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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Low87 on September 20, 2011, 02:33:48 pm

Title: heater core housing bolts
Post by: Low87 on September 20, 2011, 02:33:48 pm

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?

Title: Re: heater core housing bolts
Post by: sonicbluezx3 on September 20, 2011, 03:35:58 pm

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.

Title: Re: heater core housing bolts
Post by: beastie_3 on September 20, 2011, 06:19:35 pm

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

Title: Re: heater core housing bolts
Post by: ehjorten on September 21, 2011, 02:00:48 pm

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

Title: Re: heater core housing bolts
Post by: Low87 on September 21, 2011, 04:56:32 pm

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?

Title: Re: heater core housing bolts
Post by: Captkaos on September 21, 2011, 05:48:33 pm

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