How do I check/ test heater control valve on 1991 Lincoln town car Cartier ? on 1991 Lincoln Town Car

Ac starts cold then warm then cold, blend door free and seems to work.

by in Glen Saint Mary, FL on September 17, 2012
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
ANSWER by , September 18, 2012
It is a vacuum operated valve that you can manually open with a vacuum pump to test operation.