Dash A/C Blowing HOT air after engine is hot
2002 Holiday Rambler Class A - Workhorse 20,000 miles. DASH A/C BLOWS HOT AIR AFTER ENGINE WARMS UP. So far I bypassed the heater hoses with valves. Replaced : New AC Delco compressor, expans...
Forum Discussion
Without seeing the system I can only give a guess. On some of the older cars that I worked on, that had AC, it was very important to make sure that the BOX that contained the AC evaporator coil was sealed. Since the older cars had the AC box under the hood, it was subjected to all of the heat from the engine. The newer cars have the AC box under the dash, on the passenger side of the firewall.
In any case, on most RV's that I have seen, the AC box is under the hood. You will have a door on the AC box that will allow outside air to circulate inside the coach when put on vent. IF this door is leaking any air from not shutting completely, or by being loose enough not to seal, you will be drawing hot air directly from the engine compartment. This would explain why cold engine, cold air...hot engine, hot air.
In any case, on most RV's that I have seen, the AC box is under the hood. You will have a door on the AC box that will allow outside air to circulate inside the coach when put on vent. IF this door is leaking any air from not shutting completely, or by being loose enough not to seal, you will be drawing hot air directly from the engine compartment. This would explain why cold engine, cold air...hot engine, hot air.
