How should you properly check for leaks in an auto ac system?

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Can anyone walk me through the steps to re-installing and in-line fuel filter for a 1998 saturn sl1?

The amount of equipment required to properly test it is very expensive. You require an a/c machine with a vacuum pump, UV dye and a freon "sniffer". It would be best to take it to a shop with all this and a tech to do it.

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The only way, is to hire an AC tech. Honestly.

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You can't do it yourself - they hook up special equipment to the low and high pressure sides of the system - add a dye and then use a special light to see if and where the dye leaks out....
No not try it yourself - the high pressure side could really hurst you or the car

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Get some soap and water. Mix them together to make it all sudsy and bubbly. I use a mix of liquid bath soap and water, then use a sponge to make it all sudsy and bubbly.

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With the AC running, using the sponge put the suds on A/C lines and watch for the bubbles to build. The leak should present itself as blowing bubbles.

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You can do it yourself. Don't listen to these other bozos. Get a book on it, and buy the guages at your autoparts store. It's not that hard. Autozone sells an AC repair/service guide that will walk you through the steps. It is too extensive to list here.

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Turn the system on and spray with a soap/water solution. Any leaks will cause bubbles.

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If your auto ac is leaking coolant it's time for a new car. I've never had success with any make of car when it comes to fixing the A/C system.

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I've had multiple mechanics tell me it's a waste of money to try and fix the A/C.

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A proper check can only be done in a shop. They can locate any leaks in the A/C system, including those in the coil under the dash. If you want to just do a quick check for the hoses under the hood only, carefully spray on a soapy water solution making sure that the alternator does not get wet. To make any repairs to the system you'll need to invest in a manual and a guage set as a minimum. The manual will mention any other additional tools needed.
If your car is from the R-12 days you are best off getting an R-134 retrofit kit because you can't purchase R-12 without a license and even then it goes for about $100 per pound, IF it is still available.
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