Originally Posted by cowlitzcoach
Unless the bus is equipped with A/C, retrofitting everything isn't going to be easy.
If you have a Type 'D' FE bus finding space in the dog house for the compressor and all of the parts and pieces is going to be a real challenge.
If you have a Type 'D' RE bus you are going to spend a small fortune in hose/piping and R134a to make the system work. It is a long way from the dashboard to the "front" of the engine where the compressor will be mounted.
If you have a Type 'C' bus finding space to mount the compressor shouldn't be too much of a problem and the plumbing runs will be minimal.
Regardless of the type of bus, you will most likely have to install a different bottom pulley in order to get a place to run the drive belt for the compressor. You may not have enough room to put a pulley that can turn more belts so you will have to end up having to fabricate a pulley to go onto the alternator or air compressor to drive the compressor belt.
If you really need A/C it would be much easier and much less expensive to figure out a way in which to run the roof A/C units or the basement A/C while running down the road and duct some of the cold air to the driver's compartment and dashboard.
my last bus I did some serious custom conversion for dash air... it was a ton of work... under the hood was easy I had a 454 chevy so HotRod air had parts ready to go for chevy big block.. making lines is easy I have the tools for that.. the evaporator set ups were the toughest... I did a closed loop Dual TxV type system which worked well but lots of fab and test and tune to get it right...
do factory air conditioned busses have A/C coils in the defrosters(like cars or light trucks do?)..
or is windshield defrosting just hot driver faces and little round fans when running full of people like in non A/C units?