A/C only blows thru the defrost vents. 98 F150
Hello. Have a 98 F150 w/4.? Triton V8. Just recently, the air only comes out of the defrost vents. It is still cold, but blowing on a 100 degree windshield here in FL. does nothing for interior comfort. In reading some other posts, It appears I may have a vacuum leak. Where do I start looking ? Any help would be appreciated.