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E-4 error code

E-4 short of gas or no gas. You have to remove all gas and find out leak by pressurizing nitrogen. After find leak to be soldering and again pressurize to confirm no leak.Vacuum and then do gas charging.

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what Freon do I use in a 2004 fleetwood mallard roof top ac unit


You don't, you call a registered refrigeration engineer. Consumers are not permitted to use refrigeration gasses because of government regulations to reduce greenhouse gas emissions and prevent further damage to the ozone layer.. First you have to fix the leak. To do that, they suck out the gas that is in it, keeping it for re-processing, fill it and pressurize it with inert Nitrogen, find the leak, fix it, let the nitrogen out, suck the remaining nitrogen out creating a vacuum, and then fill with the correct weight of Refrigerant gas. You don't have the equipment for evacuation and the gauges to test high side and low side pressure.

Jul 07, 2017 | Heating & Cooling

1 Answer

Are there some simple things that an amateur could check and fix when the ac is not going on?


Not really you have to be a licensed AC installer to remove and install refrigerant gas and check the pressure with gauges. The only thing you can do is check the fuses and that the drive belt to the compreser is not broken and is spinning the pump.

Usually is is lack of gas due to a leak. The won't gas it until they fix the leak. They test it with inert nitrogen, find the leak, suck the nitrogen out and fill with refrigerant.

May 27, 2016 | 2005 Mercury Mariner

3 Answers

Does nitrogen make a difference in tires?


Yes it does and it is important for aircraft tires and tires on higher end race cars but for the average motorist it is complete a waste of money.
It is a means for tire dealers and others to "upsell" customers to a very profitable product that they do not need and will be of very dubious benefit to them. Don't let them con you and here is why if you are interested in reading further.

1. You cannot get pure nitrogen in your car tires unless the tires are completely free of air to begin with and then filled in a vacuum. But they are not. They have air in them when they are filled. Further, unless you test the nitrogen going into your tires from the fill station you have no way of knowing if it is even 100% pure and often it will not be because of quality control issues..

2. Air is about 78% nitrogen in any event. Most of the rest is Oxygen and the remainder other gasses including Co2. Oxygen leaks out through the walls of the tires very slowly over time and what is left is a higher % of nitrogen. Then when you add air to your tires the oxygen in that air will slowly leak out and the cycle continues. So over time, just by adding air to your tires as they slowly lose some pressure, the % nitrogen content will increase as the oxygen will continue to very slowly leak through the fabric of the tire much faster than nitrogen which is very slow.

I saw one independent test which tested the pure nitrogen content of 2 tires, one that had a fresh nitrogen fill and another that had only used air over a couple of years. The tire which had only used air to fill it had a higher nitrogen content. Nitrogen fill = BIG FAIL in that case.

3. If you have paid for a nitrogen fill and you check your tire pressures and find they need topping up are you going to drive around to find a business with nitrogen available or are you going to just top up with air any how? Most people will just add air because they need it now and the gas station is open and convenient.

4. Aircraft and higher end race cars will use nitrogen rather than straight air primarily for one reason:
The pressures in the tires will not increase with heat and decrease when cold. They are stable.
Stable pressures are important for aircraft tires and for race tires(because the handling of the race car can be sensitive at high speeds to small changes in tire pressures. Funnily enough I never used nitrogen in my race car tires and nor did any of my competitors when I was racing. We just did not bother and set our tire pressures knowing how much they would quickly increase after a couple of laps).

But that is not an issue for passenger car tires. You fill them cold at or above the recommended pressure and, when you drive, the tires warm up from friction and the pressure increases by a few pounds which is not a negative issue. When the tires cool, the pressure drops slightly which again is not a problem because you always set your tires pressures cold. When you need to add air you can and you don't have to find a business that can do a nitrogen top up for you.

5. For 15 - 20 dollars you can buy a good tire gauge which you can use to check you tire pressures cold. When you need to add air you can and it is free. Normally I just over pressure the tires by a few pounds at the gas station and adjust them at home with my tire gauge when the tires are cold. It is simple and just check your pressures every 2 weeks or so at home at your leisure with your tire gauge.

Paying a bunch of money for a nitrogen fill and then having to pay again when you need to top them up is ridiculous for a road car. Using Nitrogen is no guarantee against slow leaks in your tires which can occur with a slightly faulty tire valve or a very tiny puncture or a leak under the tire beading where the tire wall contacts the wheel rim. So using Nitrogen does not alleviate the need to regularly check your tire pressures anyhow and to then adjust them when they drop below the recommended pressure or below your preferred higher tire pressure.

6. Finally the proponents of expensive nitrogen tire fills will tell you you need to use nitrogen or your wheels will corrode. They claim that the tiny amount of water vapour in air will cause condensation inside the tire and cause the inner surface of your wheels to corrode. This is complete nonsense. Your car will be dead long before your wheels will corrode from that. Any wheel corrosion that is possible from failure of the layers of paint protection is much more likely from the outside of the wheel which is totally unprotected from the elements, brake dust, scraping the wheels on kerbs and gutters, harsh wheel cleaners etc etc. I am yet to replace a car wheel due to corrosion, let alone corrosion on the inside of the wheel rim protected by the tire. Have you?

Dec 02, 2015 | Cars & Trucks

1 Answer

have 100 amana ptacpthat the evap.is only sweating out about 2 inches from the bottom


Short of gas due to leakage. Check the pumping pressure in discharge side of compressor. If it's more than 250psi, it's confirmed there is leak. Check the unit if there is any oil tracing. Remove all gas and pressurize by nitrogen upto 300 psi and find the leakage with soapwater. Arrest the leak, vacuum and do gas charging.

Aug 18, 2012 | Amana PTC093B50AJ Electric Heat Air...

1 Answer

I have a Pinguino PAC 190 floor model that blinks PF what does that mean?


PF- error code means shor of gas/gas leak. It's not advisable to charge gas without finding out the leak.
To find out leak, remove all gas and then charge Nitrogen pressure up-to 300 PSI and then with soap solution or leak detector element you can find the leak. Arrest the leak by brazing/welding, Again pressurize with nitrogen to confirm no more leak. And then vacumize and do gas charging.

Dec 14, 2010 | DeLonghi Heating & Cooling

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