AC POOR AT SPEED (70mph) GOOD AT SLOW SPEEDS

tomtown

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My Lincoln
2004 town car signature
cor has great ac at slow speeds but not so much at 70mph

I can ride around all day with my 04 town no problem but take it on the hwy cool but not a good
 
Perhaps the condenser and/or radiator fins need a good cleaning?
 
Perhaps the condenser and/or radiator fins need a good cleaning?
both are spotless i replaced the condenser a year ago
I can ride around all day with my 04 town no problem but take it on the hwy cool but not a good

both are clean i replaced the condenser a year ago
 
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Have you checked your freon pressure? Also is the WOT relay kicking in at speed?
 
Possible issues
Charge pressure is too high
Air in system
Evaporator is icing up
Compressor clutch not staying engaged at higher RPMs

First diagnostic thing to do is get low and high side pressures.
If you do post pressures, include ambient temp

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Stick to one thread
Creating multiple threads to elicit a response tends to drive away your help
Both topics have been merged so the conversation can take place in one discussion.
 
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