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The Unexpected Climate Control Vacuum Leak in our Volvo 240
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It only leaks until it doesn't...
Ever since we revived our Volvo 240/244 I've noticed a massive "hissing" vacuum leak coming from somewhere behind the dash.
Here's the link if you want to see the first start!
This hissing/sucking sound happens when selecting floor, defrost and recirculate modes - but its loudest when defrosting. I decided to go on a mission to find out what was actually leaking.
As an armchair mechanic myself - the most common issue people online report was a leaking HVAC check valve located on the intake manifold. While I don't believe ours is faulty, it looks awful and has some very small cracks forming. I took this time to install a Bosch replacement check valve and replace all the 3mm and 10mm vacuum lines with silicone tubing.
Not-shockingly... Nothing changed. So I dismantled the center console and started tracking down the issue. After digging around back there I found that the defrost diaphragm/actuator had come unplugged. I've seen this before unfortunately - after an aftermarket car stereo is installed - someone accidentally unplugs something or rips out a climate control vacuum line while pulling extra slack on a harness. Once plugged back in - everything is ready to go!
Hope this helps some of you guys and gals figure out your leaks!
Ever since we revived our Volvo 240/244 I've noticed a massive "hissing" vacuum leak coming from somewhere behind the dash.
Here's the link if you want to see the first start!
This hissing/sucking sound happens when selecting floor, defrost and recirculate modes - but its loudest when defrosting. I decided to go on a mission to find out what was actually leaking.
As an armchair mechanic myself - the most common issue people online report was a leaking HVAC check valve located on the intake manifold. While I don't believe ours is faulty, it looks awful and has some very small cracks forming. I took this time to install a Bosch replacement check valve and replace all the 3mm and 10mm vacuum lines with silicone tubing.
Not-shockingly... Nothing changed. So I dismantled the center console and started tracking down the issue. After digging around back there I found that the defrost diaphragm/actuator had come unplugged. I've seen this before unfortunately - after an aftermarket car stereo is installed - someone accidentally unplugs something or rips out a climate control vacuum line while pulling extra slack on a harness. Once plugged back in - everything is ready to go!
Hope this helps some of you guys and gals figure out your leaks!
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