dash HVAC heater fails.
well there are only 2 causes. (macro viewed)
engine bay or cab failures.
engine is
not hot 180F up. thermostat bad.
we scan the PCM see PID data ECT is 150f and bingo bad stat. if stuck there. it is bad. end store and simple fix. new stat.
all fuses checked for good.
next is cause #2 cab parts failing in dash. heater box.
- blower dead on high you never said it works/?
- blend door struck on cold. bad damper hinge stuck or
- bad blend door actuator motor dead.
- dash controls bad.
there is a test for each case covered in the service manual, buy one>?
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