Ideal automotive vent temp compared to outside temp

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Ideal automotive vent temp compared to outside temp

Postby dsmith » Wed Jun 29, 2005 6:00 pm

What is the ideal vent temperature compared to outside temp for a 99-04 e350 small bus conversion van?
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vent temp fallacy

Postby DNT » Wed Jun 29, 2005 9:39 pm

It is nice to know what the supply vent temp reading is and a high temp is usually a good indicator of a problem, but there are to many factors involved to state that at any certain outside ambient temp that you should have a certain vent temp. The main one being the return air temp which is the vehicles interior temp at the return inlet. If you get a nice 30 to 35f drop dry bulb across the evap (return vent and supply vent) your system is probably doing OK. Ideally a man would want his evaporator saturation temp just above freezing maybe 36 or 37 degrees (30 to 34 psig) with R134a that usually translates into high 30's to low 40's vent temps. What kind of pressure readings are you getting on your vehicle? That would be more useful info than just the vent temp?
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