overcome the heater cores
when cooling. These valves are developing a habit of sticking open. Another example of everything old being new again;
Ford used to have cable operated versions of these all through the
60's and 70's!
I'm suprised your dealer hasn't heard of this. Ford has released
at least two Special Service Messages and a full TSB about it.