heater core housing bolts

[Low87]

I need to remove the box on the interior side of the firewall to get to the heater core.  The fasteners I see from the interior have what look like nail heads (smooth, round & flat).  Are these rivets, or are there nuts on the engine side of the firewall?

[sonicbluezx3]

I had to remove the nuts from the engine side of the firewall for that to come out. I tried to pry on those fasteners on the inside and got no where. I think they are 11mm nuts. Would be handy to have a gear wrench... or a deep well socket.

[beastie_3]

Yup, nuts are on the engine side of the firewall. To save frustration, drop out the wheel well.

[ehjorten]

There is also one bolt from the inside on the far passenger side I think.

[Low87]

Is there a photo anywhere of where the nuts are?  I can't see them. Do I have to remove the suitcase on the firewall to access?

[Captkaos]

Erik is right, the bottom bolt near the trans tunnel is backwards...