03 Expedition a/c not cooling

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May 30, 2013 | 05:26 PM

daveplot

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03 Expedition a/c not cooling

2003 expedition, 5.4. Two years ago I has the a/c recharged. Now with the hot days starting it isn't cooling properly. Front a/c cools to 70f and rear a/c doesn't cool at all. Either the compressor isn't running at all or it's running constantly, it isn't cycling. Low side pressure was 40psi, based off refill can gauge I took it to 45psi. Ambient temp of 90f. No change in operation. There is a constant drip of condensation from the front a/c, nothing from the back. I checked the fuses. Any ideas?

May 30, 2013 | 07:03 PM

alloro

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Based on the fact that the compressor does run and you get condensation drips, I'd say that maybe the blend door isn't moving all the way over to the cold side.

May 31, 2013 | 05:47 AM

daveplot

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Quote:

Originally Posted by alloro

Based on the fact that the compressor does run and you get condensation drips, I'd say that maybe the blend door isn't moving all the way over to the cold side.

That sounds like it could be it for the front. Does the front blend door effect the cooling of the rear A/C?

May 31, 2013 | 09:58 AM

daveplot

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Ended up taking the truck into the Dealer for diagnostic. They said the compressor was weak and wasn't building up enough pressure to power the back unit.