Why does my 92 Ford Chateau club wagon AC blows through the defroster vents?

Asked by Oct 05, 2011 at 03:31 PM about the 1992 Ford E-350 Chateau Club Wagon Passenger Van Ext

Question type: Maintenance & Repair

I tracked the vacuum lines to the vacuum actuator that changes the air flow from dash vents to the defroster and found no problems. When I accelerate the vacuum drops causing the actuator to redirect air flow to the defroster vents the dash vents. I'm assuming that there is a vacuum leak up stream from the dash switch/selector but can not find the source of the leak.  Any help is appreciated.

3 Answers

under hood on driver side is a check valve,round plastic part the vac lines hook to is bad,can get at any auto parts store in the help section.

Thanks, couldn't find any check valve under hood on Driver's side. I checked all hoses from the intake manifold (source) to the vacuum reservoir and found no check valves nor leaks in the system. I added a check valve to the vacuum actuator for the a/c / defroster door. It seemed to help some but I still loose vacuum when accelerating even with the check valve added. I have seen technicians add smoke to the intake system to check for leaks. Where might I find this "smoke"?

is at firewall at break booster,close to inner finderwell.is 3 vac lines hooked to it.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

E-350

Looking for a Used E-350 in your area?

CarGurus has 226 nationwide E-350 listings starting at $3,500.

ZIP:

Search Ford E-350 Questions

Ford E-350 Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 320
#2 tennisshoes
tennisshoes
Reputation 230
#3 Paulastudillo
Paulastudillo
Reputation 190
View All

Related Models For Sale

Used Ford E-150
145 listings starting at $3,650
Used Ford F-350
304 listings starting at $6,500
Used Ford F-150
2,229 Great Deals out of 209,422 listings starting at $1,499
Used Ford Transit Cargo
94 Great Deals out of 19,775 listings starting at $13,490
Used Ford F-250
471 listings starting at $3,975

Used Cars For Sale

1997 Ford E-350 For Sale
23 listings starting at $4,950
1996 Ford E-350 For Sale
11 listings starting at $4,500