i own an 05 crown victoria sherrifs interceptor

and 6 months ago the turn signals quit working the heat quit working and also the air conditioning all at the same time what would cause this
i have eliminated fuses and wiring
i am thinking that its a relay or something like that
has anyone had this problem and if so please share
i am new here i just found a forum that delt specifically with crown victorias and this was it so
thanks in advanced from me and my wife and kid who suffer in the heat cause of the no air thing
to explain more the air vents have no air going thru them what so ever the heat how ever on defrost works some what but not what it should

Cubpak89....heat & a/c conditions...issues can be different w/models-yrs & even engine size....we need to know yours to be more specific....

The OBD1 or OBD2 might not catch your mentioned issues...it sounds like a electrical w/turn signals while the heat & a/c might be in the blower area or 'thermal blower lockout switch' ( if so equipped )...

Try your local library's database research to source a Haynes, Chilton's or AllData for your particular vehicle...sometimes there will be a trouble shooting section or electrical diagram that might be of assistance...