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[tunnie]

So I've compression tested my trusty steed, have to say there is something about working at night with head lamps 

Now instructions said do it with warm engine, I did it while cold. Any impact?

Results:

Pot 1 = 15.5 Bar
Pot 2 = 15.3 Bar
Pot 3 = 15.8 Bar
Pot 4 = 16.0 Bar

So all consistent and about the same, so it looks like HG has survived?

[serek]

those values looks good lucky you 

[tunnie]

Next stop, water pump 

[05omegav6]

Next stop, water pump and cambelt 

Just to be sure

[tunnie]

It starts and revs ok so if Cambelt was feked, don't think I would have made it home?

[Kevin Wood]

Water pump wouldn't bother the cam belt if it had just lost its' impeller. Either thst or the thermostat has failed. Was the heater blowing hot after it failed? Was it happy running on lpg?

If yes to both, i'd say the thermostat is favourite.

[05omegav6]

Only suggested cambelt as you need to remove it to swap the pump out and if the pump has wept as a side effect then it won't have done the belt any favours...

Thermostat only just been done, no?

[tunnie]

So the stat.... I fitted a genuine GM one bought from a dealer. When purchasing I gave the part number supplied here, parts bloke said it was super seeded with xyz part number. I fitted the stat but it would never go above 75c, in the morning it would get to 75 and stat would open, temp dropped almost to end stop!

So I fitted one from ECP as a test, it's been fine since. (Around 6 weeks ago) Running bang on 85c as it should do, all of the time.

What's best way to test stat? Will it be visually obvious it's failed/stuck?

[tunnie]

Heat was good and it's been fine on LPG 

[tunnie]

Also AA bod put a pressure gauge on coolant bottle, there was no change in pressure when the engine was revved?

[Kevin Wood]

Also AA bod put a pressure gauge on coolant bottle, there was no change in pressure when the engine was revved?

Just suggests it's not a catastrophic head gasket failure.

You can test the thermostat by putting it in a pan of boiling water and checking that it starts to open.

[tunnie]

So just for my understanding, with engine at normal temp and everything as it should be. You would not expect to see pressure changes in coolant system under RPM changes?

I'll pop the stat off at the weekend, pop it in some boiling water. I take it I will see the coiled part retract slightly? If nothing then it's stuck shut?

I guess that would give the same symptoms? - Coolant in the engine block gets too hot, the stat refuses to open, thus not allowing colder coolant in from the rad into the block?

[zirk]

Take it LPG's been plumbed in correctly, as you say check Stat first then Pump, but I had a 2.0 LPG from a Member here about 5 yrs back (diagnosed as HG Failure by his Garage, which it wasn't), the thing was all over the place on temperature, especially in cold weather like were having now, changed stat, convinced that was the problem, but latter found out the LPG Vap was furbed and effecting temp. 

[tunnie]

Take it LPG's been plumbed in correctly, as you say check Stat first then Pump, but I had a 2.0 LPG from a Member here about 5 yrs back, the thing was all over the place on temperature, especially in cold weather like were having now, changed stat, convinced that was the problem, but latter found out the LPG Vap was furbed and effecting temp. 

Hummm interesting, not considered that. LPG installed by Lazydocker, so it's about as right as something can get! Never missed a beat since 135k install.

Did he have issues running on LPG with temp over the place? It's running fine on gas or petrol, but having temp issues as described above.

[zirk]

I took it on as possible cheap repairer, (Craig from Watford from memeroy), His Garage had diagnosed as HG fail, sniff test, as temperature would run hot, cold, etc). I wasn't convinced it was HG.

Car would run fine, on Petrol and LPG, would take ages to get warm then overheat, go cold etc, very occasionally, if you took it on a long run (cold weather) LPG would start be hesitant, then switch off, car would get hot again, stop car, wait 5 mins off you go again for any to 10 to 100 miles.?

As said I was convinced it was an iffy stat, and, or, needed a good flush, but as said turned out to be the Vap in the end.