I looked through some of the postings but could not find one for 84 300d.

Where would the lowside valve be for the ac? I need to add freon.
AC was converted to 134 before I purchased it.

Thank you all!

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1999 C230 Kompressor (The Queen)
1984 300d (Driscella) - Sold

The low side line is the (cold) line that runs across the front/top of the engine, right in front of the valve cover. The low side connection is in that line towards the passenger's side.

high side is under car on pass. side, up against oil pan. low side is right in front of your face when you open hood.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

Found it! Thank you. Unfortunately after just adding the freon 134 still did not blow colder. The gage on the freon can said that the pressure was what it should be. Is there a specific pressure that should be used other than what is on the can?

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1999 C230 Kompressor (The Queen)
1984 300d (Driscella) - Sold

Can you tell us the ambient temperature and the vent temperature you are getting?

Ambient temp ~ 90
Vent tem ~ 60

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1999 C230 Kompressor (The Queen)
1984 300d (Driscella) - Sold

That doesn't sound great, does anyone know how much temperature difference he should be getting from a 134a system?

It is probably time to invest in a gauge set so you can check both sides. Otherwise, you're flying blind.