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Discussion Starter #1
So over the W/E I changed the thermostat on my son's car. Left it sitting on the drive idling for 20 mins or more and took it for a 5 mile test drive and all was perfect.

He drove to work today and all was well.

At lunch time he sat in the car with engine running and saw the temp gauge climb towards 100 deg. Thankfully he stopped the car to have a look. Big puddle of coolant under the car and the plastic main hose connector on the thermostat has separated from the aluminium casting.

I suspect that the only way to check if head gasket is also destroyed is to fit new thermostat and run the car.

The failed thermostat is made by "Circoli."

In the picture below you can see the failed (broken) stat under and to the left of the air intake pipe.
 

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Discussion Starter #3
If the pic is the item that is on sale then the top hose fitting even has the notch in the right place. The Circoli one was 90 deg further clockwise than the original.
 

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It's a genuine stat so yes it has the notch in the correct place. The aftermarket ones I have used previously have, as you say, the notch 90* round from where it is on the original.
 

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Just had one of these blow apart on the M6! Only 30 miles driven! Obviously have a major design fault - DO NOT BUY THIS CRAP!!!!
 

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So over the W/E I changed the thermostat on my son's car. Left it sitting on the drive idling for 20 mins or more and took it for a 5 mile test drive and all was perfect.

He drove to work today and all was well.

At lunch time he sat in the car with engine running and saw the temp gauge climb towards 100 deg. Thankfully he stopped the car to have a look. Big puddle of coolant under the car and the plastic main hose connector on the thermostat has separated from the aluminium casting.

I suspect that the only way to check if head gasket is also destroyed is to fit new thermostat and run the car.

The failed thermostat is made by "Circoli."

In the picture below you can see the failed (broken) stat under and to the left of the air intake pipe.
:censored: that is a shocker..

hope the HG is O.K, as your son caught it early and at idle it should be alright unless the stat failed because of exhaust gases pressurizing the coolant.

fingers crossed here for you..


be interested to know how this turns out.
 

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Discussion Starter #7 (Edited)
Thanks for asking. His car seems to have withstood the thermostat failure as he's driven about 350 miles since then and coolant level has remained rock steady. He does get a small amount of mayonnaise in the oil filler but he only does 4 - 5 mile journeys to and from work and the car has always done this so nothing new and to be expected with such short
journeys.

Replacement for the failed Circoli was Calorstat. Calorstat has visible adhesive around the joint between the aluminium section and plastic section. Also the sealing ring provided with the Calorstat to seal between stat and engine block was square whereas the Circoli was a round "O" ring and rather poor fit. I have never had problems with Calorstat thermostats and have also used their water pumps without problems.

Have now even treated the car to a new expansion tank as the old original one was a bit cruddy and getting hard to see the (red) coolant level.
 

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Thanks for asking. His car seems to have withstood the thermostat failure as he's driven about 350 miles since then and coolant level has remained rock steady. He does get a small amount of mayonnaise in the oil filler but he only does 4 - 5 mile journeys to and from work and the car has always done this so nothing new and to be expected with such short
journeys.

Replacement for the failed Circoli was Calorstat. Calorstat has visible adhesive around the joint between the aluminium section and plastic section. Also the sealing ring provided with the Calorstat to seal between stat and engine block was square whereas the Circoli was a round "O" ring and rather poor fit. I have never had problems with Calorstat thermostats and have also used their water pumps without problems.

Have now even treated the car to a new expansion tank as the old original one was a bit cruddy and getting hard to see the (red) coolant level.
These Circoli thermostats are currently being supplied by Eurocarparts at £13 a pop - which worries me, as I'd always assumed ECP supplied only OEM or similar quality parts. About to buy a 'stat, so now I'm slightly worried as to which manufacturer to go for. First Line are supposed to be reasonably good - anyone any experience?
 

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ECP seem to specialise in selling cheap items of dubious quality. I have been unimpressed with their operation from the parts they sell to their service or lack of.

I leave them to those who drive 'superior' German cars. :D
 
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