gurgling noise coming from behind the dash board

elainesvolvo · Dec 7th, 2013, 17:13

Hi I've noticed since installing the thermostat that when im driving ie accelerating there is a gurgling noise coming from behind the dash, I think its coming from the heater matrix? Am I to assume the compression gases are causing air locks in the system? The heater on my journey was nice and warm, then after the gurgling noise it became stone cold is it worth removing the thermostat or buying an 82 degree one? The head gasket is leaking into the cooling system.

Many thanks

Clan · Dec 7th, 2013, 17:25

I would let it cool down , top up in the morning and see how it goes , Air locks on volvos cure themselves if all is well . No point in changing to a cool thermostat , bad move all round that ..

elainesvolvo · Dec 9th, 2013, 14:51

I've put the old thermostat back in ie the one that has the middle cut out, hopefully that will cure the gurgling 😁

Cornishv40 · Dec 9th, 2013, 15:26

Quote:

Originally Posted by elainesvolvo

I've put the old thermostat back in ie the one that has the middle cut out, hopefully that will cure the gurgling ��

Just got to wait a bit longer now for the heater to work! lol

As I said before, my local garage advised me to remove the stat to help with the back pressure etc.

skyship007 · Dec 9th, 2013, 15:33

Quote:

Originally Posted by cornishv40

Just got to wait a bit longer now for the heater to work! lol

As I said before, my local garage advised me to remove the stat to help with the back pressure etc.

Sounds like a rather odd idea. Some of the Volvo thermostats are not the same as non OEM ones as they have a vent hole.

Cornishv40 · Dec 9th, 2013, 15:53

Quote:

Originally Posted by skyship007

Sounds like a rather odd idea. Some of the Volvo thermostats are not the same as non OEM ones as they have a vent hole.

They are 'rather odd' at the garage.

elainesvolvo · Dec 9th, 2013, 16:00

The original one has the vent hole in.

Cornishv40 · Dec 9th, 2013, 16:50

Quote:

Originally Posted by elainesvolvo

The original one has the vent hole in.

Mine has a big vent hole!

elainesvolvo · Dec 9th, 2013, 17:23

Mine now has too, the back pressure today was huge lol had to undo the bleed screws. I couldn't undo the cap. Thermostat out and back to normal lol

Neil H · Dec 27th, 2013, 22:41

I have this gurgling too, what was your final fix for this? Take the thermostat out totally ?

Dec 7th, 2013, 17:13	#1
elainesvolvo Senior Member Last Online: Apr 25th, 2015 17:33 Join Date: Sep 2013 Location: sittingbourne	gurgling noise coming from behind the dash board Hi I've noticed since installing the thermostat that when im driving ie accelerating there is a gurgling noise coming from behind the dash, I think its coming from the heater matrix? Am I to assume the compression gases are causing air locks in the system? The heater on my journey was nice and warm, then after the gurgling noise it became stone cold is it worth removing the thermostat or buying an 82 degree one? The head gasket is leaking into the cooling system. Many thanks Last edited by elainesvolvo; Dec 7th, 2013 at 17:15. Reason: forgot info

Dec 7th, 2013, 17:25	#2
Clan Experienced Member Last Online: Today 16:01 Join Date: Jun 2007 Location: L/H side	I would let it cool down , top up in the morning and see how it goes , Air locks on volvos cure themselves if all is well . No point in changing to a cool thermostat , bad move all round that .. __________________ My comments are only based on my opinions and vast experience .

Dec 27th, 2013, 22:41	#10
Neil H New V40 Owner Last Online: Sep 21st, 2022 22:03 Join Date: May 2013 Location: London	I have this gurgling too, what was your final fix for this? Take the thermostat out totally ? __________________ London, UK Current Car - 1999 T4 V40 Ph1 66k AKA "Heather" My Previous Car: V40 2.0T 2000 Volvo V40 2.0T (B4204T3)

Dec 9th, 2013, 14:51	#3
elainesvolvo Senior Member Last Online: Apr 25th, 2015 17:33 Join Date: Sep 2013 Location: sittingbourne	I've put the old thermostat back in ie the one that has the middle cut out, hopefully that will cure the gurgling 😁

Dec 9th, 2013, 16:00	#7
elainesvolvo Senior Member Last Online: Apr 25th, 2015 17:33 Join Date: Sep 2013 Location: sittingbourne	The original one has the vent hole in.

Dec 9th, 2013, 17:23	#9
elainesvolvo Senior Member Last Online: Apr 25th, 2015 17:33 Join Date: Sep 2013 Location: sittingbourne	Mine now has too, the back pressure today was huge lol had to undo the bleed screws. I couldn't undo the cap. Thermostat out and back to normal lol

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