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Saltyhair81
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Yes you are correct. The cooling system was over efficient and means the car once moving drops temp and changes to a cold map.  Means it burns through fuel like no tomorrow and runs rough.  Running temp should be 80-90 deg and it runs at approx 40-50 max. 

620S SV

7 wonders of th...
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It's not a case of being over efficient, more a case of being unregulated due to there being no thermostat fitted in the cooling system or for that matter in the oil system either, CC regulate the later by removing the front number plate to increase airflow.

The car should never have been 'signed off' in this condition considering this is sold a a road car.

the over fueling as it repeatadly drops into the warm up map will cause other issues too, bore wash etc, its a bigger issue than the heater not working !

 

StevehS3
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Would the car pass a MOT emissions test running like that? For the cost of a test that might be worth doing. Personally I would approach the dealer if it isn't capable of passing a MOT.

ScottR400D
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#23 Exactly! 

L7C
ScottR400D
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#24 I guess if the car's left stationary it will heat up and could well pass the MOT. It's when cruising along  that the unregulated cooling system brings it right down. 
 

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StevehS3
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If it will pass an MOT, is unchanged from how CC built it originally and CC consider it to be OK then I think you are relying on goodwill from the dealer to contribute towards the cost of the work.

John Vine
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#23: Agree 100%.   Out of interest, are there any owners yet who've reported demonstrable engine damage due to over-cooling?

#27:  That's precisely why I suggested (in #17) it would be unwise to antagonise the dealer.  Going for rejection will surely do exactly that, yet could well prove fruitless anyway.  But I take it that CC no longer "consider it to be OK" given that they've developed a fix?

JV

ScottR400D
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"If it will pass an MOT, is unchanged from how CC built it originally and CC consider it to be OK then I think you are relying on goodwill from the dealer to contribute towards the cost of the work."
 

Why should CC considering it to be OK, when it clearly and indisputably isn't, carry any weight at all? Or whether or not it will pass an MOT test, for that matter?

 

 

L7C
TomB
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Put principals to one side - you wont win either way, Caterham are useless, and its not the dealers fault.  Unless you've got a pot load of cash and want to sue Caterham!

Can you pick up the parts and sort it yourself or via a 7 specialist like PGM then enjoy the car as spring and summer comes?       

PGM
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If you have a look at our website https://www.pgmsussex.com/upgrade-kits and read the details it explains the kits we have available for the various 620 issues and upgrades. Just scroll down the page and you will see the cooling kit listed.

There is also a link to the start of the development for the over cooling issue which was originally a joint project between Mark Weatherby and Igor Fedor. Here is a link to an article in Low Flying.

https://www.pgmsussex.com/_files/ugd/a3e364_2ffc471a99f8410fb2c7868da09405a5.pdf?index=true

PGM took over developing a repeatable kit with some slight variations to the original design in order to make it available to 620 owners. This was because we had numerous 620 customers who wanted the issue sorted out and Mark and Igor were happy for us to make it available.

Please feel free to give us a call if you need any help or advice. There won't be any hard sales only honest advice.

Do get the issue sorted out though, whichever course you take.

Best wishes PGM