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Chairbed3

Member
Sep 14, 2025
9
I have been reading about the CO method and have read here from posters who tried it in their cars or bathrooms that the interior gets too hot. How to go about it then?

1. Does this heat damage the car and is there any risk of catching fire?
2. If it's too hot then how are people able to lose consciousness after getting in?
3. Does it fill the car with smoke? I'm aware that you need to light it outside and take the smoldering coals inside.

Please help I tried scrolling through the CO mega thread but I couldn't find related information.
 
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locked*n*loaded

locked*n*loaded

Archangel
Apr 15, 2022
9,209
It will get hot in the car. If you want it to be more tolerable, do it in cold weather. You need to keep the container of charcoals away from upholstery, and you need to set the hot container on something non-heat conductive, like bricks or cement blocks. Breathing in the high level of CO is what makes you go unconscious. The charcoals should be lit outside the car and allowed to get burning until they are red-hot and not smoking (or smoking very little) before even moving them into the car. Once charcoals are in the car, you should allow time for the CO to build up before you get in the car. You need to know how much charcoal to use, what type, and you need to seal potential leak areas. If you screw it up, you can end up with permanent neurological damage that you'll have to live with should you survive the attempt.
 
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Nightfoot

Arcanist
Aug 7, 2025
416
It will get hot in the car. If you want it to be more tolerable, do it in cold weather. You need to keep the container of charcoals away from upholstery, and you need to set the hot container on something non-heat conductive, like bricks or cement blocks. Breathing in the high level of CO is what makes you go unconscious. The charcoals should be lit outside the car and allowed to get burning until they are red-hot and not smoking (or smoking very little) before even moving them into the car. Once charcoals are in the car, you should allow time for the CO to build up before you get in the car. You need to know how much charcoal to use, what type, and you need to seal potential leak areas. If you screw it up, you can end up with permanent neurological damage that you'll have to live with should you survive the attempt.
Would getting in the car after allowing CO time to build up cause the CO to escape when opening the door?
 
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Groundhog_Day

Groundhog_Day

Student
Dec 5, 2023
119

Zanexx's above thread is the only confirmed successful CO case I've read here. It was in the Malawi 2 tent, rather than a car, but I think the process is similar.

I don't think Zanexx mentioned the heat being a problem. It was late August in the north of England, and i'm guessing the nighttime temperature was cool outside.

I think post #164 in the above thread is important. After tipping the charcoal briquettes out of the chimney starter into the steel bucket, the plan was to wait for 1 and a half hours before getting into the tent with them.

By letting the briquettes cool down for this long, heat and smoke should not be a problem. The risk is the amount of CO being produced might start to decrease if you leave it too long. But waiting this time worked for Zanexx. The only way to know for sure would be to buy a good CO analyser capable of measuring PPM up to 10,000 PPM, and do testing.
 
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