Question about 2003 Ford F150 Regular Cab

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2003 f150 lariat air conditioning recharge

Where is the low side and high side on the air conditioning lines. i have heard that the low side has a blue cap. i do not see a blue cap at all. with the hood up and looking down at the engine, i see a black cap to the left of the radiator about half way between the front and back of engine compartment. on the right side of the engine i see a green cap mounted right above the firewall. need to recharge my air

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  • Anonymous Mar 28, 2014

    i need to remove mirror caps to install chrome upgrade caps on left and right sides of truck

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Just adding to kimberlator, low side with blue cap has a smaller connection for your hoses to connect to . hi side is larger.

Posted on Aug 28, 2008

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Nope, not closest to condensor, is closest to EVAPORATOR UNIT and more exact by the accumulator bottle, there you will find the low side valve to recharge your a/c.......is the thicker line....... not try to use the thin line......be careful.....

Posted on Aug 15, 2008

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The fitting for the low side is under the plastic housing on the firewall on the passenger side, very hard to see. mine has a black cap on it

Posted on Jun 21, 2009

  • donny jackson Jun 23, 2009

    the high side is located on the aluminum tubing just behind the radiator on the left as you are facing the front of the truck

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The place you need is closest to the condensor..that will be the low side.do not try to add freon to the high side as it will blow the lines. the low side is by the condensor the closest cap to it

Posted on Aug 09, 2008

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