36
A/C systems
I-
Tie-in systems (tied-in to the chassis and uses its compressor)
Dash fan blows warm air: If your AC system is tied into the OEM compressor, and you
do not have a condenser, the issue will be on the chassis side. If your vehicle is equipped
with a condenser, listen to see if it is working correctly. If not check fuses and relays.
When you take readings for the add-on AC, the thermometer must be in front of the
evaporator’s air vent. Blown air should be ± 20 degrees lower than outside temperature.
Dash fan blows cold air, evaporator blows warm: If your bus is equipped with a
condenser, you may go outside the bus to listen if the condenser is engaging when you
put your AC vent button on High, check if the evaporator is working as well. If one of
them does not work, check fuses and relays. If components are working, you need to
bring the bus to an authorized repair center as the issue may also be caused by a
malfunction of the compressor, a clogged condenser or an electrical issue in the parts.
II-
Add-on systems (Second compressor giving a separate AC system to the chassis)
Evaporator blowing warm: If your bus is equipped with a condenser, standing outside
the bus, listen to confirm if the condenser is engaging when you put your AC vent button
on High. Check if the evaporator is working as well. If one of them does not work,
check fuses and relays. If components are working, you need to bring the bus to an
authorized repair center to check for leaks. The issue may also be caused by a
malfunction of the compressor, a clogged condenser or an electrical issue in the parts.
For your information, fuses and relays for these systems are located in the following
areas.
MCC (Mobile Climate Control): Relays can be found in the electrical panel above
driver on Micro Bird G5 vehicles. They will be located underneath a grey pad on
the wall behind the driver in MBII vehicles.
ACC (Climate Control):
Relays can be located either in the electrical panel (G5),
behind driver (MBII) or inside the evaporator.
Battery drainage:
Make sure all systems powered by the battery are deactivated when leaving the bus.
Check to see if entrance door stepwell light stays on after door is closed, if so, adjust
entrance doors as shown on page 38 of this manual. Disconnect big options that are
connected directly to the battery such as the lift door to see if it helps. If no diagnosis can
be made, contact your Micro bird dealer for instructions. The body options will need to
be removed from the chassis battery to isolate issue to the chassis manufacturer or to an
option installed by Micro Bird.
