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What causes an evaporator core to leak? #5386495 03/26/20 07:26 PM
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atikovi Offline OP
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Not like it's in front of the car so it can get punctured by a rock. Made of aluminum and located inside the car so won't rust. Are late model Subarus known for leaking evaporators? Pretty much diagnosed it as the source of the leak in my '16. It was blowing cold last fall but nothing now. Compressor engages but low pressure on the test gauges. Recharged and air is ice cold. Used an electronic leak tester and got nothing along the lines under the hood, but as soon as put it to a dash vent, it goes off.

Re: What causes an evaporator core to leak? [Re: atikovi] #5386503 03/26/20 07:34 PM
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Chris142 Offline
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If you have the fan on your sniffer will go off if the air is blowing across it. Try blowing into your sniffer to see for your self

Evaps can fail from just bad quality, acids in the system from not vacuuming it or filling it from a can. The most common is debris in the case that stay wet and corrode the evap.


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Re: What causes an evaporator core to leak? [Re: atikovi] #5386504 03/26/20 07:37 PM
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irad Offline
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Aluminum(Al) can get galvanic corrosion. If Al comes in contact with copper or zinc Al acts as the sacrificial metal. It can also occur when frost on the fins melts and there are salts in the air, like at the beach.

Re: What causes an evaporator core to leak? [Re: Chris142] #5386513 03/26/20 07:47 PM
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atikovi Offline OP
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Originally Posted by Chris142
If you have the fan on your sniffer will go off if the air is blowing across it. Try blowing into your sniffer to see for your self


No, it was with the a/c off.

Re: What causes an evaporator core to leak? [Re: atikovi] #5386530 03/26/20 08:01 PM
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zzyzzx Offline
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You are wondering why something made in China had failed???

Re: What causes an evaporator core to leak? [Re: atikovi] #5386533 03/26/20 08:03 PM
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atikovi Offline OP
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How would you know it was made in China?

Re: What causes an evaporator core to leak? [Re: atikovi] #5386536 03/26/20 08:05 PM
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dishdude Online Content
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Usually the passenger side floor vent is the best to use the sniffer on, typically it's closest to the heater box.


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Re: What causes an evaporator core to leak? [Re: dishdude] #5386543 03/26/20 08:08 PM
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atikovi Offline OP
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Originally Posted by dishdude
Usually the passenger side floor vent is the best to use the sniffer on, typically it's closest to the heater box.


The floor vent doesn't get any air conditioned air.

Re: What causes an evaporator core to leak? [Re: atikovi] #5386580 03/26/20 08:33 PM
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nwjones18 Offline
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I stick the sniffer in the drain tube to test for them. I had to replace the one in my wifes 2008 CRV. I don't know why they fail, but everything does eventually..


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Re: What causes an evaporator core to leak? [Re: atikovi] #5386598 03/26/20 09:04 PM
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2009Edge Offline
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Usually its a HOLE crzy

Re: What causes an evaporator core to leak? [Re: atikovi] #5386599 03/26/20 09:04 PM
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stevejones Offline
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My guess would be metal fatigue after xxx number of contractions/expansions....

Re: What causes an evaporator core to leak? [Re: atikovi] #5386601 03/26/20 09:05 PM
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2009Edge Offline
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Usually its a HOLE crzy

Re: What causes an evaporator core to leak? [Re: atikovi] #5386676 03/26/20 11:35 PM
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14Accent Offline
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Don't be surprised, you aren't alone. I've seen many 2010-2014 Subaru's with Evap core leaks. Why? I couldn't tell you. What I can tell you is that it's relatively easy to replace, does NOT require dash removal, and can be done with hand tools in a driveway in an afternoon. Just pay a shop to evacuate and recharge the system, and you'll be all set.


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Re: What causes an evaporator core to leak? [Re: atikovi] #5386687 03/27/20 12:28 AM
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Many BMW E90s had evaporators that leaked from new. Imagine having this fixed on a nearly new car. It’s an UGLY job! Instead, I get mine recharged every 2 years.

https://www.youtube.com/watch?v=IYVBcn4LB7I&feature=emb_title

Scott


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Re: What causes an evaporator core to leak? [Re: atikovi] #5386720 03/27/20 03:55 AM
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Incorrect coolant, neglected coolant or inferior/weak part.

Often it is due to coolant wearing out over time and becoming acidic which corrodes aluminum.

How often do you change your coolant and what coolant do you use?

If you can get your hands on a pH stick and check the pH of the coolant you could see if the pH is below 7.


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