Hi, my bus has 2 AC units, both made by transair in 2003. The rear AC unit blows cold and fine, but the front one blows warm. Are they two separate refrigerant loops? I don't think any of the refrigerant has leaked out, so what's some troubleshooting steps? I'd also like to know, if the front one is a seperate loop, can I remove it? The evaporator that sits under the rear floor is taking up space i'd like to put a drawer, and also the one unit keeps the bus cool as is.
AC Blowing warm..
- Thread starter FawnaFox
- Start date
ewo1
SR. MEMBER - 99 Amtran RE DT466E HT 250HP-Md3060
LEt me tell you, from experience, keep both A/c units. I have 2 busses, on with and one without. The one WITH is really nice tor drive, stays real cold on the highway! Minisplits WILL NOT keep up.
There is nothing difficult about servicing these a/c units. I myself have no clue ...I looked high and low for an a/c guy. 99% of the a/c world techs would not touch it!
Before I left from Miami to central TX, I found a bus mechanic from a private bus company, he replaced a filter, 12 feet of damaged line from the compressor to the evaporators and charged them up.
One of the compressors died during the trip so I found another private bus company mechanic who replaced both compressors and recharged the lines. New A/c belt too.
The compressors were pricey, paid $500 each. Labor for everything was another $500. Aligning both compressors was the most difficult part of the whole job.
Each compressor will have it own evaporator and yes you can remove it but maybe relocating it might be the better option!
As far as trouble shooting tips, yes expect a cracked line. They tend to overheat right at the compressor itself. Mine did.
Before you go ripping out that unit, find yourself a private bus company and speak with the shop foreman. Don't go to a DELAERSHIP, you will seriously overpay!
Private bus company mechanics are always looking for extra cash!
In Miami I went to a private school bus company and in Texas I went to a private charter bus company.
Both times were a success!
BTW, there are a ton of threads here dealing with A/c issues. Really good source here, use the search button!
There is nothing difficult about servicing these a/c units. I myself have no clue ...I looked high and low for an a/c guy. 99% of the a/c world techs would not touch it!
Before I left from Miami to central TX, I found a bus mechanic from a private bus company, he replaced a filter, 12 feet of damaged line from the compressor to the evaporators and charged them up.
One of the compressors died during the trip so I found another private bus company mechanic who replaced both compressors and recharged the lines. New A/c belt too.
The compressors were pricey, paid $500 each. Labor for everything was another $500. Aligning both compressors was the most difficult part of the whole job.
Each compressor will have it own evaporator and yes you can remove it but maybe relocating it might be the better option!
As far as trouble shooting tips, yes expect a cracked line. They tend to overheat right at the compressor itself. Mine did.
Before you go ripping out that unit, find yourself a private bus company and speak with the shop foreman. Don't go to a DELAERSHIP, you will seriously overpay!
Private bus company mechanics are always looking for extra cash!
In Miami I went to a private school bus company and in Texas I went to a private charter bus company.
Both times were a success!
BTW, there are a ton of threads here dealing with A/c issues. Really good source here, use the search button!
A Little update, I did manage to find that both units have refrigerant in them, so no broken lines. I have a feeling it could be the thermostat that is not communicating to the system properly, but I also did discover that both units are constantly cycling, which I heard means they're low on fluid, I don't see how not all of the fluid didn't leak out by now, considering that both units were on full blast for the trip home, which in total they were on for about 45 minutes, I feel that if there was a leak, that all of the fluid would have leaked out by now. Rear still blows cold, filters have been cleaned, but front still blows mostly warm, although it seems to try to make a little cold air, It's just not enough. I wish i would've known to check that when i was driving home, but I was more concerned about not bumping into things...
Both units were installed in 2003, and serviced last in 2019, It's possible but I'm not completely sure.. considering they both have fluid in them still.
ewo1
SR. MEMBER - 99 Amtran RE DT466E HT 250HP-Md3060
Have you cleaned the condenser coils both inside the bus and under the bus?
On my rear inside unit, I placed some carboard underneath along with an old towel, sprayed coil cleaner, lots, let it soak in.
To clean it out I used a spray bottle, not a hose. spray bottled it really clean. The towel and carboard absorbed the mess that came falling down. Wasn't bad at all.
There is also a refrigerant filter on the condenser under the bus. That should be replaced but you will have to recharge the system.
On my rear inside unit, I placed some carboard underneath along with an old towel, sprayed coil cleaner, lots, let it soak in.
To clean it out I used a spray bottle, not a hose. spray bottled it really clean. The towel and carboard absorbed the mess that came falling down. Wasn't bad at all.
There is also a refrigerant filter on the condenser under the bus. That should be replaced but you will have to recharge the system.
The compressor up front keeps turning on and off.
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