Question about 1998 Ford F150 Regular Cab

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AC blowing warm on 1998 Ford F-150

5.4L V8. AC clutch is engaging. On for about 20 seconds, off for 20 when idling. Seems to be engaging when driving also. Will not blow cold air. Tried to recharge system and it says "full". However, I'm not 100% sure we had the correct port. It was the only port that the fitting on the can would attach to. Would appreciate clarification of low pressure port location and any other advice. Compressor was replaced a couple years ago with new OEM unit. Hot as hell here in Florida and feels like 110 with 150% humidity. The price we pay for the 7 awesome months of the year!

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  • captwmcurtis Jun 23, 2009

    flagcar...

    Would there be any noise inside the cab like water sloshing around or water draining?

  • captwmcurtis Jun 23, 2009

    Okay, I believe tomorrow I will attempt the AC recharge again using your tips Imaginex. What is your opinion of the dryer moisture post by flagcar?

  • captwmcurtis Jun 23, 2009

    Thanks to both of you for the suggestions and I will update this thread tomorrow evening after I attempt the AC recharge again.

  • captwmcurtis Jun 24, 2009

    Okay. Tried the recharge kit today. Low side pressure when compressor running is about 25psi. When it shuts off it goes back up to about 45psi. I am assuming that per the instructions on the can that these are acceptable numbers. Unfortunately, it is still blowing warm air. I would like to clarify the amount of time the clutch is engaged. I posted yesterday it was about 20 seconds. Not true. It's more like 5-7 seconds on, 5-7 seconds off at idle. I've seen other posts that mentioned the orifice tube and one guy had a 2006 that was clogged from the factory, so I suppose it could be that, especially if they didn't perform the swap properly. It was done by a mechanic at a large shop, but you never know...I also read that the control knobs actually have switches that go bad...Any more thoughts anyone? I am going to get it tested tomorrow for sure, but I don't have a mechanic I can trust anymore as most of the smaller shops have closed and even a few of the bigger ones have shuttered. Toilet economy...

  • captwmcurtis Jun 24, 2009

    Thanks flagcar. The low pressure port is on the side of the aluminum cannister that is bolted to the firewall. I believe that is the receiver/drier, no?

  • captwmcurtis Jun 25, 2009

    Final result is in. Imaginex had this one pegged from day one. I broke down and grudgingly drove the truck to a local shop I pulled from a hat(basically). I drove until I found one that wasn't full of customers and wheeled on in. Most shops around Florida here are now offering to pressure check your AC for free, but this guy wanted $34.95 with an instant coupon that brought it to $24.95. I complained, but decided to let him have a look after I explained that the low pressure seemed fine and it was "full" of freon. Ten minutes later he tells me there is some blockage and the refrigerant is 1 pound low. $95 to evacuate the system and recharge it. I didn't believe it would make a difference, but I told him to go ahead. 30 minutes later my truck is blowing ice cold AC for the first time in 4 years. Moral of this story should anyone read this thread in the future: The over the counter recharge kits and their guages are garbage and there are still mechanics out there you can trust, and those who know nothing about the AC system of their vehicle should just take it to someone who DOES!!! I would certainly get a few estimates, but I was fortunate today to pull in to a shop where folks were NOT looking to rip people off. I fully expected them to tell me the entire system needed to be replaced, so leaving there with my wallet a c-note lighter was quite refreshing, pardon the pun. My new mechanic is located at Tires Plus, 7109 State Road 52, Bayonet Point, Florida 34667. 727-863-5493 And for things I know a bit more about, I will look up imaginex here on fixya no doubt.

  • Matthew Boulden May 11, 2010

    Ok, here is the problem. When you recharge the system the compressor needs to run in order to get a good reading. The reason it is turning on and off is the system needs recharged, so you probably are not full and it is giving you a false reading. When you hook up to the large port, the low side, wait for the compressor clutch to kick on before applying the charge. You will notice the compressor staying on longer, if not all the time. I hope this helps, and if you need further help, let me know.

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No, you should not have noise inside the cab.

Posted on Jun 23, 2009

  • Matthew Boulden Jun 23, 2009

    My thoughts would be if you had the compressor changed professionally they would have drawn a vacuum on the system after doing an install and this would have removed all or most of the moisture. Also, they would have capped or closed off the lines during the switch. Yes it could have moisture in it, but it is unlikely to have enough to cause much of a problem. If you had the problem from day one, then yes, but not this long afterward.

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The can will only connect to the low pressure side. Could be a bad drier. If the lines were unhooked for more than 30 minutes when changing the compressor, the drier is probably filled with moisture.

Posted on Jun 23, 2009

  • Mike Phillippi Jun 24, 2009

    The other guy is right. If your compressor was changed professionally, you shouldn't have drawn too much moisture in the drier. How long the lines were unhooked is important though. Also, the compressor will stop running for two reasons. 1)undercharged, or 2)Too much pressure on the high side. The A/C system has low and high pressure switches. If it shows full when trying to charge it, I would assume it has too much high side pressure. This can be caused by moisture in the drier, the orifice tube being clogger, A bad expansion valve, or something as simple as the electric fan or manual clutch fan not working. It is really hard to guess without knowing the operating pressures on both the high and low sides. Most repair shops will hook it up too the gauges for free and give you an idea of what might be wrong. Hope this helps.

  • Mike Phillippi Jun 24, 2009

    If you hear water moving around in the cab, or the floorboard is wet on the passenger side, that is a sign that the system is over or undercharged. You don't always have this symptom though. The drier I am talking about is under the hood, usually close to the low side port you are filling the coolant in.

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