Question about 2000 Dodge Neon

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The copresser cycles no and off and the gauge on the freon bottle was going high to low like there might freon in it

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  • lane28888 Jun 26, 2009

    when the gauge goes from high to low does it mean there is freon in system or should i put more in it



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Just because the guages are moving doesnt mean it is really taking the freon. Does the can get cold when the guage drops. Is it getting lighter?

Posted on Jun 26, 2009


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Have a 1988 Lincoln Town Car, have put in new A/C compressor,new drier, new condenser, new hoses, new evaporator & full of freon. But compressor want cycle, what could be my problem???

If the compressor wOnt cycle, it means that the pressure is not correct. How much freon, (and what type) did you put in, and did you PULL DOWN (with vacuum) the system to about -29 inches before putting the freon in? Did you use manifold gauges? If so, what is the high pressure, and what is the low pressure, at what ambient temperature?

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Did you use the proper gauges to measure the high side and low side pressures as you added the 134 (I assume not Freon)? If not, it's possible you put too much 134 on the high side and either you kicked a breaker for the pressure or you just burned up the compressor.

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How to charge the a/c

You will see a small oblong black tank with a/c hoses going through it. There should be a connector fitting on this tank or very close to it if inline.

Using a a/c gauge, either as part of a charging kit on a can of bottled Freon or a stand alone gauge; attach the gauge to the fitting and read the amount of pressure in the system while the engine is running and the a/c is on.

If you have pressure in the system, it may just be low and adding new Freon will help. Some Freon comes with a Leakstop and oil for the compressor. If adding oil, use a compatible product. There are differences just like in motor oil.

The goal is moderation. There are 2 cutoff switches to protect the system. A high and low pressure cutoff. You want a moderate charge which will center the pressure between the high and low safety cutoffs. This will result in the compressor staying running the longest and cooling the best. Follow the instructions on the kit you may buy.

Be advised in advance...a completely empty system should be Vacuum drawn down. Moisture will leave the system in a Vacuum. You can borrow the machine that does this with a substantial deposit at major Autoparts stores like Autozone. But you need to seal the leak or replace the leaking part if the system is empty. If this is not done, ice wil;l for inside the system.

There are repair CD's for about $8 at some major autoparts stores and they should be very helpful to you. I hope my solution is useful to you.

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it should reads from the manifold gauge on low side 38psi and 180 high side.

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Will only blow hot air ac compressor working and i replaced he blend door actuator still not working

Two possiblities. The freon charge levels will need to known on both the low and high side. with a good unit running the low side with the engine reved up should not be less than 25 PSI and the high side can be 175 or as high as 225-250. if not your looking for the problem, if the low is too high and the high is'nt very high the compressor likl;y to be bad if the low is too low and the high is too high the comdenser is clogged or the air flow might not good though as the fan or dirt not going though. the orfice tube could be stopped up but if it is the compresser is failing. and parts are flying though the system. high on the low side the system could be containated with moisture ( too much in the system ) Evascate and recharge may get ti working playing carefull attention to the charge rate astoo much freaon can do the same thing.

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When i turn on ac it blows hot air

Normally due to low freon. Also, notice if the a/c compressor clutch engages, as it will not if the freon is low.

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Trying to add freon to my 99 gmc sierra, as i add freon i hear the compressor start to come on but turns off after a few seconds,still dosnt get cold

The compressor cutting and out is a good sign that the system is trying to work. Usually when the compressor cuts in and out after a few seconds, it means that the system is not fully charged and more refrigerant is needed. It's a good idea to purchase a gauge that measures the amount of charge in the system. The gauge looks like an air gauge, and they are not very expensive. That way you will know how much more of a charge the system needs. The gauge hooks up to the low pressure valve, just as the charge hose does.

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There is an AC port near the front of the car under the hood, it's a small silver tube, maybe with a cap. Connect a recharge bottle from an auto parts store on to this port and follow the bottle's dircetions.

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You can use those quick fill freon systems from auto zone that has the easy to read Gauge on the bottle. There are some that come with an easy connect hose to.
If you have your own gages and bottle you need to get you pressures right in your high and low side. At most ambient temp. that warrant using your A/C pressures should read about 35 on low side and 65 to 70 on high side.

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I need to add some freon in a 1995 GMC half ton

Richard, if you have gauges then you cant confuse the high and low sides. Are you trying to just add 134a to you system? If your compressor is constantly cycling it could be overcharged or undercharged. You really need gauges or to do a full evacuate & charge. By the way you probably can't blow it up. There should be a relief valve on you compressor to vent refrigerant if its too over charged. That is also NOT the way to get the proper charge.

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