Drop 15lbs off your heat and still keep it...
Drop 15lbs off your heat and still keep it... I am sure a thread has been made on this but i thought i would help someone else out who wants to shed some weight and also still keep their heat.
With this setup it uses a home made block off plate for the engine bay which cleans it up a ton. So much easier to work in there now.
I was dropping a bunch of weight out of my car and since the dash was going to be pulled i decided to mod the heat box.
I junked all the plastic/fiberglass that was sticking in the engine bay and cut/grinded it all full with the firewall. Since the hvac air is run through the engine bay a port needs to be cut and sealed near the blower to allow the air to travel properly though the heater core. I ditched all the controls/levers that distribute air to the vents using the intake vacuum. The blend door is still function on this setup and you can route as many lines as you like to where you want. I decided that since 90% of the time i use defrost/feet that is where i would setup my system to run.
An aluminum plate was made to seal off the system near the blend door. Pop rivets and silicone hold it in place. 1" PVC stubs were used along with sump pump hose that was 8 or so dollars at lowes for 24'. They both are a perfect fit. The line were then ran and trimmed to length and held in place with zip ties. Also not that the heater thermo was relocated into the loop around portion of the heater core cover. It sits perfect in there.
I am sure there is some questions but i figured i would make a brief write up and let the pictures answer alot of the questions.
Oh and it blows hot as hell just likes stock
With this setup it uses a home made block off plate for the engine bay which cleans it up a ton. So much easier to work in there now.
I was dropping a bunch of weight out of my car and since the dash was going to be pulled i decided to mod the heat box.
I junked all the plastic/fiberglass that was sticking in the engine bay and cut/grinded it all full with the firewall. Since the hvac air is run through the engine bay a port needs to be cut and sealed near the blower to allow the air to travel properly though the heater core. I ditched all the controls/levers that distribute air to the vents using the intake vacuum. The blend door is still function on this setup and you can route as many lines as you like to where you want. I decided that since 90% of the time i use defrost/feet that is where i would setup my system to run.
An aluminum plate was made to seal off the system near the blend door. Pop rivets and silicone hold it in place. 1" PVC stubs were used along with sump pump hose that was 8 or so dollars at lowes for 24'. They both are a perfect fit. The line were then ran and trimmed to length and held in place with zip ties. Also not that the heater thermo was relocated into the loop around portion of the heater core cover. It sits perfect in there.
I am sure there is some questions but i figured i would make a brief write up and let the pictures answer alot of the questions.
Oh and it blows hot as hell just likes stock
Last edited by chrs1313; Oct 24, 2010 at 08:34 PM.
great writeup chris, i really like the idea, and the hoses for the feet when they freeze wearing shoes standing in the snow drifts brushing the snow off the car, i miss the warm air. i made the stock fan to just blow up thu the dash, that works fine for driving the car in rain, and warming the car up, but not that nice.
On The Tree
Joined: May 2008
Posts: 124
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Nice work, I just ditched the ac system in my 93 since it hasn't worked since I bought it.
I was looking into removing the HVAC box on the passenger side firewall but it just looked so tight in there that I didn't see how I would do it with the motor in the car. Any ideas or suggestions? Can it all come out through the interior if I pull the dash?
I was looking into removing the HVAC box on the passenger side firewall but it just looked so tight in there that I didn't see how I would do it with the motor in the car. Any ideas or suggestions? Can it all come out through the interior if I pull the dash?
yup that is how it comes out...I was dropping some weight behind the dash so figured it was time to pull the heater box...there are bolts on both side so you will need to remove some from the engine bay and some from inside the car...it is definitely worth it...takes some time to pull and modify but dropping 15lbs and still have heat plus extra room in the engine bay is a plus, plus...
Chris
Chris
great writeup chris, i really like the idea, and the hoses for the feet when they freeze wearing shoes standing in the snow drifts brushing the snow off the car, i miss the warm air. i made the stock fan to just blow up thu the dash, that works fine for driving the car in rain, and warming the car up, but not that nice.
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it works really good we have been planing to do this for some time it just took both of us Ripping into it one night. 
GLD Free racing weekend!!! I'll be there since I have a place 20 minutes away on Lake Geneva. Then next weekend for the MFBA rental.
not sure what you mean all the vacuum lines can be removed since it doesn't have the boosters anymore to control where the air is directed...the blend door is still functional though...hvac is still plugged in so it know when it is turned onto heat...so all the function for heat just turn it on...
hope that makes some sense...
Chris
hope that makes some sense...
Chris
