This afternoon after cruising at about 70 mph for about 30 min with cooling sys doing very nicely - lowing nice cold air, immediately when I released the accelerator to exit the interstate, the heating/cooling sys started blowing very hot air. Is it possible that when I released the accelerator, linkage somewhere may have caught a vac tube and pulled it loose, causing the heating/cooling valve (Is it mono valve?) to switch to "HEAT". After getting home, I checked for loose tubes under hood only briefly before being chased inside by thunderstorm and darkness. BTW, earlier in the day, I had isolated door lock system at "Y" connection (2 yellow tubes) near the brake booster. Tranny shifting is still normal. Compressor engages. Any ideas? TIA

------------------
Wilton Strickland
Goldsboro, NC
91 350 SDL. 81 300D