Weird Noise, AC and now Check Engine Light is on

XTOSSIN

MEMBER
2007 VOLVO S40
56,000 MILES

Hi.

My Volvo Started making a VROOM sound upon acceleration, then I noticed the AC was not blowing cold air. Then Check Engine Light Came on!

Since it was Sunday, I went to Firestone to diagnose it. The mechanic refused to repair it, but gave me some ECM error codes his computer read:

1300- Mass Air Flow Sensor
400- canister Purge Valve
4310- leakage Detected
4350-Leakage detected Heater
6000- AC relay
6400- Cam Shaft Reset

The mechanic said it could be one thing that sets all these codes off. But he has no clue how to fix this.

He suggested I go to a Volvo Specialist, which I do plan on going.

Regardless, I'm eager to go educated to the specialist, any ideas what may be going on, if its something I can do myself? I am pretty handy on DIY work!

Thanks in advance

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

I have seen were the fan clutch lockup to make that noise. It could be bad, or the engine is overheating causing the problem. As far as the codes go, I would clear them all and let the system reset to recheck the problem. Could be just a glitch.

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Sunday, September 8th, 2013 AT 8:04 PM

XTOSSIN

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4 POSTS

Thanks for the reply!

I got this car from Beverly Hills BMW, They claimed they had changed the oil and oil filter. I went on driving the car for about 47 months before it started doing this.

Turns out the oil filter was never changed, it's not a conventional oil filter, so somehow the oil leaked in the Oil Housing Unit shorting out the A/C.

Once the oil housing unit was replaced, added new filter and oil. Everything stated working fine!

Funny how I got a total of 12 error codes due to one component, once one was fixed they all went away!

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Monday, September 9th, 2013 AT 1:05 AM

KEN L

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47,643 POSTS

That's one for the books, change the oil and trouble code and ac starts working, learn something new everyday :-) glad to see the car is fixed.

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Monday, September 9th, 2013 AT 8:26 AM

XTOSSIN

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4 POSTS

Hey Ken,

Not the Oil itself. The entire Oil Housing Unit had to be replaced!

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Monday, September 9th, 2013 AT 11:02 AM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Okay, wow that is quite a replacement part. Did they say what went wrong exactly besides leaking oil? This is a great question and answer for our readers, you will help many people with this one :-)

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Monday, September 9th, 2013 AT 11:17 AM

XTOSSIN

MEMBER
4 POSTS

Because the Oil Filter was very old, it had gathered gunk, and the oil filter leaked out and shorted those two connectors shown in the attached picture.

The shorting was blowing the A/C fuses, eventually the Windows would NOT go up or down. Making it a SAUNA in the middle of the summer!

The oil at this point had gone very low, the car was making a growling sound and was trembling. It almost turned off on me at a stop light.

Having told that "tiny" detail that the car almost turned off on me at the stop light was what made the technician check the Oil Housing Unit and found the problem.

What the Technician saw was that the fuses were just getting blown, one after the other. Thus making him think it was some electrical issue and possibly had to open the entire dashboard and start digging to find what was blowing it. That was until I remembered that the car almost turned off on me at the stop light!

Thanks

CHECK attached image

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