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2nd Generation
Automotive HVAC Experts - Come On In!
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<blockquote data-quote="L-Bronco" data-source="post: 16724905" data-attributes="member: 203053"><p>I realize hat this thread is 5 months old, but, better late than never!</p><p>The temporary hissing sound from your A/C is most likely the pressures equalizing between the low and high sides after you shut it off. (That's why it stops after a few seconds) Its hard to be certain without seeing it.</p><p>As far as the hose goes, (Not sure if you replaced it or not), if not, just spay a dish soap and water solution on the suspect area on a hot day before you start the truck and look for bubbles. (The pressure the system follows the temp, so hot day = higher pressure and better test results) </p><p>On that note, the pressure being lower after it stopped hissing is quite normal as well because the low side of the system (In the dash) is cold and the average pressure on the gauges will drop a bit.</p><p>Hope that helps.</p></blockquote><p></p>
[QUOTE="L-Bronco, post: 16724905, member: 203053"] I realize hat this thread is 5 months old, but, better late than never! The temporary hissing sound from your A/C is most likely the pressures equalizing between the low and high sides after you shut it off. (That's why it stops after a few seconds) Its hard to be certain without seeing it. As far as the hose goes, (Not sure if you replaced it or not), if not, just spay a dish soap and water solution on the suspect area on a hot day before you start the truck and look for bubbles. (The pressure the system follows the temp, so hot day = higher pressure and better test results) On that note, the pressure being lower after it stopped hissing is quite normal as well because the low side of the system (In the dash) is cold and the average pressure on the gauges will drop a bit. Hope that helps. [/QUOTE]
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