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Old 11-02-2008, 11:09 AM
94mgm's Avatar
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Is the 84' 300D expansion valve supposed to have a bulb?

I just looked at my Expansion valve and all i can see is a short peice of copper wire attached to it. Is it not supposed to have a bulb attached to the expansion valve leeding to the exit line of the evaporator? I have a feeling that my A/C could blow colder and im wondering if new expansion valves come without bulbs attached to them and weather im supposed to attach one or not. How would P1 pressure otherwise be regulated with other connections such as electronic or bulbs.

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Old 11-02-2008, 04:57 PM
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Old 11-02-2008, 05:05 PM
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I'm talking about the Metal bulb that sits at the end of a copper string which usually attaches to the Evaporator outlet and opens the expansion valve acting against the spring pressure and gas pressure. My, EXT (expansion valve) is new and i don't see it attached to anything. Is it just preset to act as an orifice or should it be attached and regulate the output to the low side ie, evaporator?


Last edited by 94mgm; 11-02-2008 at 05:19 PM.
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