Do modern vehicles have sight glasses on the receiver/dryer or at least the liquid line? My 1996 Toyota still does.

no, most do not. They expect you to use a gauge for accuracy. This said, manifold gauge sets do have a sight glass.

I might add that some current construction equipment still uses a sight glass

I see less and less of them. They’re not quite as useful on cars made since the mid 90’s.

My 2003 Camry has one. Just used it the other day as a point of verification in addition to the gauge reading…

I have seen those sight glasses in the gauge set. It looks like it visualizes the flow quality of the CHARGE line. How could you get the sight glass to visualize the liquid line flow? You would have to get the flow going from the high side hose to the low side hose i.e. in series with the liquid …

[image] researcher: How could you get the sight glass to visualize the liquid line flow? Easy, when it’s low on refrigerant, there are entrained bubbles that are easily visible through the sight glass. The sight glass I am referring to is part of the vehicle’s AC system. I watch both the ga…

you do not want to open both valves, high and low side, at the same time when charging your a/c. Only the low side should be opened and the high side closed. As a matter of fact I do not even connect the high side to avoid accidentally having both sides open. The bubbles you see in the sigh glass a…

kurtwm2010: The bubbles you see in the sigh glass are produced by the flow of refrigerants through the gauge set, sight glass, and then to the a/c system through the low side connection. So this only works while filling, right? So it’s not a substitute for a sight glass in the system.

the sigh glass in your car, if it has one, servers the same purpose as a sight glass in a manifold gauge set. No difference whatsoever.

The sight glass is to view the liquid line and when operating properly fully charged there should only be liquid, i.e. no bubbles of vapor visible. Also, if air is left in the system it will appear as bubbles regardless of the pressure and level of charge. The sight glass on a charging manifold wil…

A/C Sight Glass?

General Discussion

asemaster August 9, 2016, 3:23am 18

The car’s sight glass is never on the low side. It’s always on the liquid leg of the high side.

The sight glass on the gauge set you hook up to a car is useless for determining charge. There’s no refrigerant flowing through it when the system is running.

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A/C Sight Glass?

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