Hissing noise near coolant reservoir after shutting car off?

[iboughtatahoe23]

It was hot out today and I was running errands and the car was hissing near this area when I shit the car off and opened the hood. The coolant gauge reads normal all day no overheating to my knowledge

 

[iboughtatahoe23]

It’s just a “ssssss” noise that goes away after shutting car off. Is it just excessive pressure being vented?

Edit: 89° f out but no overheating.

 

[iboughtatahoe23]

Update. Seems to be coming from condenser area. I used A/C pro and might have over charged it. It still blows cold though. In reference to the hissing noise.

 

[j91z28d1]

it's pretty normal for ac to sound like that.. it's just equalizing from the high pressure side to the low pressure side after the pump stops.

 

[iboughtatahoe23]

it's pretty normal for ac to sound like that.. it's just equalizing from the high pressure side to the low pressure side after the pump stops.

Ok. Appreciate the quick feedback man. Thanks.

 

[iboughtatahoe23]

Ok. Appreciate the quick feedback man. Thanks.

So would it make it worse if I overcharged it on accident? I was watching the gauge on top of the ac pro can, but it seems to fluctuate when the compressor clutch kicks on and off. When on it would go down and when off it would go into the red or yellow, So never got the right reading. I’m assuming I am supposed to read it when the compressor is on.

 

[iboughtatahoe23]

Someone told me “Most likely your radiator they get pressure bulit up while running”
And then said this is not normal.

I said it was the pump like you had mentioned and then they said “ The compressor wouldn't stop after 10 sec it would go until your entire ac is drained. And no it's not normal”

 

[j91z28d1]

is your ac cycling at idle? what's the outside temp? usually if it's hot out it won't cycle much if at all at idle.

I've not heard of a radiator building up pressure and needing to release without seeing steam and smelling coolent.

if it's not over heating I wouldn't worry about it but what's the back story on the ac.

 

[OR VietVet]

That noise IS the a/c pressure equalizing after shut down. Noise used to be at the accumulator because that is where the orifice was on older vehicles and now the orifice is where you hear the noise. If you are not running hot and a/c is cold, it is ok. By the way, how do you...."shit the car off"....?

That is gonna leave a mess........