Hiss

[gravesyt]

Hi all over the last week i've had a rattle when labouring but now there is a hissing noise coming from the back of the R/S engine you only notice it when you turn it off it only dose it 3 or 4 time then stops . water and oil check out turbo work's ok no loss of power ;)

[DaveM]

Air Con ?

 

rattling compressor and hissing evaporator.... eek !

 

just guessing

[seatkid]

If the a/c is turned on (and working) then the hiss could be the expansion valve (connected to the evaporator) - this is normal but tends to get louder when gas is low.

 

If the a/c is not on then its probably a leak from the brake servo - check the brake pedal after the engine has been turned off for 20 seconds - if the first press gives a hard pedal (compared to normal engine on feel) then the vacuum has leaked through a faulty seal. You might want to fix this as it is a safety issue. *The brake pedal feels slightly spongy when there is vacuum assistance available. Normally this assistance is available for 2 or more brake actuations after the engine is switched off. The vacuum should be available for several minutes after the engine is switched (provided the brake pedal is not pushed)

[gravesyt]

Thank Seakid it's not the air con :D .it looks and sounds like brake servo seal ;) getting it checked out in the morning .there go's my weekend away <_< shall let you know