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2005 496 in a coach, dash AC not working


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wal1809
User

Aug 8, 2020, 2:02 PM

Post #1 of 43 (725 views)
2005 496 in a coach, dash AC not working Sign In

Thanknyou for adding me. I recently purchased a 2005 Safari Simba coach with a chev 496 engine. The dash air does not work.

I started checking. It has pressure in the system. The clutch will not engage. With the engine running I bypassed the low pressure switch. The clutch did not engage. I bypassed the other switch on the dryer as well. Still no clutch engagement.

I switched the relay with another that I know was good, starter relay. I changed the AC blade fuse. Still no clutch engagement.

I checked voltage at the compressor and I got 0.00 volts. I jumped a hot battery directly to the compressor and it locks up and runs the compressor.

Any and all suggestions are appreciated. Guide me please, this one has me pulling my hair out.


(This post was edited by wal1809 on Aug 8, 2020, 2:03 PM)


Hammer Time
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Aug 8, 2020, 2:09 PM

Post #2 of 43 (718 views)
Re: 2005 496 in a coach, dash AC not working Sign In

OK, first thing, STOP unplugging and bypassing things. That's a great way to do a whole lot more damage.

I saw no mention of pressure gauges so if you don't have a set of professional high AND low gauges, and a test light that reads both power and ground then put the tools away and reach for the credit card because this is going nowhere.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



wal1809
User

Aug 8, 2020, 2:25 PM

Post #3 of 43 (714 views)
Re: 2005 496 in a coach, dash AC not working Sign In

I have gauges, it has pressure. I have a volt ohm meter and I have a test light. I do not have a test light that tests ground.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 8, 2020, 2:28 PM

Post #4 of 43 (712 views)
Re: 2005 496 in a coach, dash AC not working Sign In


Quote
I have gauges, it has pressure


You failed to mention that. What are the pressure readings?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



wal1809
User

Aug 8, 2020, 2:57 PM

Post #5 of 43 (705 views)
Re: 2005 496 in a coach, dash AC not working Sign In

At motor idle I have 14 psi on low side and 3 psi on the high side. The compressor clutch is not engaging.


wal1809
User

Aug 8, 2020, 3:05 PM

Post #6 of 43 (703 views)
Re: 2005 496 in a coach, dash AC not working Sign In

In five minutes the low climbed to 20 psi


Hammer Time
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Aug 8, 2020, 3:13 PM

Post #7 of 43 (700 views)
Re: 2005 496 in a coach, dash AC not working Sign In

There is no refrigerant in the system.
You need to have it completely evacuated and recharged with the exact specified weight of charge and we'll go from there.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Aug 8, 2020, 6:07 PM

Post #8 of 43 (685 views)
Re: 2005 496 in a coach, dash AC not working Sign In

Those pressures are just hot air in the system are so low and really wouldn't stay there but equalize. If that happened quickly since it worked last you'd hear the leak with an inert gas you could use to find a total blow out most likely?


I'm totally not familiar with that layout for a motor coach doesn't matter yet find what should be an audible leak.


Same as Hammer Time's warning DO NOT GO JUMPING THINGS there's nothing in a moving machine that isn't some sort of computer controlled by 2005 you'll just cause a wild headache and still have the leak,


Tom


PS: Just averages a clutch's coil if you check for ohms should be about 3-5 but isn't called for even checking that so no need....



wal1809
User

Aug 9, 2020, 11:19 AM

Post #9 of 43 (643 views)
Re: 2005 496 in a coach, dash AC not working Sign In

Apparently the floods got my vacuum pump too. I have to go to the city this evening to buy myself a new pump. In the meantime I put 124a into the system at 53 psi on the low as it is nearing 100 degrees today already. The compressor clutch engages on its own with no jump wires. the low was 53 psi and the high was 30 psi with the engine on, clutch engaged and compressor turning. No odd noise from the compressor.


Tom Greenleaf
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Aug 9, 2020, 11:49 AM

Post #10 of 43 (638 views)
Re: 2005 496 in a coach, dash AC not working Sign In

? Are your gauges any good or did they get all wet (flooded) or something? When you saw if real the super low "static" pressures there was nothing in the system. Adding anything without it holding any vacuum (bet is it wont) could get a compressor to sense enough "static" pressure to fool compressor to try but would quit if this was operable at all.


What possible damage to this thing on top of a flood scene happened to this? Nothing is telling us, hence you much except this never should have really read that low for pressures from the get-go,


Tom



wal1809
User

Aug 9, 2020, 12:14 PM

Post #11 of 43 (634 views)
Re: 2005 496 in a coach, dash AC not working Sign In

I bought new guages yesterday. The pump was in the barn when the floods from Hurricane Harvey whooped our arses. This coach was not flooded, we bought it a week ago.

The only imopfrmation i have/can find is from a tag on the compressor and a tag another tag on the evaporator. The one on the compressor. the tag on the evaporator says 32 oz of 134a


Hammer Time
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Aug 9, 2020, 12:41 PM

Post #12 of 43 (632 views)
Re: 2005 496 in a coach, dash AC not working Sign In

If you pumped refrigerant in to system that had air in it, then you just wasted the refrigerant because air is a non-condensable and will throw the whole system off.

