Maybe if you have any of the extra head padding, take it away and see if it makes a difference
yup - we've done this, but he still just gets so hot! But it made a noticeable improvement.

I sometimes put a bamboo muslin in the seat before her to act like a liner because I can't think the synthetic materials that the seat must be lined with help much.
fantastic idea! will steal

A spray bottle of water you can spray over the top like a mist can help.

Do you have covers on your windows?
another great one! thanks! no to covers on the windows - we've got a very good tinting, but it happens even at night, and doesn't seem to be any better when it's cool ... he's just a little hot tamale man ...

... I think it's the extra insert that's in her seat. I went to remove it and it says it must be used in the rearward facing position - arrrgh!
definately - but we ended up having to take it out anyway, because it was pushing his head down, and we were worried about his neck, so out it came ... but he's forwards now, based on weight and length...

my kids are all sweat monsters too! My ds8 even wakes up in the morning with beads of sweat covering his nose an thats with his fan on full tit an no blankets! As for dd I just make sure she only has very little clothes on ie, just a singlet if I know we are going to be in the car longer than just down the road.
wowee!! J-man isn't at that point - though we do often have the pedestal fan on in his room to keep it circulating and to help a bit... and yes, singlet and nappy is sometimes his road gear

thanks for all the ideas, ladies