usa car? 4.0L?
1990 is super old jeep.
XJ begam in 1984 to 2001
the became KJ
quotes first
The vacuum switch controls vacuum to
defroster, floor, panel and fresh/recirculated air vacuum motors, as
well as a vacuum-actuated heater control valve (water valve). The
heater control valve closes when vacuum is applied to it.
The A/C switch is closed when the lever is in any of the A/C
modes (MAX, NORM or BI-LEVEL). The temperature control lever (lower
lever) moves a cable that controls the position of the blend-air door
in the heater case.
the controls on the dash control all vaccum
vacuum input from engine intake plenum port. 20"Hg at idle
no probem told at all just vugue,heater deal.
is the heater dead
or heater bend door dead
or heater water control valve dead (vacuum side dead) or just jammed. closed. we use a hand vacuum pump to test all vacuum servo slaves, and to see if vacuum commands are dead to any hose with a vacuum gauge.
or is this a pure dash vacuum controls all dead for all.>?
blower not dead on high?
here it is , All i need is this to fix it.
vacuum only map
if the question was water(not told)
then the answer is violet.
there are air valves and water valves both./
air valves are called xyz doors.
on hinges.too, axle hinged doors.
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