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Old 17th June 2021, 15:09   #1
Seagullsport
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Question Odd intermittant short 'moan'

My otherwise'perfect' 75 diesel emits what I can only describe as a short 'moan' or 'groan' every so often - never at speed - stationary or low speed usually. Does not seem to effect any operation in the car but a bit disconcerting. Any ideas anybody please ? Automatic gear box

Last edited by Seagullsport; 17th June 2021 at 15:12.. Reason: Forgot to mention it was an automatic gear box.
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Old 17th June 2021, 15:26   #2
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The air-con can do that now and then with the noise from behind the dash.--I think the forum description is ---whale whoop.---
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Old 17th June 2021, 15:34   #3
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I agree with COLVERT. Next time it happens, switch the air con off and see if the noise stops. It should stop straight away if that's the culprit.
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Old 17th June 2021, 17:07   #4
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Quote:
Originally Posted by COLVERT View Post
The air-con can do that now and then with the noise from behind the dash.--I think the forum description is ---whale whoop.---
At last, somebody else had a destroyer trying to enter harbour. My son heard this noise whilst in the car a few years back and it was just an intermittent background for a time and just stopped on it's own this year.
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Old 18th June 2021, 10:11   #5
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Quote:
Originally Posted by chaselpaso View Post
At last, somebody else had a destroyer trying to enter harbour. My son heard this noise whilst in the car a few years back and it was just an intermittent background for a time and just stopped on it's own this year.
Often an early warning that the system is about to stop working.------
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Old 18th June 2021, 12:16   #6
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It's the pressure relief valve operating in the heater box, usually it's because your low speed fan isn't working

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Old 18th June 2021, 12:33   #7
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Russ is correct I've also have had a few do this and it is usually the low speed fan not working
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Old 18th June 2021, 17:35   #8
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My whale has been whooping during the hot weather. Everything is working ok. I put it down to the hot weather. Only does it when firing up the aircon, not during its use.
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Old 21st June 2021, 09:17   #9
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Thank you Russ for your reply. Basically what do i need to replace so that I can tell my mobile mechanic (who is pretty good) what to get etc.
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Old 22nd June 2021, 07:05   #10
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Quote:
Originally Posted by Seagullsport View Post
Basically what do i need to replace ...
Hi John,

If you're satisfied that the noise is the air conditioning (i.e. it doesn't happen in 'Econ' mode) then start by checking that your low speed fan works by performing the "demist test".

If the fan doesn't work on low speed then we'll need to know whether you have a 3 speed or 2 speed (with resistor) system in order to advise on parts.

If the fan does work, call out a mobile air conditioning specialist to check the condition of your condenser and your refrigerant gas charge. If all's well there, suspect a the early stages of a failing crankshaft pulley (specific to the diesel).

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Last edited by SD1too; 22nd June 2021 at 07:09..
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