Question about 1998 Cadillac DeVille

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Massage said low ref ac off what dose that mean thanks

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That means low refrigerant available and the low pressure switch is preventing the compressor from damaging itself. You will need freon added to the system which in not uncommon since mobile a/c systems normally leak a small amount each year and eventually need topped off to work properly. Either buy some freon from a parts store or find an independant repair shop that will agree to just add the freon necessay to make the system work again. Freon necessary on most systems ranges from 1 to 2 pounds and freon bought in bulk by all shops costs $3 a pound and labor to do this is about a half hour so look at their labor rate and add a reasonable profit for the freon and this is what it should cost. If this helps please reply cause that helps me and good luck

Posted on Apr 29, 2010

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Dose this mean computer die?wont start new fuelpump so where do i go from here ? new computer or what


Take it to a ASE certified repair facility ,they'll fix it up ! Don't just replace parts !!!!!

P0171 - is a lean code bank 1 -possible vacuum leak , low fuel pressure , plugged fuel filter ,
P0300 - is a random misfire code which is understandable with a lean code .
P0420 As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first
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If you don't know what your doing take it to a repair shop before you waste your money ! You have a lot of problems here an I don't think the computer is bad , I'd say lack of maintenance ! You need to learn how to test thing's to fix them ! From the five volt reference voltage code , I'd say one of your sensors is shorted internally bring down the ref. voltage circuit causing the no start, but then again the 5volt ref. circuit in the PCM could be the problem . What you need to do is Disconnect all sensors that receive 5volt ref. signal one at a time an see if it will start . If I knew what year vehicle yours is I could tell you what sensors ! MAP, TPS , etc...










Jul 06, 2015 | Oldsmobile Silhouette Cars & Trucks

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My ac clutch comes on for a second then goes off again. The guage on the freon can reads low when the clutch is off then jumps to ful when clutch come on, Any Help?


if it dose turns on for a second than turns off when you have the ac turned on max you could be low on freon. if you are not sure if it is full or not you may want to take your car to someone and have them test the system.

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This is almost always caused by a low refrigerant level in the system due to a leak. Have an AC repair shop hook up a set of AC pressure gauges and check the system pressures to confirm this guess.

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If you get a response to this let me know.. I think Im having the same problem. was told at the shop that te main computer was not communicating with the gear computer. fbonterre@sbcglobal.net

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1 Answer

The ac in my moms car is blowing out air but it comes out hot. dose that mean it needs freon? if so where can i buy some?


The bigger question is how did it lose the Freon to begin with. You can get R-134a at most parts stores and the fitting on the refill cans will only fit on the low side but if you don't fix the leak it will just go low again. try auto Zone for a refill or booster can if you are looking for that.

Oct 06, 2009 | 2001 Chevrolet Blazer

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