LOW VACUUM PERSSURE
Question:
standard vacuum pressure on an 87 GMC JIMMY is between 18 and 22 PSI what should I look at , if the pressure is only 6—8 PSI the only indication I have noticed is the vacuum actuated door in the A/C system . the door doesn’t actuate to mid level blow . it stays on the floor level only . thanks for any help Brian
Response:
got any vacuum leaks? You must somewhere so replace or check all vacuum lines – Hide quoted text — Show quoted text – >standard vacuum pressure on an 87 GMC JIMMY is between 18 and 22 PSI >what should I look at , if the pressure is only 6—8 PSI >the only indication I have noticed is the vacuum actuated door in the >A/C system . the door doesn’t actuate to mid level blow . it stays >on the floor level only . >thanks for any help Brian
