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Hissing noise while adding freon - Cars & Trucks

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Only fairly loud hiss,would be you leaking
refrigerant out of your hose set, up into the air.
A slight hiss internal to the system, would only
be next to the orifice screen or txv valve,as it boils
off to a gas into the evaporator.

Posted on Jul 16, 2013

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Hissing sound right after i turn the ignition on like air escaping from somewhere. it started right after I added freon to my ac. What could this be?


It's possible that there is a leak somewhere in the AC system and when you turn the car on the high pressure in the lines pushes some of the freon out. Normally you don't need to add freon so my guess is you have a small leak somewhere.

Aug 06, 2013 | 2006 Lincoln Town Car

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I put new dryer and compressor on 04 gmc truck I charged sys and shut motor off about 2 minutes I heard a hissing noise coming from fire wall do I have a leak in evaporator or does it have a pressure valve...


Neither.
You were probably hearing the freon gas equalizing in the system.
When you add freon it is generally in liquid form. And it can settle in the bottom of the condenser and evaporator. Once the system is full and has been cycled a few times, it should not make much of a noise. You may want to check it in a day or two and make sure it is full. High side should read around 200-250 psi. at idle.

Jul 13, 2013 | Cars & Trucks

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1996 Buick Park Avenue Ultra making a hissing noise when I press Brake Pedal. Have to Press super hard to stop or slow down.


Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

Jul 10, 2013 | Cars & Trucks

2 Answers

AC NOT WORKING PROPERLY


You've got some of the picture, but not all of it.
You need to know what the high and low side readings are, so yes you do need the gauge set. If the system is charged, and the low side is not dropping below 25psi, I would guess the low side pressure switch is faulty. But if the low side is dropping below 20psi when the compressor stops, the system may be low on freon. Which means you have a leak somewhere.
The hissing noise is freon flowing thru the system which could also indicate a low charge.

Apr 22, 2013 | 2009 Buick Enclave

1 Answer

99 Dodge Grande Caravan the A/C blows hot air and a hissing sound under dash


Well the hissing sound could be a vac leak or the freon flowing thru the system.
Someone needs to check the freon charge in the system with a gauge and the electrical circuit to the compressor clutch.

Sep 03, 2012 | 1999 Dodge Grand Caravan

1 Answer

A hissing noise in front when car is turn off?


Try leaving the A/C off and then drive a few miles and park the car. Sometimes the Freon in the A/C coil will make noise until the car has time to stabilize the Freon pressure. If you eliminate the A/C for testing, you can move on to considering another possible problem.

Jul 17, 2012 | 2008 Chevrolet Cobalt

1 Answer

I have a Montero Sport 2003, last week I had Freon added to be prepared for the summer, I noticed a noise and ask the mechanic, he said it was the fan but nothing to worry about. I drove the Montero for 2...


If the noise started after you added the Freon, then it perhaps is your AC clutch. Normally if you have an automatic AC system, then when the Freon gets low, the auto system will not allow the AC to engage, only allowing the fan to circulate outside air. In order to add Freon to the system, the AC lock out has to be over ridden, in order for the compressor to **** in the Freon. This in turn engages the AC system so that the clutch engages, thus engages your AC system. The clutch bearings may be at fault.

Mar 22, 2011 | 2003 Mitsubishi Montero Sport

1 Answer

My air condishing quit working. It appears that the freon leaked out. You could hear a hissing sound under the dash. Is there something that can come lose under there and how do you get to it. It is a 2000...


probably the evaporator leaking the noise may be just the freon going through the system, you have to remove the entire dash to access the hvac box to remove it to replace the evap seek a professional

Jul 16, 2010 | 2000 Chrysler Grand Voyager

1 Answer

1999 Chevy Suburban - My rear air vents had COLD a/c coming out but my front vents had Cool/Warmer air coming out. I added a can of freon and now it needs more. I can hear a hissing sound near the joint...


The hissing is caused by the freon going through the orifice tube, so do not touch the 2 nuts. You will loose the freon in the system.

What's probably going on is the mode actuator is not functioning correctly.

Take it to a professional, a dealership should be able to help you.

Aug 12, 2009 | 1999 GMC Suburban

3 Answers

Air conditioner not blowing cold after recharge last year


david_simko: based on your description above, it definitely sounds like you have a leak somewhere in your A/C system. If you re-charged your A/C system last year, you should still have plenty of freon (R134-a) coolant in your A/C system. If you are familiar with how the A/C system works on your vehicle, there are two products you can use to help you identify leak in your A/C system. The first is a liquid that you inject into the system. This liquid will come out (in a solid color) in the area(s) of where the leak is accruing. The second device is a electronic freon sniffer. This is a small hand held device with about a 10" antenna on it. This device electronically "sniffs" for freon, and leads you to the area of where freon is leaking. Since you've stated that you re-charged your A/C system last year, and since has degraded from cold air, to warm and now hot air, you will have to (at minimum) partially recharge your A/C system to use one of the two leak detection methods I have mentioned above. PLEASE VOTE FOR THIS REPLY IF YOU HAVE FOUND THIS INFORMATION HELPFUL. Thank you.

Jun 03, 2009 | 2000 Plymouth Grand Voyager

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