two years ago had my Freon checked , found a leak at the refill, fixed ran fine. last summer blower came on & off by its self , last winter heat at the outlets but no blower, took the blower out, cleaned and tested run fine, after installation blower ran fine for heat and air con, this spring. Now on air the blower comes on sporadically, now not at all, now have heat coming out of outlets with temp control on cold, pressing high or low or auto still no blower?
so I get heat at the outlets but no blower in winter, now cold at the outlets no blower, just recently get heat not cold at outlets, no blower. since the car is 30 years old, and the fan runs fine when tested, could it be a temperature switch sensor and where is it located, thanks.