Now, when you get the vacuum pump, you will have to dump the load and vacuum it for at least 30 minutes to dry it out and then recharge it with the proper amount. I suggest you add a couple ounces of PAG oil also.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



wal1809
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Aug 9, 2020, 1:32 PM

Post #13 of 43 (625 views)
Re: 2005 496 in a coach, dash AC not working Sign In

I have family here right now, then headed to get a pump. Stand by for a little while.


wal1809
User

Aug 13, 2020, 4:15 PM

Post #14 of 43 (506 views)
Re: 2005 496 in a coach, dash AC not working Sign In

Alrighty. Got a new pump and a leak sniffer. While the system was still charged I sniffered all I could get to. Found no leaks. I then pulled a vacuum and left it overnight. I got no drop in vacuum. Added 32 oz 134a. Turned the engine on and AC on. I got 100 psi on both the low and high side.


Hammer Time
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Aug 13, 2020, 4:40 PM

Post #15 of 43 (498 views)
Re: 2005 496 in a coach, dash AC not working Sign In

Was the AC clutch engaged when you got those readings?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Aug 13, 2020, 4:48 PM

Post #16 of 43 (494 views)
Re: 2005 496 in a coach, dash AC not working Sign In

How did you get the full 32oz into the thing - just curious now?
With pressure (shouldn't matter what) of 100 the compressor should be engaged, was it? By that I mean the outer hub of about any completely turns not just a pulley action as they act as both whether on/engaged or off just a pulley.
100PSI with a warm engine no doubt is just static pressure like checking a tire. Compressor isn't doing anything for that so need to know what it does if anything.


Sniffers? Tricky biz I like my own and am used to it works then may not find a thing still look for evidence as most would be leaks showing oiliness or a real mess someplace.
Hidden and intermittent can be the comprssor's shaft seal if it was fast maybe no oil behind it. It's possible to seal again by temperature or pressure but not at certain times is tight like you found it held a vacuum.


Vacuum is only holding out the PSI of the atmosphere not 350PSI possible of refrigerant gas so just because that holds isn't for sure yet. BTW the pressure is close to 14.7PSI we live in just note that's all vacuum is holding OUT from getting inside.


Keep looking and sniffing do just check the sniffer with just a cap taken off and a finger over it should set off your sniffer away from this thing if it works worth a damn.


I couldn't speak for all types of tools know my own well there are assorted things all different so can't know all sniffers you test it and set how sensitive if no such thing it's too cheap to be worth anything??


Tom



wal1809
User

Aug 13, 2020, 4:48 PM

Post #17 of 43 (494 views)
Re: 2005 496 in a coach, dash AC not working Sign In

Yes. The compressor was engaged.


Hammer Time
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Aug 13, 2020, 4:53 PM

Post #18 of 43 (488 views)
Re: 2005 496 in a coach, dash AC not working Sign In

If you're sure about that and you had the valves closed on the gauges, then the compressor is junk.

That will mean replacing the compressor, condenser and expansion valve/orifice tube.

Once all that is done and you get the system up and running, then you need to look for what caused the compressor to fail in the first place.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



wal1809
User

Aug 13, 2020, 4:55 PM

Post #19 of 43 (484 views)
Re: 2005 496 in a coach, dash AC not working Sign In

I am positive the clutch was turning the compressor. Before I answered, I went back and double checked.

I am confused a bit. I had the valves open on my gauges to read the pressures.


Hammer Time
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Hammer Time profile image

Aug 13, 2020, 5:02 PM

Post #20 of 43 (472 views)
Re: 2005 496 in a coach, dash AC not working Sign In

OH, there's your problem. That just runs the high and low side together. The gauges read with the valves close. The valves are for letting refrigerant in or out of the system.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 13, 2020, 5:04 PM

Post #21 of 43 (469 views)
Re: 2005 496 in a coach, dash AC not working Sign In

? OK my gauges are dated I guess but now just two sets each shuts off at the ends and again at the manifold. OMG, I couldn't guess how many different types there could be but they both work and are accurate.
Other is bad connections not all Acme ports are happy with assorted gauges may need to push down but be careful if on a line not to bust it in the course of checking if gauges work? Some new are a pest so I/we fuss with some or use another set one is right angle another is straight on can matter or has to me.


Keep trying the inside hub has to turn or we aren't checking anything yet,


Tom



wal1809
User

Aug 13, 2020, 5:13 PM

Post #22 of 43 (462 views)
Re: 2005 496 in a coach, dash AC not working Sign In

I am 1000% positive the clutch engaged with the compressor. The pulley and the center hub are all turning.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 13, 2020, 6:00 PM

Post #23 of 43 (455 views)
Re: 2005 496 in a coach, dash AC not working Sign In

Just shut the damn valves off and then read the pressures with the AC on. Stop making this more complicated than it is.

Make sure we are both talking about the same valves. I'm talking about the valves at the gauges, not at the coupler.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Aug 13, 2020, 6:17 PM)


wal1809
User

Aug 14, 2020, 6:42 AM

Post #24 of 43 (414 views)
Re: 2005 496 in a coach, dash AC not working Sign In


In Reply To
Just shut the damn valves off and then read the pressures with the AC on. Stop making this more complicated than it is.

Make sure we are both talking about the same valves. I'm talking about the valves at the gauges, not at the coupler.



Ok with the engine on, compressor turning and the valves at the
Gauges in the off position I get 85 psi on the low side and 195 psi on the high side.


(This post was edited by wal1809 on Aug 14, 2020, 6:49 AM)


Hammer Time
Ultimate Carjunky / Moderator
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Aug 14, 2020, 6:58 AM

Post #25 of 43 (400 views)
Re: 2005 496 in a coach, dash AC not working Sign In

OK, that still indicates a weak/bad compressor.

You're not going to get cold air with those pressures.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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