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Old 08-19-2009, 21:45   #1 (permalink)
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Is My 2004 Mountaineer AC System On Spec?

I had an extra couple of hours today and thought I'd test my 2004 Mountaineer's AC system performance. I don't have access to a Ford Service Manual and was wondering if anyone here could take a quick look at my A/C High and Low Pressure and Temp results (also posted as a PDF in a link at the bottom of this posting).

Thanks for the help!

2004 Mercury Mountaineer

Front and Rear A/C (Dual Evaporators, 56 oz. R134a Full Charge Specification from hood label)

Electronic HVAC Controls

4.0L V6 Flex Fuel - All Wheel Drive

Mileage: 47,000 Miles

A/C System never opened since new

Test Date: August 19, 2009
___________________

PRE-TEST SETUP

R134a A/C manifold pressure gauge set connected on low and high sides (± 2% accuracy spec)

System Static Pressure – Engine cold:

Pressure: 104 psig both sides

Ambient Temp: 90°F Relative Humidity: 35%

Front end parked shaded in the garage (including the dashboard) with rear cabin in full sun

High speed shop fan blowing into front grill across radiator and condenser cores

Engine started on Max Cool 60°F with F & R fans on low for 5 minutes to stabilize AC System

All windows Full Open with Doors and Tailgate closed

Verified HVAC Recirculation Door working properly (recirculating in Max Cool Mode)

Engine fan under the hood also running constantly

Max Cool Mode (recirculating) set to 60°F with A/C cabin fans increased to High

Run for another 10 minutes with windows open before recording pressures
__________________

TEST RESULT #1

Front and Rear A/C Systems both on, Max Cool, High Fans, Windows Open, Tailgate Closed

Engine RPM: 1500 RPM

Engine Fan and the Shop Fan running constantly

Outside Ambient Temp in Shade: 90°F

Air Temp entering Front Grill area: 92°F

Relative Humidity: 34%

Dew Point (calculated): 60°F

Low Side Pressure: 38 psig – steady needle

High Side Pressure: 260 psig – steady needle

Center dashboard air register Temp: 52°F

No compressor cycling, no unusual noises

No signs of compressor oil on system joints visually accessible

High side piping hot to the touch: Approx 148°F from temp gun at High Side test point

Suction side accumulator cold to the touch: Approx 44°F and sweating water moisture
___________________

TEST RESULT #2

Front A/C ON and Rear A/C OFF, Max Cool, High Fan, Windows Open, Tailgate Closed

Run another 10 minutes to stabilize system before recording pressures

Engine RPM: 1500 RPM

Engine Fan under the hood and the Shop Fan running constantly

Outside Ambient Temp in Shade: 90°F

Air Temp entering Front Grill area: 92°F

Relative Humidity: 34%

Dew Point (calculated): 60°F

Low Side Pressure: 30 psig – steady needle

High Side Pressure: 248 psig – steady needle

Center dashboard air register Temp: 47°F

No compressor cycling, no unusual noises

No signs of compressor oil on system joints visually accessible

High side piping hot to the touch: Approx 145°F from temp gun at High Side test point

Suction side accumulator cold to the touch: Approx 37°F and sweating water moisture
_____________________

TEST RESULT #3

Front and Rear A/C Systems both on, Max Cool, High Fans, Windows Open, Tailgate Closed

Run another 10 minutes to stabilize system before recording pressures

Engine RPM: Idling at 700 RPM

Engine Fan under the hood and the Shop Fan running constantly

Outside Ambient Temp in Shade: 91°F

Air Temp entering Front Grill area: 93°F

Relative Humidity: 32%

Dew Point (calculated): 59°F

Low Side Pressure: 54 psig – steady needle

High Side Pressure: 230 psig – needle slightly vibrating (barely noticeable)

Center dashboard air register Temp: 61°F

No compressor cycling, no unusual noises

No signs of compressor oil on system joints visually accessible

High side piping hot to the touch: Approx 140°F from temp gun at High Side test point

Suction side accumulator cool to the touch: Approx 59°F and barely sweating water moisture
___________________

TEST RESULT #4

Front A/C ON and Rear A/C OFF, Max Cool, High Fan, Windows Open, Tailgate Closed

Run another 10 minutes to stabilize system before recording pressures

Engine RPM: Idling at 700 RPM

Engine Fan under the hood and the Shop Fan running constantly

Outside Ambient Temp in Shade: 91°F

Air Temp entering Front Grill area: 93°F

Relative Humidity: 33%

Dew Point (calculated): 59°F

Low Side Pressure: 46 psig – steady needle

High Side Pressure: 228 psig – needle slightly vibrating (barely noticeable)

Center dashboard air register Temp: 56°F

No compressor cycling, no unusual noises

No signs of compressor oil on system joints visually accessible

High side piping hot to the touch: Approx 140°F from temp gun at High Side test point

Suction side accumulator cold to the touch: Approx 53°F and sweating water moisture
______________________

TEST RESULT #5

Road Test at 90°F outside ambient air temperature, no clouds, no wind

RH at 35% and System on Max Cool (cabin air recirculating and windows closed):

Center Front Dash Air Register Temperature (from idling to freeway speeds):

36°F - 38°F Front A/C only

38°F - 40°F Front A/C plus Rear A/C
___________________________________

Above results also posted here as a PDF file:

http://home.comcast.net/~coolviewer/...%20Results.pdf
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Old 08-23-2009, 15:43   #2 (permalink)
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Re: Is My 2004 Mountaineer AC System On Spec?

They appear to be normal. Are you having problems cooling at times?
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Old 08-26-2009, 02:33   #3 (permalink)
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Re: Is My 2004 Mountaineer AC System On Spec?

Quote:
Originally Posted by rtg143 View Post
They appear to be normal. Are you having problems cooling at times?
The system still seems to blow very cold when it's below 90°F outside as evidenced by my Test 5 Results which were on Medium fan speeds. However, I don't have much to compare it against from the past as I rarely drove the SUV (it was my late wife's car and was mostly sitting in the garage for the last six months .... maybe driven once every couple of weeks during that time).

As you may know, there was recently an all-time record heat wave here in the PacNW (+100°F in Seattle) and I had 5 people in the vehicle on one of those days (including myself). The 2 women (one in front and one in back) complained that the A/C was not cold enough even though I had it on Max Cool Recirculating Mode plus Front and Rear Fans on Medium Speed (which seemed to been the most comfortable fan choice after trying all the blower speeds). Maybe it was just the combination of the 101°F weather and the fact that everyone was not properly attired for hot weather (we were all in suits or dresses for a funeral).
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Old 08-26-2009, 07:39   #4 (permalink)
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Re: Is My 2004 Mountaineer AC System On Spec?

I know about the heat wave, I live in Oregon. The area inside is larger on those than a regular car so it takes more time to cool. I would guess the high temps, large area and many passengers are the reason.
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Old 08-26-2009, 13:42   #5 (permalink)
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Re: Is My 2004 Mountaineer AC System On Spec?

Quote:
Originally Posted by rtg143 View Post
I know about the heat wave, I live in Oregon. The area inside is larger on those than a regular car so it takes more time to cool. I would guess the high temps, large area and many passengers are the reason.
Thanks for the help .... I've been driving it daily the last couple weeks and the front vents will almost feel too cold when blowing directly on me when it's 80°F to 85°F outside even when set to non-Recirc mode on low-med fan (39°F from the center register even at long stop lights).

I think I'm good to go for now ..... over 5 years since the assembly date and still blowing real cold (at least when it's under 100°F)
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