Why does my air blow only thru the defrost on my 1995 f 150 truck ?
The vaccume line that switches it is disconected or broken,,,under hood or dash,,,,, under hood location ,,,pass side,,,,,firewall,,about 10" down and 12" over will be close near ac/ heater hoses,,, either black or red plastic line,,,under dash loaction,behind glove box or ,, maybe back of temp brokin or undone you will have to track it down,,,, the temp control unit could be bad aswell