Dash AC Compressor drip condensate under rear engine?

dougrainer wrote:
The OPs question is NOT do Dash Ac's drip water. The question is, do they drip water under a Diesel Engine in the REAR OF THE MOTORHOME WHERE THE ENGINE IS LOCATED, where there is NO Evaporator,Condensor/Receiver dryer/Expansion valve, only the lo and hi lines. While the low line can indeed sweat at the compressor, the HEAT of the engine and engine compartment will usually evaporate that small amount of condensation before it can hit the ground. Doug

Correct (as usual).

The OPs question is NOT do Dash Ac's drip water. The question is, do they drip water under a Diesel Engine in the REAR OF THE MOTORHOME WHERE THE ENGINE IS LOCATED, where there is NO Evaporator,Condensor/Receiver dryer/Expansion valve, only the lo and hi lines. While the low line can indeed sweat at the compressor, the HEAT of the engine and engine compartment will usually evaporate that small amount of condensation before it can hit the ground. Doug

univmd wrote:
Is it normal for dash AC compressor/lines to drip condensate under rear engine?

YES.

Warm air can hold more moisture than cold air, this is why the weather bureau reports a "Dew Point" as part of the weather report. IF the temps drop BELOW the dew point, dew forums (Water condenses out of air)

Your A/C may cool the air to the 30's in some cases. (Most cases) well below the dew point.. Thus water condenses out of the air on the evaporator coils (The coolant is what is evaporated, INSIDE the coils, water consenses OUTSIDE.

It has to go somewhere, so it drip, drip, drips out the drip tubes onto the ground.

You home A/C does the same thing.. If it is centeral air then it drips into a drain, Window air drips on the ground.

Roof air on a Motor home usually drips onto the roof, then runs off

Your refrigerator drains either into a evaporation tray or container designed to return the moisture to the air as vapor or in the case of Dometic's out a drip tube that is SUPPOSED to extend out a vent hole and drip on the ground. Many do not and drip all over the connections board inside the outside compartment and cause problems.

For rear engine Diesel the simple answer is NO. usually any condensation on the Compressor fittings or lines will be evaporated by the heat of the engine and components(exhaust and such). I have NEVER (35 years) seen engine Dash AC water. Doug

Yes, the accumulator/dryer will sweat significantly in high humidity conditions. If you can visually see water coming off the A/C components, you have nothing to worry about, perfectly normal.

Hi,

Msot of the freon lines are insulated, except what is in the cooling compartment and the hot lines that do not require insulation.

The cooling coil can collect a lot of water, say a pint every 1-3 hours. The freon lines might get some condensation on them, but not really enough to measure. Your water is probably coming from something else. Check the color. Red, green or yellow all have specific locations in the RV.

Clear can be water. Water can come from a refrigerator or the rooftop A/C too.










Fred.

univmd wrote:
Is it normal for dash AC compressor/lines to drip condensate under rear engine?

all Rv and automotive AC systems drip condensate

Under certain conditions, Yes.