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Luc
Dodge Dakota
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6/20/2005
16:36:25
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 Subject: WOT, a/c shuts off
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99 5.2 4x4, when acclerating from stop at WOT with max a/c on, it will blow warm until it shifts, blows ice cold every other time. it has a new condeser and i replaced all seals i could see.
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bykerdude59
Dodge Dakota
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6/20/2005
17:39:52
| RE: WOT, a/c shuts off
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I have heard from lots of past posts that this takes place because the pcm is seeing a need to have full power...so the pcm shuts out the air conditioner.
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daddio
Dodge Dakota
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6/20/2005
17:46:08
| RE: WOT, a/c shuts off
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what he^ said but, it could also be the high pressure switch it the system is slightly overcharged. mine doesn't cut out at all. ('00 QC 3.9 w/std trans) i say this since it seems you recently had some work done on it.
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Big Ed
Dodge Dakota
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6/20/2005
18:45:49
| RE: WOT, a/c shuts off
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Message:
More likely the low pressure switch cutting it off due to an undercharge of refrigerant. When you go WOT, the compressor is really pumping away and the suction side is drawing down, causing the low pres switch to cut the compressor out. When you go faster and the engine is turning more RPM's your pulling more air over your condenser so the high side should be ok.
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Big Ed
Dodge Dakota
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6/20/2005
18:47:55
| RE: WOT, a/c shuts off
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PS: You can have a slight undercharge of refrigerant and the A/C will still work to a certain extent at normal driving conditions. Its when you floor it that this could happen with an undercharge.
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dodgetech02
Dodge Dakota
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6/22/2005
19:14:37
| RE: WOT, a/c shuts off
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this is the way the system is going to work do you want your compressor to be locked in at 6500rpms no it is a safe gard for the compressor.
The way it works is when the pcm see's wot it will un lock the compressor clutch so one it wont come apart and two you can have max power
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Mason
Dodge Dakota
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6/22/2005
20:21:35
| RE: WOT, a/c shuts off
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Quote from my Factory Service Manual:
"A/C compressor clutch engagement is controlled by several components: the A/C-heater control, A/C pressure transducer, A/C compressor clutch relay, evaporator temperature sensor and the powertrain control module (PCM). The PCM may delay compressor clutch engagement for up to thirty seconds."
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Big Ed
Dodge Dakota
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6/22/2005
20:54:43
| RE: WOT, a/c shuts off
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Now that all makes sense. Good job Dodgeteck and Mason.
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