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High duct temps

mastersir on Mon July 13, 2009 7:13 PM User is offline

Year: 2000
Make: Ford
Model: Taurus
Engine Size: 6 Cyl
Refrigerant Type: R134a
Ambient Temp: 90
Pressure Low: 45
Pressure High: 240
Country of Origin: United States

Discharged and vacuumed system for 1 hour. Vacuum held at 28 for 30 Min. Added 34 oz R134a. Pressures are 45 low 240 high. Vent Temp about 68 at 2000 rpm. condenser fans running ok, sprayed water on the condenser, high side pressure dropped but vent temp only went down 2 or 3 degrees. Heater/AC blend door appears to be working OK. Need help. Any suggestions? Thanks.

dasinc on Tue July 14, 2009 3:40 PM User is offlineView users profile

At what temperature were you taking your readings? Readings should be taken at a high idle, about 1500 rpm's. Does the accumulator and suction line feel real cold to the touch? If so it's possible that you have either hot water or hot air defeating the a/c. If the accumulator is pretty cold, try squeezing off the heater hoses and see what that does to your vent temperature.

Take care,


[email protected]

mastersir on Tue July 14, 2009 7:24 PM User is offline

Thanks for the reply. I was thinking it might be something like that. I took my readings at about 90 degrees outside temp, all windows and doors closed, AC on max and 2000 rpm. Both the accumulator and suction lines are cold to the touch. I'll clamp off the heater hose tomorrow and let you know what happens.

Chick on Tue July 14, 2009 8:45 PM User is offlineView users profile

Be sure to clean the condenser and area between it and the radiator, must be clean to allow proper airflow at those ambients.. Also make sure the fan(s) are working properly..

Email: Chick


Freedoms just another word for nothing left to lose

mastersir on Wed July 15, 2009 2:15 PM User is offline

Clamped off a heater hose and vent temp went down 25 degrees. Nice and cool now. Thanks for the suggestion dasinc. Also the face of the condenser was clean but there was quite a bit of junk between it and the radiator. Thanks Chick. I think I'll install a cut out valve in the heater line to fix the problem. I sure am learning alot from this forum.

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