Thermostat

wulfgar2k · Post by **wulfgar2k** » 05 Jan 2011, 16:41

Hi
went out in the car( 306 1.6) the other day after 5 miles, the engine was really hot pulled over and the engine red hot but the rad was cold!!
Thermostat i thought got a new the one with the plastic housing, pit on the car just same (hot engine,cold rad) put Thermostat in a bowl of boiling water nothing happen....
Back to the spares shop got a new one fitted it still same, run engine without Thermostat engine warm, rad warm, hoses warm and the temp gauge at 70 instead of in the red,
Please tell me what is going on here
can 2 Thermostat be duff
Cheers

Post by **myglaren** » 05 Jan 2011, 16:48

How long did you wait for them to open?
Yes, several can be duff, part of a duff batch probably.

wulfgar2k · Post by **wulfgar2k** » 05 Jan 2011, 16:50

5 mins but the engine was so hot by then.

Post by **myglaren** » 05 Jan 2011, 16:52

5 mins would be adequate - some folks expect them to snap open when warmed.

wulfgar2k · Post by **wulfgar2k** » 05 Jan 2011, 17:17

So get another Thermostat and try again....

Oldpug · Post by **Oldpug** » 05 Jan 2011, 18:55

I`ve worked on these TU engines for years and one out of a hundred just will not bleed properly.A few months ago I had the same symptoms as yours AFTER! refitting the head with new w/pump,stat etc.I was convinced I`d messed up the job somewhere, but spent hrs doing "force bleeding" etc and it suddenly came right.Dont ask me why,the cars still running like a dream.

Post by **Peter.N.** » 05 Jan 2011, 21:36

That used to be a problem with XUD engines, many a head was cracked by inadequate bleeding so that could well be your problem. Disconnect one of the heater hoses and fill the system until water flows freely, if it doesn't, start the engine.

Peter

wulfgar2k · Post by **wulfgar2k** » 06 Jan 2011, 00:39

Thanks for all your help i will try in the mourning to bleed it and bleed it again, shall i open up the bleed vavle on the heater hose all the way or take off one of the hoses..

Cheers

Post by **myglaren** » 06 Jan 2011, 03:19

Bleed valve should be fine - sometimes it helps to make a header tank, cut the bottom off a 2 coke bottle and shove it into the filler like s funnel, but tight, may need some blue tack to seal it sufficiently, then fill it right up (assistant helps) and open the bleed caps.
We did my son's 306 the other day and it went fine without the header tank.

addo · Post by **addo** » 06 Jan 2011, 06:11

I would first determine there is adequate coolant in the system! It may be well underfilled.

wulfgar2k · Post by **wulfgar2k** » 06 Jan 2011, 13:53

Still no luck....but the word is keep at it untill it works and a plastic milk carton seems to fits better and thanks to all of you..

By the way it;s not getting me down yet...IT'S ONLY A CAR

wulfgar2k · Post by **wulfgar2k** » 06 Jan 2011, 21:41

At it all day no luck yet..with the Thermostat.

wulfgar2k · Post by **wulfgar2k** » 07 Jan 2011, 13:00

Snow here so had to leave it till later

Oldpug · Post by **Oldpug** » 08 Jan 2011, 16:37

Just a thought?when you open the bleed screw at the stat` end of the cylinder head WITH the engine running do you get good jet of water??in other words are you getting good pressure in the system? It has been known for the impeller of the water pump to fail and not circulate the water.ie hot block/cold rad.

wulfgar2k · Post by **wulfgar2k** » 08 Jan 2011, 23:03

Oldpug been at it all day with coke bottles etc etc and still got hot engine + cold rad and get a great jet of water (like somebody having a *iss) and it is hot as my hand can tell you.
So back to the start and get a new thermostat the third one from a different spares place, i have had two new line Thermostats is there other makes around?????...it's to car spares on Sunaday then for me.
Also thanks for the info Oldpug....