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'98 Expedition not cooling well

VegasGMC on Sun July 05, 2009 5:37 PM User is offline

Year: 1998
Make: Ford
Model: Expedition
Engine Size: 4.6
Refrigerant Type: R134
Ambient Temp: 103
Pressure Low: 55
Pressure High: 250
Country of Origin: United States

Forgot my temp gauge but it felt like the dash temps were in the 50's and roof vents were blowing alot colder. I ran the engine at 1500 rpm but it seemed like it wasnt taking any charge. Pressures stayed the same after 20 minutes and the refrigerant can didnt get cold. The truck has 170k miles. Thanks

Chick on Sun July 05, 2009 7:13 PM User is offlineView users profile

You need a little more info here, are you just trying to top the system off? or did you start from a deep vacuum? If you are trying to top it off, why, is there a leak? of just not cold enough? You will need the vent temps, because if you have a 50 degree drop in vent temps at 103 degrees, I think it's fine, but I can't remember when It was 103 in New Jersey....

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

VegasGMC on Sun July 05, 2009 9:07 PM User is offline

I think it does have a leak. Those pressures seem low to me. I was trying to top off the system with R134 that has dye in it. The last time I drove this truck with the a/c on it was alot colder. Its my aunts truck and she says its not cooling down like it should. thanks

VegasGMC on Tue July 07, 2009 8:56 PM User is offline

It was just 100 degrees today. Pressures are the same. Dash and roof vent temp is 68 on recirculate. My 06 Xterra got down to 45.

bohica2xo on Wed July 08, 2009 2:58 AM User is offline

250 psi on the high side @ 1500 rpm & 100f ambient? Or was that an idle pressure reading?

With that kind of mileage on the clock, both the fan clutch & compressor are suspect. The "55 psi" low side would be ok if that was doors open, cabin fan on highest speed at idle.

Check the fan clutch airflow issues the usual way - water mist on the condensor & see if the high side drops like a rock.

Do the full load test. Doors open, cabin fan on highest speed, run engine @ 1500+ rpm for 5 minutes. Record pressures while engien is running 1500+ rpm. Record vent & ambient temps.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

VegasGMC on Sun July 12, 2009 5:59 PM User is offline

At 1500rpm and 105* the high pressure was 250lbs and the low was 50lbs with center vent temp at 65*. I sprayed water on the condenser and pressures dropped to 150/30 and vent temp stayed the same. Pressure dropped pretty quickly, about 5 seconds. Fan clutch doesnt feel like its locking up but its not free wheeling either. Thanks

Cussboy on Sun July 12, 2009 7:24 PM User is offline

Those pressures dropped pretty quickly, sounds like a condenser-cooling issue. Here in Arizona I've been figuring a new fan clutch every six years....

Chick on Sun July 12, 2009 10:41 PM User is offlineView users profile

I agree fan clutch and possibly compressor.. At those ambient a few more ounces could make a difference though..I donl't deal in those ambients (Thank god, I'd be dead)..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

bohica2xo on Sun July 12, 2009 11:36 PM User is offline

It is low on charge, and the fan clutch is tired.

Check the air path carefully, and clean it. A modular ford will not overheat with a dead fan clutch, but the A/C sure does not work well.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

VegasGMC on Tue July 14, 2009 8:23 PM User is offline

I'm replacing the clutch this weekend. What pressures should I be looking for at about 110* ambient?

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