Problem w/ intermittent defrost a/c - Honda ATV Forum
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post #1 of 10 (permalink) Old 03-09-2019, 04:22 PM Thread Starter
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Problem w/ intermittent defrost a/c

Have a '11 Crown Vic with 290k miles and I've been having a problem with the windows fogging up all the way around. The defrost seems to be working about half the time. On humid rainy days it'll work for say a half hour keeping the windows clear, then the windows will fog hard for 10-15 mins. And then it might decide to start working again, back and forth it goes. When I started it just now the compressor clutch turns when the a/c is turned on, although I haven't had a chance to observe it when the windows are fogging.


A secondary problem it has is that it only blows air through the vents on the front of the dash, straight out into the cabin. The air flows only very weak out the defrost vent at the windshield or the floor. It does this on all settings. Although this might contribute somewhat to the problem, it seems like the a/c does completely cut out as the windows will still fog hard with the a/c set to on and on full fan. When it cuts off the air in the cabin feels immediately humid. One that that helps somewhat is to turn the temp toward cooler and it seems to not fog as much and gives it a chance to maybe clear the fog some.


Any idea what's causing this or what I should do to start testing?
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post #2 of 10 (permalink) Old 03-09-2019, 06:45 PM
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You either have a vacuum leak or a weak vacuum pump.

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post #3 of 10 (permalink) Old 03-10-2019, 07:19 AM
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If your a/c is not working then the air blowing thru the system is not being dehumidified.

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post #4 of 10 (permalink) Old 03-10-2019, 08:10 AM
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Two problems IMO.
The air blowing incorrectly out the vents could be a problem with the blend door.
The fogging is an A/C problem.
It could also be the control head has a problem.

I would dig around on the net.


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post #5 of 10 (permalink) Old 03-15-2019, 02:46 AM
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i wrote this yesterday, dont know what happened. my mom has a 2001 sable, that had similar problems. i found the taurus forum, and it told how to reset the system, using the buttons that control the cooling/ heat. it worked for her.
if you are low on freon, it could cause systems, similar. you will see the compressor pump cycling, and hear a click sound, ever time it does it.
maybe 10- 20 seconds a cycle. the cycle depends on how low your freon is. the faster the cycle, the lower it is.

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post #6 of 10 (permalink) Old 04-04-2019, 09:13 PM Thread Starter
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I'm gonna assume my problem is being caused by low refrigerant and take a shot at fixing it as cheaply as I can. But at the same time I'd like to take steps at identifying where the leak might be.

So what will this look like? Renting some gauges from the local car store and checking my refrigerant lines? How would you go about this and what readings should I be looking for?

And then if things read low I would get a can of refrigerant with leak revealing dye and put it in the system?

Sorry I'm so remedial here, first time working on an a/c system.
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post #7 of 10 (permalink) Old 04-07-2019, 03:09 AM Thread Starter
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Hooked the gauges up and it seems like I've got a low refrigerant condition. Before turning the engine on both gauges read about 75. After starting the engine and setting the AC on max you could really tell the compressor was cycling fast. The needles cycled every 5-6 seconds...one going up and the other down, then reversed. The blue gauge cycled between 22 and 38 PSI while the red went between 90-140. The outside temp was about 60 F.

From what I've read, especially with the compressor cycling so fast, this indicates low refrigerant. Hopefully my compressor isn't hurt by running it for so long like this.

How do I go about using this 2 gauge setup to add refrigerant? Should I add it through the middle hose somehow or get a can of 134 with a gauge on it and just add it directly from the can?

And how do you know how much to put in?
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post #8 of 10 (permalink) Old 04-07-2019, 06:21 AM
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The kit I bought had a gage with it and a hose, you can only thread it on to the one side. You might need a smoke machine to find your vacuum leak if you don't end up having a weak pump.

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post #9 of 10 (permalink) Old 04-09-2019, 12:51 PM Thread Starter
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After I took the gauges off I noticed one of the schrader valves was hissing, and now the system is down to 0 psi. So I believe a faulty valve has been the culprit all along.

Now that the system is down I'm going to replace both valves, but my regular schrader valve removal tool won't fit down on the valve. The stem of the valve is too long and the tool won't go down around it to twist it out. I need a tool with prongs longer to fit down into the recessed sides of the valve. Does this '11 Crown Vic have schrader valves or a different kind of valve?

Also, when I go to fill the system with refrigerant, do I need to add any PEG oil or just add refrigerant up to the specified capacity?
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post #10 of 10 (permalink) Old 04-23-2019, 12:09 PM
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Quote:
Originally Posted by bradleyheathhays View Post
After I took the gauges off I noticed one of the schrader valves was hissing, and now the system is down to 0 psi. So I believe a faulty valve has been the culprit all along.

Now that the system is down I'm going to replace both valves, but my regular schrader valve removal tool won't fit down on the valve. The stem of the valve is too long and the tool won't go down around it to twist it out. I need a tool with prongs longer to fit down into the recessed sides of the valve. Does this '11 Crown Vic have schrader valves or a different kind of valve?

Also, when I go to fill the system with refrigerant, do I need to add any PEG oil or just add refrigerant up to the specified capacity?
google the question about oil.. i just added refrigerant. i have a long stem schrader valve tool. i found it on a job site. any HVAC parts store should have this or know where to get it. since is is automotive, try them stores as well.

clymers manual,service manual..
"what a good giff, the good lord gee us,not to see ourselves,as others see us"
hard to talk to morons. even more so, when related..
"ya should get 3 people ta smile or laugh every day" all will feel better
"sometimes, when drinking 5 or 6 bud's, nipping JB, Jim Beam, cinnamon in between, i start thinking sideways,,i have too though, ta match the way i walk" ed
"those that dont study history, are doomed to repeat it"
"I HOPE i aint wrote nutting else stupid" "funniest comedy dont need curse words" "teach how to think, not what to" ed
"Genius can be measured,not stupid" Albert Einstein
"when you get to old to learn, then what good are you" ed
i havent done friends list,if i do, R the rest not friends?
2000 450es TRX
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sum humor adds up
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