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Old 08-09-2013   #16
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Re: Broken thermostat - Is it difficult to change?

Hi Cjlar,
I got as far as the bottom 13mm nut between the steel whatever it is and the thermostat. Getting the 10mm nut that holds the steel tube in place off was easy enough but I couldn't work out how to get the steel thing off the bolt so I could get the 13mm nut undone because the steel tube thing felt like it was still fixed to something.

I'd taken off all of the hoses around the thermostat and the steel pipes either side of the steel tube (and temporarily lost one of the shims) but it still wouldn't come free.

Is it fixed to the thermostat itself?

I can understand why you would cut down a spanner to get into the nut on the bottom thermostat bolt. Whoever desgined it cleary had a warped sense of humour. I gave up trying to free the 13mm nut because I couldn't get the steel tube off the bolt. It moved by 5mm but not enough to slip off the bolt so I could get a socket in.

I gave up trying to get it off though because I couldn't get the steel tube out of the way. Was this a mistake and do the 2 come off together?
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Last edited by BrianMcL; 08-09-2013 at 22:30.
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Old 09-09-2013   #17
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Re: Broken thermostat - Is it difficult to change?

I don't remember any major issues with mine (other than the normal elastoplasts).

Things must be different in 8v-land. It might be worth a search over on www.vectra-c.com to see what they know - loads of these engines went into Vectras.
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Old 09-09-2013   #18
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Re: Broken thermostat - Is it difficult to change?

Hi Doofer,
Can you remember whether the metal tube fixed to the bottom thermostat stud was fixed to anything at the back?
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Old 09-09-2013   #19
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Re: Broken thermostat - Is it difficult to change?

Brian. I've just looked at ePER (you can do the same on this site) and it looks like the steel tube has a fixing plate on the opposite end of the tube where a large rubber hose is connected and goes to radiator offsite connection. Also there would appear to be two additional mounting tabs along the top of the pipe.

Hope this helps
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Old 10-09-2013   #20
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Re: Broken thermostat - Is it difficult to change?

I've had a look at eper (thanks Nick I always forget about it) and it looks as though the metal pipe (the heat exchanger part 55186465?) that bolts onto the same stud that holds the bottom thermostat bolt in place at the front also bolts directly onto the thermostat itself at the back.

Am I correct or is there another bolt holding the heat exchanger onto another part of the engine block somewhere?
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Old 22-09-2013   #21
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Re: Broken thermostat - Is it difficult to change?

That's the new thermostat fitted at long last. The problem was indeed additional mounting bolts holding the heat exchanger in place. One's a 13mm head and the other's a 6hex.
They are mounted to the back of the engine block and are most easily accessed by removing the EGR which is connected to the heat exchanger. They're to the right of the EGR and if you hold a small mirror round behind the back of the heat exchanger you should be able to find them.
With the EGR out and these two bolts undone the two bolts holding the thermostat can be undone. The top one's a 13mm bolt and easy enough. The bottom one had me stumped for ages but with the 10mm nut that holds the heat exchanger on the same bolt that holds the thermostat in place undone (and all of the connecting pipes undone, battery and box out, etc as well of course) you should be able to slip a 13mm socket spanner over the end and undo it. It will then come out and the new one can be fitted.

I can't make my mind up whether undoing the metal clamps that connect the metal pipes to the heat exchanger should be undone but if you do undo them watch for the small shims that are inside. Very easy to drop inside the engine.
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Old 23-09-2013   #22
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Re: Broken thermostat - Is it difficult to change?

Great news Brian.

I'm not sure if I'll be having to follow you down this route. During last winter and the colder morning we are now seeing my Croma takes time to heat up. If I get a good free power drive then the temperature guage gets up to normal (dead vertical) OK. In hot temps 36 deg C and towing the needle still does not move passed vertical.

However on the cold mornings then the guage will climb slowly to one division below normal. (1st double bars to left of vertical). It will then climb and fall between the one div below and vertical position under light engine load and overrun/deceleration. However drive at any speed with moderate load then the temp stay rock solid at the norm position.

I keep on meaning to do some runs with MultiECUScan connected to see a graph etc. and actually find out what temeperature the first div down is. 5 degrees, 10 degrees .... below normal.
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Old 23-09-2013   #23
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Re: Broken thermostat - Is it difficult to change?

Quote Originally Posted by s130 View Post
I keep on meaning to do some runs with MultiECUScan connected to see a graph etc. and actually find out what temeperature the first div down is. 5 degrees, 10 degrees .... below normal.
I wouldn't bother - just replace it. Mine's been boringly well-controlled ever since I changed mine about 2 years ago. It takes a few minutes to get to vertical, then it stays there - regardless of how I drive, what the temperature is etc.

If it's moving then it's knackered. I don't remember it being that traumatic a job - probably a quarter of an alternator change-worth of stress, from memory. The drain down and refill takes as long as changing it.
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Old 23-09-2013   #24
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Re: Broken thermostat - Is it difficult to change?

I agree with Doofer, I've also changed it a year ago and no problems since, the needle don't move a millimeter since the replacement even at -20 degrees. It is obvious that yours is about to "die".
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Old 23-09-2013   #25
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Re: Broken thermostat - Is it difficult to change?

It's definitely working much better this morning with the gauge going up to the centre after a few minutes and staying there.

Previously it wouldn't move much from cold unless it spent a long time idling on a hot day, and as soon as I moved off it would quickly cool down again.

Big problem in the winter obviously as the flip side is that the heater just never warmed up much, no matter how long it was left idling.

Looking forward to seeing how much of a difference it makes.
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Old 23-09-2013   #26
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Re: Broken thermostat - Is it difficult to change?

Quote Originally Posted by BrianMcL View Post
Big problem in the winter obviously as the flip side is that the heater just never warmed up much, no matter how long it was left idling.
The diesel engine will not warm up at idle like the gasoline engine, unless you have the additional and of course optional heater (webasto type). Trying to warm up the diesel engine at idle it's a waste of diesel, etc. To warm up after a cold start "Drive off slowly, letting the engine turn at medium revs. Do not accelerate abruptly".
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Old 23-09-2013   #27
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Re: Broken thermostat - Is it difficult to change?

Yes I'm aware my thermostat is probably on the way out. I'm expecting it to play even more silly *buggers. Usually I'm the first to jump in and fix stuff. Just wish it was doing what it has started to do when I replaced the cam belt, belt running gear and water pump. Waste of good and expensive antifreeze and deionised water.
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Old 23-09-2013   #28
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Re: Broken thermostat - Is it difficult to change?

Quote Originally Posted by s130 View Post
Waste of good and expensive antifreeze and deionised water.
I recovered mine in a clean big bowl (10 liters, one used for washing clothes manually). Cleaned the spoiler inside where the antifreeze will drop from radiator with a clean and wet cloth prior to release and all was perfect. I'm thinking to an alternate method also, were you can use a plastic cone with hose under the radiator draining hole to recover the antifreeze.
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Old 23-09-2013   #29
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Re: Broken thermostat - Is it difficult to change?

Well done Brian. I remember those rear bolts now. Amnesia must be a defence mechanism!
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Old 23-09-2013   #30
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Re: Broken thermostat - Is it difficult to change?

Can't take the credit cjlar - it was my neighbour that found them. I held the mirror and light and he got stuck in with the sockets.

Mission accomplished though and that's the main thing

The car definitely runs much better and I'm not sure why but seems to be using less fuel around town at least anyway.
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