the heater has many valve.
first say exactly what you are touch, which lever.
- mode (direction)
- recirc. (fresh or recirc)
- hot >>>>>Cold
if number 3? it controls 1 of 3 things on all cars, a damper, a damper motor, or a water valve.
96 voyager (one of 3 engines)
my guess is the water valve. you think it has one. right.?
and are asking for its location. 1/2 the cars made or more dont have one. So ill look it up in alldata.
front heater not the option rear, correct>?
im, in the FSM now, looking at the heater core photo
its got 2 hoses. and no valve here. on this core side.
surely you can look on the engine side and see if there is a valve on That hose.?
so i get the HVAC chapter schematic
and there are 3 HVAC motor actuators. called motors
blend.
mode
recirc.
so you dont have a valve.! ( we get this post all the time. and is just a goose chase)
so why not start the post with the symptoms ?
The best post is , year car, make model , engine size and
like ,
why dont I have heat in the front of cab in all mode selections
and not recirc and i have the blend knob at max.
did i guess this?
if yes, i guessed right. then
the answer is.
1: is engine coolant at
180F or more? holding when hot?
yes , good,
no, stop do not pass go, and fix that first.
2: if the scan tool shows over 180f
i look for both heater core hoses are equal hot, hand tested.
yes, good
no, the the core is blocked. (not ever flushed every 2 years)
(solution, no pun , flush it now?)
ok the core is hot on both hoses.
the next step is the
most hard.
you need FSM or alldata.com account to see
all blend door tests.
if blend door can fail all these ways
- controls fibbing to the motor
- wire to either bad.
- the motor is bad or stuck
- the blend door is just stuck
no 2 cars have same motors (acutators) and the tests
are wildly different. inlike a simple cable, at all.
i have to look them all up. per car. never guessing.
in the dealer they have a dealer scan tool that
allows them to give the motor commands. manually
then you check the results with the motor and a voltmeter
and is super easy. for them.
but nut use, we need to just use the control and see if the motor
cycles properly.