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Old 07-21-2011, 01:03 PM
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Several A/C Problems

Hey Powerstrokers, this is my first post here, I work for a small private ambulance company with just over 20 Ford 6.0L Powerstrokes ranging from 2006-2009, I'm getting stumped with a small handful that have A/C Problems...the one I'm referring to is a 2006, recently had a compressor and orifice tube installed, now A/C is blowing hot, Low side reading about 30psi High side about 300psi, but fluctuating...outlet of condenser is just as hot on inlet and outlet, but fan clutch is is pulling air, the section of line after the orifice tube is cold going into the evaporator, but warm coming out, through the accumulator and through the suction line to the compressor....any ideas??? Thanks in advance
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Old 07-21-2011, 03:38 PM
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Did you use a vacuum pump to evacuate the system after it was opened up. How long did it hold a vacuum and how deap a vacuum did it get to?
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Old 07-21-2011, 06:27 PM
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Yes we have a Robinair A/C machine, the vacuum was at about 28inHg, this is after we put it under a vacuum for 15 mins and waited an additional five mins, no loss of vacuum

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Old 07-21-2011, 06:31 PM
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Also found out that the accumulator was never changed in the process....strong possibility the cause of problems????

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Old 07-21-2011, 06:31 PM
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if the low side is sucking down to 30psi that should be plenty to get cold air without icing the evaporator

what are your cycle times like? fast?

I don't work on e-series but do they have a heater control valve that stops coolant flow to the heater core?
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Old 07-21-2011, 06:51 PM
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The compressor is constantly running, this guy changed the cycling switch on the accumulator, and still stays engaged at all times....and I have seen a heater control valve for the rear HVAC unit, but not the front, just blend doors

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Old 07-21-2011, 06:59 PM
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With a hot cab and an evaporator pressure that low. You are low on charge or a door in't in the right spot. The head pressure is so high because it's at idle and low air flow.
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Old 07-21-2011, 07:13 PM
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Quote:
Originally Posted by Headbanger View Post
Yes we have a Robinair A/C machine, the vacuum was at about 28inHg, this is after we put it under a vacuum for 15 mins and waited an additional five mins, no loss of vacuum

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thaqts not low enough. 28inhg after fifteen mintues tells me there is a leak you should have seen 29 or more unless you have a leak ofr your pump is worn out

Gook luck
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Old 07-21-2011, 08:22 PM
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Those were the pressures after the vaccum and recharge....

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Old 07-21-2011, 08:23 PM
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I'll double check the vacuum reading on that, thanks

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