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I bought refrigerant and had this guage. Tried it but when I first hooked it up it registered in the red at around 140 psi with the trigger out. When I push the trigger in it goes to green which is "low coolant" and after holding it there for a minute the needle didn't go anywhere. I know that the ac works I can hear it kick in but now that the hot weather is here there's no cool air . I'm afraid of that 140 psi and don't want to have anything happen. Am I supposed to just ignore that and worry about the green section or what?
First, I'm going to fix the title. It's refrigerant, not coolant.
Second, 140 psi is wayyyy too much. It is significantly overfilled.
You always fill from the low pressure side. The ports are different sizes so you can't get them mixed up. That can surely connects to the low pressure side. With the car not running and after sitting for a while, both high and low pressure sides should be the same. Roughly at ambient temperature. So if it's 80F out, both should be around 80 psi. With the engine running, the low side should drop to ~40 psi and high side should go up to ~180 psi.
First, I'm going to fix the title. It's refrigerant, not coolant.
Second, 140 psi is wayyyy too much. It is significantly overfilled.
You always fill from the low pressure side. The ports are different sizes so you can't get them mixed up. That can surely connects to the low pressure side. With the car not running and after sitting for a while, both high and low pressure sides should be the same. Roughly at ambient temperature. So if it's 80F out, both should be around 80 psi. With the engine running, the low side should drop to ~40 psi and high side should go up to ~180 psi.
When the trigger is squeezed it reads low or green it should go to blue according to my guage. With the trigger out it reads 140psi not when squeezed.
When the trigger is squeezed it reads low or green it should go to blue according to my guage. With the trigger out it reads 140psi not when squeezed.
I can't explain that but 140 psi is way too much. Low side should never see more than ~80 psi, and that's with the engine off. It should be in the blue are with the compressor running. Maybe the gauge is not functioning properly.
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re: Tried adding refrigerant but no fill [solved]
If you're going to mess with ac (which most people shouldn't) you need to buy a proper set of manifold gauges. They're pretty cheap on amazon. Or let a shop deal with it
I can't explain that but 140 psi is way too much. Low side should never see more than ~80 psi, and that's with the engine off. It should be in the blue are with the compressor running. Maybe the gauge is not functioning properly.
Where is the low pressure switch that tells the compressor not to engage in a2005 civic? If someone could send me an image of it. I saw several videos that show why refrigerant won't fill the system and it's because the computer tells the compressor to cycle on and off when low on refrigerant or the compressor doesn't engage at all.
If you're going to mess with ac (which most people shouldn't) you need to buy a proper set of manifold gauges. They're pretty cheap on amazon. Or let a shop deal with it
I had the wrong charging hose . I got things to work. I bought a large bottle of refrigerant for my Corolla way back in 2008 when the didn't have self sealing bottles or cans. I bought a 12voz. can of self sealing refrigerant and tried to make the old guage work on it but it didn't. It still tells me that I have 45 psi or "filled" on the old guage. My new can of refrigerant doesn't have a guage(went cheap). But everything works so thanks
I can't explain that but 140 psi is way too much. Low side should never see more than ~80 psi, and that's with the engine off. It should be in the blue are with the compressor running. Maybe the gauge is not functioning properly.
I had the wrong charging hose . I got things to work. I bought a large bottle of refrigerant for my Corolla way back in 2008 when the didn't have self sealing bottles or cans. I bought a 12voz. can of self sealing refrigerant and tried to make the old guage work on it but it didn't. It still tells me that I have 45 psi or "filled" on the old guage. My new can of refrigerant doesn't have a guage(went cheap). But everything works so thanks
