Question about Cars & Trucks
5.8 Liter 1995 F150 PU running rich and I also have a problem with A/C vent switching from Dash to Defrost under Load
There is a vacuum line going through the fire wall into the cab most pickups it is located right in the middle of the truck, this line controls the selector for that a/c vent problem, locate it and itll most likely fix both problems. GOOD LUCK!
Posted on Sep 21, 2012
what position is the control switch in? does this occur when accelerating?
the door that directs air flow is controled by a vacuum motor. the default position for the door directs air flow to the defrost vents in the event of vacuum loss to ensure the windsheild will be clear of mist. if there is a small leak, vacuum will temporarily be removed when accellerating and the motor will revert to the default position. there are vacuum lines from the control knob to the motor you must check these lines for leaks. the diaphram in the motor may be bad. also check the main vacuum supply line to the control knob. usually red in color. if there is a vacuum storage cannister. it may be leaking. this cannister will maintain vacuum for the circuit when accellerating. engine vacuum decreases when accellerating.
Posted on May 31, 2010
LOOK AT THE WHITE PLASTIC HOSE GOING TO THE RECIRC VACUUM ACTUATOR UNDER HOOD. THIS IS ON TOP OF A/C BOX BY RIGHT SIDE OF FIRE WALL YOU WILL FIND THIS HOSE IS STARTING TO COME APART REPAIR HOSE AND PROBLEM FIXED.
Posted on Sep 13, 2008
SOURCE: 1995 f150 lightning 351w 5.8l
1 quick check, EGR valve failure is common with 5.8, You can clean it sometimes to see that it works and if that solves your trouble, do replace it. They seem to go every 50,000 or so , usually caused by running injector cleaners that get caught in exhaust as nonburnable.
Posted on Jan 14, 2009
SOURCE: I have a1996 F150 with
this is caused by a loss of vacuum to the AC control head from the engine vacuum storage canister, the line comes through the engine firewall on the passenger side under the dash, remove the kick panel, then unplug the vacuum harness (the lines are plastic) and see if you have a good vacuum signal of about 18 inches and holds steady when engine is revved up, if not check for a kinked hose where it comes through the firewall,also check for a cracks cuts or splits in the rubber vacuum line to the vacuum storage canister under the hood, it is shown in the vacuum diagram part of the emissions sticker under the hood.
Posted on Aug 26, 2010
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