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post #6 of 9 (permalink) Old 13th August 2007
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Good thinking Noel

Craig, Kwik Fit do a free exhaust check - an easy way to get a look under the car yourself aswell .

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post #7 of 9 (permalink) Old 13th August 2007
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Could be a noisy fuel pump?.Does it stop when you turn the car off?

Can you hear the noise inside the car?

If you switch the ignition on,does it make the noise,then stop?

I'd rather push my Alfa than drive a BMW....
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post #8 of 9 (permalink) Old 14th August 2007 Thread Starter
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thank's again for all the replies guy's. Yes Noel the car has aircon, but is the condenser not in the engine bay. Although i can't pinpoint the noise, it sounds as though i'ts coming from the middle of the car. The best match for the noise i can think of is, when you get a burst of air from a compressor. I don't think it sounds like a fluid hitting something hot! If it was something adrift in the exhaust would there not be a rattle to accompany it?
Hi lagdti, does the fuel pump not come on when you turn on the ignition. It does'nt make the noise until you fire it up. And no i cant hear it inside the car. Thats probably why i did'nt hear it on the test drive. It does'nt seem to be affecting performance or anything, but i just thought i'd see if anyone has experienced the same. It's going in to get the headlight washers fixed so i'll get them to check it while it's in.
Thank's again
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post #9 of 9 (permalink) Old 14th August 2007
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Hi Craigie - the condensor is behind the radiator grill and close to the radiator but the evaporator is situated inside the heater unit inside the car which has a drainhole to the underside of the car. Condensors don't generate moisture but evaporators do. An air-con system wprks on the same principle as a fridge and disipates heat whereas the condensor is at the back of the fridge but the evaporator is inside - and guess what the water on it tends to freeze up simply because it doesn't always get a chance to reach the drainhole in the bottom. Apart from cooling the interior of the car the other main benefit of air-con is that it delivers dry air to the windscreen making for faster demisting.
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