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97 ford explorer takes lonnnggg time to cool

dynamite196 on Mon June 22, 2009 6:31 PM User is offline

Year: 97
Make: Ford
Model: Explorer
Engine Size: 4.0 OHV
Refrigerant Type: r134a
Ambient Temp: 68
Pressure Low: 43
Pressure High: 120
Country of Origin: United States

Hey guys, I need some help diagnosing my system. The problem is lack of cooling/ takes a long time to cool. If I have the a/c on for a good 20-30 mins it will finally start blowing cold air. I'm not sure if the problem lies with low pressures or a problem with the pressure switch. The compressor was replaced in the spring, I did a full vacuum, replaced the orfice tube, (accumulator had been replaced 4 months prior so I didn't touch it). It held vacuum for a good 3-4 hours before I put 24 ozs. of 134a in and worked great (32 and below at the vents). Now a few months later the a/c is practically non existent. The compressor does cycle often (every 15-20 seconds). Pressures are as follows:

low side: 24-43

high side: 70-120

Any help would be greatly appreciated. thanks.

Chick on Mon June 22, 2009 6:37 PM User is offlineView users profile

Find the leak, recover refrigerant thats left, and then recharge the factory amount back into the vacuum.., should cool fine again.. Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

HVargas on Mon June 22, 2009 6:46 PM User is offlineView users profile

You are definitely leaking refrigerant. Common place to start to check would be the manifold hose assembly that bolts to the back of the compressor and go from there. Should be obvious by the oil leaking out with dirt and grime built up on it.

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Contact: Arizona Mobile Air

dynamite196 on Mon June 22, 2009 7:26 PM User is offline

I suspected the manifold myself however it looks clean and dry. The only suspicious spot is the high side valve (ball style valve) but, I sprayed a soap and water mix into the opening and didn't see any bubbles. It's a recessed opening so the soap/water mix accumulates before overflowing the sides, leaving me fairly confident the leak isn't coming from there. Although that makes the oil accumulation around the valve hard to explain.... What do you recommend in the way of leak detection? I imagine an electronic sniffer is the way to go but, I'm trying to do this on a budget and I'm guessing a decent sniffer for a $100 or so isn't going to happen.

HVargas on Mon June 22, 2009 7:39 PM User is offlineView users profile

This is a great way to start. You can inject the dye yourself and look for leaks.
Mastcool Professional UV Leak Detection Kit

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When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: Arizona Mobile Air


Edited: Mon June 22, 2009 at 7:41 PM by HVargas

dynamite196 on Mon June 22, 2009 8:52 PM User is offline

thanks a lot, that should get me started

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