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Old 08-29-2013, 09:52 PM   #1
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Angry No voltage to a/c compressor

The problem...1994 Dutchstar Ford 460 gets no voltage to the compressor. The clutch was known shorted, and replaced. Still no 12s to the compressor. Apparently the shorted clutch blew a fuse or relay somewhere, but I can't find it. The dash a/c switchchecks out okay. Anyone have an answer for what needs checked? Sure is hot!!! Thanks all.
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Old 08-29-2013, 10:09 PM   #2
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There will be a fuse and a relay, and perhaps problems with the low Freon pressure sensor, unfortunately I can't help with locations ; I know you didn't need to hear that; I just wanted to say hi.
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Old 08-30-2013, 12:08 AM   #3
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You might try putting a jumper wire from 12 v (+) to the clutch wire to see if the compressor works and cools properly. Skip is correct, there is a low pressure switch, usually near the dryer and expansion valve that shuts off power if freon is low. There might also be a high pressure switch to keep compressor off when pressure is too high just after it shuts down. Most chassis fuses and relays are together in a box under the hood.
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Old 08-30-2013, 05:59 AM   #4
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You might try putting a jumper wire from 12 v (+) to the clutch wire to see if the compressor works and cools properly. Skip is correct, there is a low pressure switch, usually near the dryer and expansion valve that shuts off power if freon is low. There might also be a high pressure switch to keep compressor off when pressure is too high just after it shuts down. Most chassis fuses and relays are together in a box under the hood.

With the engine running and AC to max, disconnect the low pressure cut off switch and use a short wire to (temporarily, no more than a few seconds) jumper the 2 terminals. If your compressor engages, you need freon. If it does not, then you have other problems.

If it did not engage when jumped, check if one of the 2 terminals on the low pressure cut off switch has 12 volts. If not, you have a fuse blown or bad relay somewhere.
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Old 08-30-2013, 06:51 PM   #5
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Thanks all for your rapid replies. Yeah, as stated, compressor is new and had to jumper past the low pressure switch to charge the system. That fires up the compressor as advertised, but removing the jump shuts it off. There is a fuse, relay or burned wire somewhere I'm missing. May have to just rewire past it. Thanks all again.
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Old 08-31-2013, 03:59 PM   #6
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If the compressor works with the low pressure sw jumped and then unjump and plug back in and does not work it is only one of two things. Low Freon charge or a bad low pressure switch. All the low pressure switch is is a open and close pressure switch. Enough pressure it closes and completes circuit, not enough pressure stays open.
Hope this helps.
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Old 09-02-2013, 01:21 AM   #7
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If the compressor works with the low pressure sw jumped and then unjump and plug back in and does not work it is only one of two things. Low Freon charge or a bad low pressure switch. All the low pressure switch is is a open and close pressure switch. Enough pressure it closes and completes circuit, not enough pressure stays open.
Hope this helps.
Agree, either low on charge or bad pressure switch. Could be a leak that wasn't found during the repair.

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