More unlikely problems

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DARK STAR
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More unlikely problems

Post by DARK STAR » Sat Dec 28, 2019 10:02 pm

This was on the boss's Calibra but the sequel could apply to any car.

Stuck in an enormous traffic jam in Nice I noticed the temperature rising alarmingly.
Remembering that the temperature switch in the radiator had already unplugged itself once I dived under the bonnet and gave the plug a wiggle and a push.
No reaction from the fan, I retreated (luckily) to switch off - and the radiator exploded :shock:
The temp gauge was reading 110º.
Should there not be some sort of pressure relief cap in the system, the reservoir filler cap seems to be solid ?

The insurance company sent a recovery truck in about 20 minutes, luckily the traffic jam was sorted by then.
The driver said he couldn't take the car all the way home (20 km, in my rich experience they usually do better than that :roll: )
So next day I went with a friend and his car-carrier to the recovery depot.
Where the fairly unpleasant receptionist told me they had taken the car to a garage the other side of Nice, probably as far away (in the opposite direction) as our house.
Finally arriving at the right place the puzzled garage owner had no idea why they dumped the car on him and apologized for the inconvenience.
A few minutes later the insurance company sent me a message with a questionnaire of satisfaction.
I thought of the Rolling Stones.

To get to the technical side, I checked the fan, I checked the temperature switch, I checked the wiring.
As I think Sherlock Holmes said, once you have eliminated all but one possibility you have found the culprit - it could only be the plug.
Now to get just a plug for a specific purpose like this is another impossibility.
But thinking of how I had connected my multi-meter to the switch ... I cut the plug off, fixed a couple of spade terminals in its place and all is right with the world.

As usual I have to ask, why do car manufacturers make everything so complicated?

Sorry for picture quality, my camera wouldn't fit in the space so I used my phone.
rad1.jpg
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rad3.jpg
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rad5.jpg
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Chris Johnson
RSSOC 1979> Rhubarb SE6a V8 1979-1997 Dark Star Coupé 1989> Scimitar France 2010> Vert Soleil GTC 2014-2018
Scimitar France Website site Scimitar EUROPEEN
On the road I don't drive fast, but I don't slow down for corners
In competition I drive very fast, but not always on the track ...

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scimjim
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More unlikely problems

Post by scimjim » Sat Dec 28, 2019 10:54 pm

The system PRV is the pressure cap on the expansion tank.


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DARK STAR
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More unlikely problems

Post by DARK STAR » Sun Dec 29, 2019 7:32 am

Thought so, though it's plastic unlike any other pressure cap I've ever seen.
Perhaps I should get a new one 8)


Chris Johnson
RSSOC 1979> Rhubarb SE6a V8 1979-1997 Dark Star Coupé 1989> Scimitar France 2010> Vert Soleil GTC 2014-2018
Scimitar France Website site Scimitar EUROPEEN
On the road I don't drive fast, but I don't slow down for corners
In competition I drive very fast, but not always on the track ...

efi_sprintgte
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More unlikely problems

Post by efi_sprintgte » Sun Dec 29, 2019 8:36 am

Check coolant is flowing correctly, also check for blockages.

Perhaps the rad was partially blocked causing it to blow?


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More unlikely problems

Post by gtcse8 » Sun Dec 29, 2019 10:09 am

Chris have you not had this trouble before ??.
Mark


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DARK STAR
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More unlikely problems

Post by DARK STAR » Sun Dec 29, 2019 11:19 am

Rad was new last year, the cooling system works perfectly when the fan switches on in time 8)
Presumably it blew because of steam pressure, though I wouldn't have expected water under pressure to boil at 110º ?
Now I have replaced the plug it works fine, but I will also replace the filler cap in case it boils again.

Mark, last time I thought the problem was the temperature switch and replaced it - but it was probably perfectly all right in view of the subsequent blow up :roll:
Last edited by DARK STAR on Sun Dec 29, 2019 3:58 pm, edited 1 time in total.


Chris Johnson
RSSOC 1979> Rhubarb SE6a V8 1979-1997 Dark Star Coupé 1989> Scimitar France 2010> Vert Soleil GTC 2014-2018
Scimitar France Website site Scimitar EUROPEEN
On the road I don't drive fast, but I don't slow down for corners
In competition I drive very fast, but not always on the track ...

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Old and Slow
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More unlikely problems

Post by Old and Slow » Sun Dec 29, 2019 2:34 pm

I think water boiling at 110 deg C implies the pressure in the rad was 5 psi above atmospheric.
https://www.engineeringtoolbox.com/boil ... d_926.html
A rad filler cap would be 13 psi usually? If so, it wouldn't have blown.


Philip Needham
Ashley-bodied TR3; '54 Ford Consul; '55 AC 2-Litre Saloon;'65 850 Mini; '70 Ford Zodiac MkIV; XR3i
'81 911SC Targa, '64 Sabre Six

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DARK STAR
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More unlikely problems

Post by DARK STAR » Sun Dec 29, 2019 3:59 pm

Hmm, I've always had doubts about plastic radiators, but to be fair it's the first time in 20 years (and 3 or 4 radiators) that I've encountered this problem.


Chris Johnson
RSSOC 1979> Rhubarb SE6a V8 1979-1997 Dark Star Coupé 1989> Scimitar France 2010> Vert Soleil GTC 2014-2018
Scimitar France Website site Scimitar EUROPEEN
On the road I don't drive fast, but I don't slow down for corners
In competition I drive very fast, but not always on the track ...

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