K. Evaporator Blower Motor Testing: First do a visual inspection of all
blower parts.
For evaporator fan location see Freightliner ParkSmart documents.
Reconnect any wires or plugs you might have disconnected when removing the
cover. Turn the Parked Unit on and check for 12 VOLT at the unit side of the
wiring harness. If you do not have 12 volt, check fuse F4 and relay LS4. If
you have 12 VOLT main power, check for the signal voltage from pin C 13
(tan wire). You should have 10 volts on low speed and approx. 6 volts at high
speed. If all voltages are correct, reconnect the plug. If fan does not run, it is
defective, and needs to be replaced.
Using a DC ammeter you can check the amperage draw of the blower. Normal
amps approx. 10 on high
Caution: If attempting to connect blower to an outside power source,
internal electronic components are sensitive to arcing or reverse polarity!
Damage will occur!!
L. Compressor Rubber Mounts:
Visual inspection of the compressor rubber mounts may be necessary if
excessive vibration is present. Check for loose mounting nuts. If mounting nuts
and captive studs are ok, vibration could be from the internal part of the
compressor. If so call your Freightliner dealer.
M. Blend Door Actuator: For blend door location see Freightliner ParkSmart
documents
Physical inspection can be seen through the top of the unit by removing the
fuse panel and evaporator blower.
This actuator motor drives the blend door. Each time the unit is powered up the
door sets to full cold. Removing the F 2 fuse will reset the unit and the blend
door.
When in the heat mode the blend door will direct recycled air through the
heater core as directed by the Aux. Control Panel in order to maintain a preset
temperature. The Espar Hydronic coolant heater will provide a constant flow
(Continued on next page)
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