The AC will quit working when u give it has and start back when u let off

Tiny
STEVENSANFORD
  • MEMBER
  • 1996 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
The ac will not blow good when u press the gas pedal then it starts back blowing good when u let off
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Saturday, August 1st, 2015 AT 3:18 PM

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Tiny
CJ MEDEVAC
  • EXPERT
SOUNDS LIKE A VACUUM PROBLEM/ SITUATION

MOST FORDS HAVE A VACUUM RESERVOIR, WAY BACK IT LOOKED LIKE A METAL ORANGE JUICE CAN WITH A SINGLE VACUUM LINE ENTERING IT. SOME LOOK LIKE A BLACK PLASTIC BASEBALL

THIS THING SORTA "STORES" SOME VACUUM (NOT A LOT) SO THAT WHEN VACUUM IS LOW (LIKE DURING ACCELERATION) ALL OF THE VACUUM OPERATED COMPONENTS WOULD STILL BE UNDER "SUCTION", INSTEAD OF DROPPING BACK INTO A DEFAULT MODE. (LIKE A HVAC DOOR, IS OPEN WITH VACUUM, CLOSES WITH NONE)

SOME PEOPLE EXPERIENCE THEIR HEAT OR A/C COMING THRU THE REGULAR VENTS WHEN ALL IS WELL, THEN SWITCHING TO COMING OUT OF THE DEFROST VENTS OR FLOOR VENTS WHEN VACUUM DROPS OFF.

SO HERE'S A FEW POSSIBILITIES

YOU HAVE A (OR MORE) VACUUM LINES PULLED LOOSE/ CRACKED/ SPLIT/ ETC.

VACUUM OPERATED COMPONENTS, SUCH AS A BRAKE BOOSTER/ PLASTIC THINGS LIKE YOUR HVAC CONTROLS, OR ANYTHING ELSE THAT USES VACUUM IS BROKEN OR CRACKED (NOW SUCKING OUTSIDE AIR)

YOU HAVE VACUUM PORTS/ OR NOZZLES/ OR THE WHATEVER YOU WANNA CALL 'EM ON THE INTAKE MANIFOLD OPEN TO THE AIR (NO HOSES OR CAPS ON THEM) BASICALLY, A VACUUM LEAK

THEN WE HAVE THE WORST CASE

THE ENGINE IS PRETTY WORN, THE PISTONS CANNOT GENERATE THE VACUUM THAT IT ONCE DID (ON THE INTAKE STROKES OF YOUR 4 STROKE ENGINE)

A REALLY WORN TIMING CHAIN WILL ROB POWER AND VACUUM

THINGS THAT COULD HELP THE SITUATION IS A GOOD FULL ENGINE TUNE-UP/ VERIFY THE TIMING IS CORRECT

YOU MIGHT ALSO GET YOU A "VACUUM GAUGE", WITH A LONG HOSE. HOOK IT UP AND RUN IT THRU YOUR WINDOW AND WATCH WHAT THE NEEDLE DOES.

THE "NORM" AT IDLE IS ABOUT 20 Hg (20 ON THE GAUGE!) THE NEEDLE WILL STAY A LITTLE LOWER AS YOU STEADILY CRUISE (MAYBE 15 OR A BIT HIGHER)

LOOK AT MY ANSWERS IN THIS LINK/ CLICK ON THE PICS, THERE IS ALSO A LINK IN THERE THAT WILL ALLOW YOU TO SEE HOW TO DIAGNOSE PROBLEMS WITH THE USE OF A VACUUM GAUGE. SEE THE VERY BOTTOM OF THAT LINK AND CLICK ON THE "SCENARIOS"

http://www.2carpros.com/questions/2010-all-other-cars-how-to-change-gears-for-fuel

RETURN WITH GOOD NEWS!

THE MEDIC

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Saturday, August 1st, 2015 AT 9:56 PM

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