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Author Topic: Thermostat info  (Read 2643 times)

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Dave Elite

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Thermostat info
« on: 10 December 2009, 12:04:50 »
Hello can anyone tell me all the tools and socket sizes I'll need to change my thermostat? I need to know before i start. Thanks Dave
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Bionic

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Re: Thermostat info
« Reply #1 on: 10 December 2009, 12:23:09 »
Oh Dear!
This is not a very pleasant job and believe me, you will lose patience, skin and probably tears before it is done. Still, it is possible and although it took me a while it eventually got done.
Really the only special tools you are likely to need are set of Torx sockets and drivers, I bought the combined set from Halfords and they have done quite a lot of work now and are still in fine shape.
Do not be tempted to buy the 'after market parts' stick to the genuine Vauxhall ones or you may regret it and have to do the job again to sort out any leaks. There is a short posting in the Maintenance Guide section of this club that will guide you through it.
Best of LUCK.
Ray
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Matchless

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Re: Thermostat info
« Reply #2 on: 10 December 2009, 12:56:56 »
You replace the thermostat housing complete with insert, dont try to swap just the insert. New one should come complete with O ring seal and you will need two new O rings for the extension pipe.
The thermostat housing was modified on later engines (and most new spares) to have a thicker flange and so uses longer bolts, you might want to order these at the same time just in case.
5litres of pink antifreeze needed to complete the jub.
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Entwood

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Re: Thermostat info
« Reply #3 on: 10 December 2009, 14:17:00 »
Hide the swearbox ....   :)

The "bastard bolt" wll cause you to insert at least a weeks wages .. :)  I cheated and got EP & LK to do mine .. glad I did .. :)

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Re: Thermostat info
« Reply #4 on: 10 December 2009, 14:31:35 »
Quote
Hide the swearbox ....   :)

The "bastard bolt" wll cause you to insert at least a weeks wages .. :)  I cheated and got EP & LK to do mine .. glad I did .. :)


Which bolt is that? I got to do the stat on the 3.0 soon  :'(

Give me a 4 pot to maintain anyday, stat took about 20 mins  :D
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Entwood

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Re: Thermostat info
« Reply #5 on: 10 December 2009, 15:45:26 »
Quote
Quote
Hide the swearbox ....   :)

The "bastard bolt" wll cause you to insert at least a weeks wages .. :)  I cheated and got EP & LK to do mine .. glad I did .. :)



Which bolt is that? I got to do the stat on the 3.0 soon  :'(

Give me a 4 pot to maintain anyday, stat took about 20 mins  :D

I believe its the bolt that holds the link pipe, lifting lug, dipstick and something else ... difficult to get to and very difficult to get all the bits to line up ....  EP gave up but Daz got it eventually on mine ... and if cursing mended cars then mine won't need anything doing for a long, long time !!

As I said .. I'm just glad I paid those guys to do it .. !!
« Last Edit: 10 December 2009, 15:45:48 by entwood »
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Dave Elite

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Re: Thermostat info
« Reply #6 on: 10 December 2009, 16:54:47 »
Thanks for all the help and warnings :). It needs doing I've been putting it of for a while now. Anyone know what size torx sockets? thanks again Dave
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Entwood

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Re: Thermostat info
« Reply #7 on: 10 December 2009, 17:22:28 »
Dave ... guide is here and suggests a 10mm spanner not a torx for the bastard bolt ...

http://www.omegaowners.com/forum/YaBB.pl?num=1229464812

Have a good read of as many threads on the subject as you can ... memory suggests there was a good tip about not undoing the housing and twisting the link pipe to loosen it, then undoing the housing, or something on those lines !!

HTH
« Last Edit: 10 December 2009, 17:24:02 by entwood »
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Dave Elite

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Re: Thermostat info
« Reply #8 on: 10 December 2009, 17:42:24 »
Thanks, I'm not looking forward to doing this.
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robson

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Re: Thermostat info
« Reply #9 on: 10 December 2009, 20:43:06 »
Has anybody tried putting an in line hose thermostat on a V6 if the existing thermo is failed open. Would be simple to do but would it work
Ron
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Dave Elite

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Re: Thermostat info
« Reply #10 on: 21 December 2009, 19:28:56 »
Quote
Has anybody tried putting an in line hose thermostat on a V6 if the existing thermo is failed open. Would be simple to do but would it work
Ron
Would this work?
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Andy H

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Re: Thermostat info
« Reply #11 on: 21 December 2009, 19:54:46 »
Quote
Quote
Has anybody tried putting an in line hose thermostat on a V6 if the existing thermo is failed open. Would be simple to do but would it work
Ron
Would this work?
I doubt it. The standard thermostat is in the heart of the engine and is exposed to the coolant being pumped around inside the engine. When it is half open some water goes to the rad and some back to the block. When it is fully open the port to the block is closed and all the flow goes to the radiator.

An external one wouldn't know when the engine was hot because it would be in a cold pipe away from the heat source.
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Dave Elite

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Re: Thermostat info
« Reply #12 on: 21 December 2009, 20:04:24 »
Quote
Quote
Quote
Has anybody tried putting an in line hose thermostat on a V6 if the existing thermo is failed open. Would be simple to do but would it work
Ron
Would this work?
I doubt it. The standard thermostat is in the heart of the engine and is exposed to the coolant being pumped around inside the engine. When it is half open some water goes to the rad and some back to the block. When it is fully open the port to the block is closed and all the flow goes to the radiator.

An external one wouldn't know when the engine was hot because it would be in a cold pipe away from the heat source.
Thanks. Is it possible to just replace the stat and not the housing?
« Last Edit: 21 December 2009, 20:05:18 by MV6Dave »
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Entwood

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Re: Thermostat info
« Reply #13 on: 21 December 2009, 20:07:01 »
Quote
Quote
Quote
Quote
Has anybody tried putting an in line hose thermostat on a V6 if the existing thermo is failed open. Would be simple to do but would it work
Ron
Would this work?
I doubt it. The standard thermostat is in the heart of the engine and is exposed to the coolant being pumped around inside the engine. When it is half open some water goes to the rad and some back to the block. When it is fully open the port to the block is closed and all the flow goes to the radiator.

An external one wouldn't know when the engine was hot because it would be in a cold pipe away from the heat source.
Thanks. Is it possible to just replace the stat and not the housing?


I guess so .. but as you have to take the housing off to get to the thermostat, and a new housing comes with the new 'stat (from GM) ... why would you want to ?? :)
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Dave Elite

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Re: Thermostat info
« Reply #14 on: 21 December 2009, 20:19:03 »
Quote
Quote
Quote
Quote
Quote
Has anybody tried putting an in line hose thermostat on a V6 if the existing thermo is failed open. Would be simple to do but would it work
Ron
Would this work?
I doubt it. The standard thermostat is in the heart of the engine and is exposed to the coolant being pumped around inside the engine. When it is half open some water goes to the rad and some back to the block. When it is fully open the port to the block is closed and all the flow goes to the radiator.

An external one wouldn't know when the engine was hot because it would be in a cold pipe away from the heat source.
Thanks. Is it possible to just replace the stat and not the housing?


I guess so .. but as you have to take the housing off to get to the thermostat, and a new housing comes with the new 'stat (from GM) ... why would you want to ?? :)
Because the one I bought (A QH part from a factors) only came with the stat and a couple of seals.
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