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Old 07-29-2010, 05:34   #1 (permalink)
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A/C is hot at idle ???

I got a 2007 crown vic - 4.6L, At idle the a/c blows hot & the compressor cycles frequently. Once you get moving like around 15 mph or more its ice cold. Anybody have any ideas whats wrong??
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Old 07-29-2010, 07:57   #2 (permalink)
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Re: A/C is hot at idle ???

The cycling is like it's low on freon, but they don't get ice cold driving. See what the pressure readings are.
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Old 07-30-2010, 05:26   #3 (permalink)
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Re: A/C is hot at idle ???

Temps outside were in the 90's over the last 6 weeks here. Well the temperature dropped 25 degrees last night, low humidity now. The car is ice cold at idle today. Gonna take it to the shop next week to have the pressures checked.
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Old 08-01-2010, 01:08   #4 (permalink)
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Re: A/C is hot at idle ???

I'm not smart on AC systems but I'm guessing they all work on the same principle whether it's in your home or in your dashboard. Is it possible for a car's evaporator to ice up in dense humidity? I had a fridge once that would ice up the evaporator coils to a point where the fan couldn't push air anymore and it was always on super humid days when this would happen. Once I got done throwing out spoiled food and mopping up the floor and the fridge, I'd have to let it sit a few hours and empty the condensation tray underneath a few times and it would behave again for a while. I'm told that a car's AC shouldn't have that kind of cooling capacity but a guy with no common sense would question it anyway.
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Old 08-01-2010, 10:08   #5 (permalink)
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cool Re: A/C is hot at idle ???

Quote:
Originally Posted by gottaford View Post
I got a 2007 crown vic - 4.6L, At idle the a/c blows hot & the compressor cycles frequently. Once you get moving like around 15 mph or more its ice cold. Anybody have any ideas whats wrong??
Quote:
Originally Posted by rtg143 View Post
The cycling is like it's low on freon, but they don't get ice cold driving. See what the pressure readings are.
If the radiator cooling fan will not turn on with the A/C on then you will get frequent cycling sitting still and poor A/C. When you start moving, andf get airflow through the condensor, A/C starts working again. See it all the time on PT Cruisers all the time. The low speed fan doesn't come on, the high side pressure skyrockets, and the compressor is shut off. When the high side pressure is so high, you'll notice the engine bog before the compressor is shut off.

Anywho, there is a TSB for the fan motor on the Crown Vic.

TSB 07-9-5

05/14/07

ENGINE OVERHEATING - POOR A/C PERFORMANCE

FORD:
2006-2007 Crown Victoria

LINCOLN:
2006-2007 Town Car

MERCURY:
2006-2007 Grand Marquis

This article supersedes TSB 06-20-3 to update the Service Procedure.

ISSUE
Some 2006-2007 Crown Victoria, Grand Marquis and Lincoln Town Car vehicles built before 8/31/2006 may experience intermittent engine overheating and/or poor A/C performance due to an inoperative engine cooling fan motor.

ACTION
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

WARNING IF EQUIPPED WITH A FIRE SUPPRESSION SYSTEM, THE BACKUP POWER SUPPLY MUST BE DEPLETED BEFORE LIFTING THE VEHICLE.

SEE WORKSHOP MANUAL (WSM), SECTION 419-03 FOR DETAILS.

Verify proper cooling fan operation, and if required, replace the cooling fan with a revised motor and fan assembly. Refer to the appropriate WSM, Section 303-03 for Cooling Fan Motor and Shroud Replacement. If the fan is inoperative, replacing the thermostat will not resolve this issue.

Part # 7W1Z-8C607-B

WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
IMPORTANT : Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

Labor Operation 070905A 2006-2007 Crown Victoria, Grand Marquis, Town Car: 0.9 Hr.
Replace The Engine Cooling Fan, Includes Time To Diagnose Fan (Do Not Use With 8621A, 8621B)

DEALER CODING
CONDITION
BASIC PART NO. CODE
8C607 30
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Old 08-04-2010, 12:43   #6 (permalink)
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Re: A/C is hot at idle ???

thanks for the TSB info. Sounds like others have had the same problem too.
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