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I had the dreaded coolant leaks show up with my 2012 12C coupe today. Coolant is dripping from holes in the front subframe. I started the car and ran it for about ten minutes to put it up on lift. Temperature in the garage was about 35 degrees Fahrenheit at the time. I have never had any previous noticeable leaks. I removed the trunk tub and can’t see any fluid. I removed the long, center bottom panel and found two leaks of the driver’s side connections at the rear of this panel (3rd pic). Does anyone know the size of these clamps? My next plan will be to remove the washer fluid reservoir and check clamps behind it. Does anyone know the size of these clamps? I’ve found a few threads about it but nothing that lists the clamp size. I also found a small leak in the rear (4th pic) that has left some blue residue. Any idea which line this could be coming from? Thank you for any advice.
 

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I'm not a mechanic, but when this happened on mine, turned out to be a cracked head pumping exhaust gasses into the coolant chamber. One giveaway sign / symptom was the multiple failure of different clamp locations all within a few weeks. (And simultaneously plumes of white smoke started appearing on start-up). I hope it's just the clamps, but I always think it's odd to have multiple failure points at the same time. Hoping your car is under warranty.
 

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it wont be a cracked head, thats pretty rare make sure there is no air in the system and it is also not over filled, this can cause seepage. There is a test you can buy for checking for exhaust gasses in the coolant. Ive looked into it and its meant to be pretty accurate. It works by the exhaust gas particles being able to breach the plastic bag. See below. Give it a go for peace of mind I would say but a cracked head is unlikely.

 

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“I’m a Tuner”
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@mebke1,

I'm pretty sure you have just one clamp actively leaking the coolant you saw on the ground... and in your search you stumbled upon multiple other hoses that have been slowly seeping for some time.

I recommend change any clamp that has signs of past leaking coolant residue because sooner or later it will fail.


Just buy a variety pack of hose clamps at the auto parts store. You will quickly determine exactly which ones you want to use as you replace them. Get the wider band, screw down style.

And I would not worry about cracked heads at this point. The issue did happen to some cars, but was rare.


Kevin P
Supercar Garage - The McLaren Specialist
770-284-0172

Kennesaw GA
* Home of the flying McMedics... The only mobile McLaren Specialist! -We come to you!
 

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You can buy a complete upgrade hose clip set it 18 pieces from Thorney motorsport
This is a great recommendation... If he has 30 days to wait for those clamps to arrive in the USA.

The last time I ordered that "clamp kit" it was not a Pandemic with supply shortages and shipping issues. And way back then, the cost of shipping plus VAT or other import fees doubled the clamp kit price as well. Now I just stock high quality clamps in the shop in advance of any leaking McLaren's coming in for help.


Clamp Quality is important! But it is not rocket science (If it was, EVERY Ford and Chevy on the road today would be leaking like crazy! LOL) You can find quality clamps at local parts stores if you are in a pinch to get the car back on the road.

Wait? Tell me again "WHY" did McLaren use these terrible clamps for so long? And Ford and Chevy have it already figured out? :unsure:


Kevin P
Supercar Garage - The McLaren Specialist
770-284-0172

Kennesaw GA
* Home of the flying McMedics... The only mobile McLaren Specialist! -We come to you!
 

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This is a great recommendation... If he has 30 days to wait for those clamps to arrive in the USA.

The last time I ordered that "clamp kit" it was not a Pandemic with supply shortages and shipping issues. And way back then, the cost of shipping plus VAT or other import fees doubled the clamp kit price as well. Now I just stock high quality clamps in the shop in advance of any leaking McLaren's coming in for help.


Clamp Quality is important! But it is not rocket science (If it was, EVERY Ford and Chevy on the road today would be leaking like crazy! LOL) You can find quality clamps at local parts stores if you are in a pinch to get the car back on the road.

Wait? Tell me again "WHY" did McLaren use these terrible clamps for so long? And Ford and Chevy have it already figured out? :unsure:


Kevin P
Supercar Garage - The McLaren Specialist
770-284-0172

Kennesaw GA
* Home of the flying McMedics... The only mobile McLaren Specialist! -We come to you!
I just bought the kit and it is stock
 
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