Colman roof ac unit replacement?

j-d wrote:
This is the Coleman WebSite. It should tell you which current model A/C replaces what you have now.
Before you replace, do you know if the Compressor is actually running? If it is NOT, could be something simple keeping it from starting. If it IS running, is the small tube leaving the compressor HOT? Is the larger tube returning to the compressor COLD? Can you measure Current Draw? You'd need an AC (alternating current that is) clamp-on ammeter. If it's running, the AMPS should match the running rating on the compressor tag. If it's a lot HIGHER, compressor is dragging internally and probably running hot. "Could" be overcharged, but hardly possible since it has no service ports. If AMPS are LOW, it's likely undercharged or empty. OR, rare but happens, the motor portion inside the sealed shell has come separated from the compressor portion. Either of those and the A/C is junk unless you have access to free parts and/or free technician labor.
Have you eliminated ducting problems and the position of the Defrost Sensor?

I know the compressor is running and the fan is running. I didn't check the temps on the lines from the compressor. I don't have an AC amp clamp. I replaced the thermostat before this trip and the defrost temp probe is in the correct location. I removed the filter and placed my hand on the evap core. It doesn't get cool let alone cold.

Since everything runs as it did when it was cooling(and freezing up), I don't think the problem is in the ceiling unit. A new roof unit will fix the problem. I hate to spend the money on a new roof unit if there is a cheaper fix, but also think any money spent to have it diagnosed further is money that could go towards a new unit. Camping season is picking up for us and DW said get it fixed. She doesn't want to have ac problems while we are out of town. Last weekends trip was to the local lake, DW and DD stayed at home after hearing the ac was broke.

Thanks for every ones help.