A/C switches from dash vents to defrost vents sporadically
My ranger has started to decide on its own to blow air out of the defrost vents when the selector is set to either A/C, A/C max, or to air for the dash vents. The air switches back and forth from front vents to defrost vents. I have heard of possible vacuum leaks? How do I look for that? What else should I check for?
2000 Ford Ranger XLT 2WD 3.0 V6 FFL
IPF Fog lights, Westin Safari bar, K&N air intake, Wet Okle seat covers, Gibson Cat back Exhaust.