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Registered
1999 Eldorado
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101 Posts
Discussion Starter #1
I'm getting the message across the dash on a '99 Eldorado.
The charge in the system is perfect though. Which sensor/switch am I looking
to change ? And I wonder if disconnecting the battery for a few minutes would solve it ?

Any and all help is appreciated,
Mark
 

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Registered
2007 EXT Supercharged
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1,510 Posts
explain the perfect charge you have?

There would be a switch usually on the dryer, but could be anywhere on the lines, obviously have wiring going to it....dead give away.

I know they are there.......just not how many and which sensor to replace.....but.....you would need to evac it.....so id try to rule out a sensor replacement unless you want to recharge it.

Clear the codes to get the ac working again, and if you get the message again it will more than likely shut down the compressor again.....i doubt the sensor is bad but you never know. Either way you have to recharge it.
 

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1999 Eldorado
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101 Posts
Discussion Starter #3
cl1986,

What I meant is that I put the gauges on it and there is enough freon in the system. I'm going to go out after work and try the ole' paper clip across the terminals of 2 switches I can see, and see if the compressor kicks on....
I hate having to evac. the system ....:rolleyes:


Disconnecting the battery will hopefully clear the message on the dash...

Time will tell :hmm:
 

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Super Moderator
2010 DTS
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87,543 Posts
Disconnecting the battery will clear the codes, but so will entering the onboard diagnostics and clearing them from there. What where your high and low side pressures and what was the outside temperature when you checked it?
 

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69 Thunderbird | 90 Seville | 03 Corolla | 89 Marquis(scrapped) | 72 Torino(scrapped)
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2,026 Posts
You can have a 'low refrigerant' message and still have adequate pressure. If the system had a leak that was fixed and then was recharged without an evac then most of that pressure will consist of air. -That is the case in my vehicle. A fitting came loose on the previous owner allowing the charge to escape and the ambient air to enter the lines. The system was recharged with a home DIY kit and the pressure is good but it cools for 5-10min and then I get the message.
 

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Registered
1999 Eldorado
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101 Posts
Discussion Starter #6
Sevillian 273,

It looks like you hit the nail on the head. I disconnected the battery for a few minutes and reconnected. The compressor started to cycle, but the duct
temperature never went below 80*....It's off to the shope to be evacuated properly...

TTT

Thanks guys...:yup:
 

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2007 EXT Supercharged
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1,510 Posts
eeehhh...i forgot to look in the FSC but anyone know what pressures for the high and low side....i just added some to mine this weekend but i was at the shop and my FSC was at home...

Im thinking im low yet as i only got to 210 on the high side.
 

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Super Moderator
2010 DTS
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87,543 Posts
The pressures vary with temperature. Generally speaking low side will be 27-30. High side between 2.2 and 2.5 times ambient temperature. This is for R134a.
 
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