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I have a confusing a/c problem


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larrys2006
New User

Aug 3, 2020, 7:55 PM

Post #1 of 7 (323 views)
I have a confusing a/c problem Sign In

This is how the story goes I have a 2004 grand marquis, it has a eatc controller for the temp. I replaced the acumulator sucked down the system then put in two cans of freon then it started to rain and like a idiot I left the gauges hooked to the high and low side over night and the next day they read 0 pounds and their was no oil around any fittings and for some reason I do not know why still I started the car jumped the low pressure sender on the acumulator and the clutch would not go on. I measured 13 volts at the low side connector with a vom because the clutch did not come on when I jumped it. I went to the high sensor and pulled the connector but only found 5 v ref no 13v all fuses are good the diode is good. I went to the clutch relay and swapped it nothing, I have 13 v at the contact point of the socket and jumped it like the relay would and the clutch went on. I measured 13v at the relay coil using the coil neg to coil pos but when when I hooked up a led test light across the points it barely lit! so the relay would of never of been able to close. What do I do now?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 4, 2020, 1:31 AM

Post #2 of 7 (305 views)
Re: I have a confusing a/c problem Sign In

Oh my Larry? Let's start over with this and put the jumping wires and VOM or DVOM away for later if not already that's the new problem.
Why did you replace the accumulator? If so how much oil came out of it if you heated it and drilled a hole in it? You would put that much back and an ounce and call that done.
Now see if it holds a vacuum a half hour is enough? Just into the vacuum you'd get a whole 12oz can in without engine running or jumping anything high risk escspecially if more than a two wire LPCO.


That's enough pressure to finish this easy car is 38oz 134a X 3 cans is 36oz add the other 2 later but you were interrupted so start all over.
Don't leave gauges on the car perhaps still with a can attached understand the emergency it's going to leak by all odds and you don't want all you stuff wet if nice gauges even IDK if they'd take that?


Please quit electrical crap unless that was the issue up front and first you are playing with ruining this it is highly computer controlled/organized what to do choose the right temps, weather (as if you/we can) or place to work with essentially you listed raw basic equipment or place to do this delay doing it at all.


Just start over in short and hope it will just kick back to work from adequate static pressure but it must be an honest 80F or more or delay the charge up,


Tom



larrys2006
New User

Aug 4, 2020, 1:37 PM

Post #3 of 7 (287 views)
Re: I have a confusing a/c problem Sign In

the accumulator was leaking green and it was the original. the gauges are jb 4 valve zeppelin very old off ebay had a broken high gauge I replaced with new lines. It is raining from that east coast storm now I will have to wait. the oil was about 2 1/2 oz yellow.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 4, 2020, 2:18 PM

Post #4 of 7 (281 views)
Re: I have a confusing a/c problem Sign In

OK: This storm over my head too right this minute now passing understood no time to mess with this.


You got that much oil out so how much did you put back? That alone isn't the issue YET just OE oil sometimes comes with color to see this is one of them.


It too despite being simple doesn't want YOU jumping things so if nothing blew to default to compressor OFF reset it - try just a battery negative disconnect and leave it off - sorry about losing info in toys it probably will idle lousy for a while too - a risk to take unless you send it out now for serious diagnosis of blown controls from being jumped!


Too late you did and knew it was just a leak and fixed it didn't have to force a thing on one of these it happened so hope to get lucky with battery disconnect. In fact turn on headlights manually while battery is disconnected to really drain out info faster or wait a couple hours just know it would reset if resettable for this. Wish you luck the cost of saving a buck can be NASTY for A/C beware hope not the hard way,


Tom



larrys2006
New User

Aug 4, 2020, 3:42 PM

Post #5 of 7 (273 views)
Re: I have a confusing a/c problem Sign In

sorry I also for got to say I hooked up my autel 9600bt and it said I had a po 645 and when I went to the fan section for interactive test I think it is called it said the modual was not available and autel tec support does not like to answer questions the bastards half the time.


larrys2006
New User

Aug 4, 2020, 3:44 PM

Post #6 of 7 (271 views)
Re: I have a confusing a/c problem Sign In

3 oz


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 4, 2020, 4:44 PM

Post #7 of 7 (266 views)
Re: I have a confusing a/c problem Sign In

That code could very well be related to your problem.
The P0645 is related to the Wide Open Throttle AC cutout. This is a feature that shuts down the AC at wide open throttle and if the PCM is seeing wide open throttle all the time it will not all the compressor to engage.

You also have to make sure the AC was off during the code test as that can give you a false code.



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