Dash duct work....
Thread Starter
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
Dash duct work....
Took the old girl out for a long hard run tonight and the temps began to soar in the cabin around my feet. Turned on the blower fan and played with the heater controls....Still got hot feet!
Looking back through some receipts, it appears the previous owner may have removed/replaced dash but not replaced the ducting when reassembling it all. I can hear what sounds like vacuum actuated vents etc working when I turn the heater control.
How easy is it to check and refit ducting if required? Do I need to pull the dash etc or can this be done bent double upside down, just like most other jobs on the Vette!!!
Looking back through some receipts, it appears the previous owner may have removed/replaced dash but not replaced the ducting when reassembling it all. I can hear what sounds like vacuum actuated vents etc working when I turn the heater control.
How easy is it to check and refit ducting if required? Do I need to pull the dash etc or can this be done bent double upside down, just like most other jobs on the Vette!!!
Le Mans Master
Joined: Jan 2006
Posts: 9,192
Likes: 27
From: Boca Raton Florida
Pull the dash and do it right and without a chiropracter bill. Without looking your not going to know what was done/undone or bubba'd.
Some things to do;
Check/fix/install hot water cutoff valve in the heater hose coming from the intake manifold to the firewall, this will stop the hot water from entering the heater core.
Fix/reinstall the ducts, they may have been disconnected or removed.
There is a paper on corvettefaq.com on C3 cocpit heat, get that and study it.
Close up any air leaks from the firewall.
Wrap the exhaust / Install heat shields
Install heat/sound proofing under the carpet
Lots of heat sources and fix's
Some things to do;
Check/fix/install hot water cutoff valve in the heater hose coming from the intake manifold to the firewall, this will stop the hot water from entering the heater core.
Fix/reinstall the ducts, they may have been disconnected or removed.
There is a paper on corvettefaq.com on C3 cocpit heat, get that and study it.
Close up any air leaks from the firewall.
Wrap the exhaust / Install heat shields
Install heat/sound proofing under the carpet
Lots of heat sources and fix's
Thread Starter
Melting Slicks
Joined: Oct 2005
Posts: 2,056
Likes: 8
From: Redruth Cornwall
Thanks for the tips, following them up as I type.
One question about the heater cut off valve though.
In previous old cars of mine, to stop hot water from entering the heater core ( usually because of a leak ) I installed a loop to basically just bypass the heater core and keep the coolant circulation correct.
Can I just install the cutoff in the pipe effectively stopping the flow without the need to install a complete loop?
One question about the heater cut off valve though.
In previous old cars of mine, to stop hot water from entering the heater core ( usually because of a leak ) I installed a loop to basically just bypass the heater core and keep the coolant circulation correct.
Can I just install the cutoff in the pipe effectively stopping the flow without the need to install a complete loop?
Le Mans Master
Joined: Jul 1999
Posts: 9,206
Likes: 17
From: Sewell NJ
