a.c & stock heater firewall the same?
 

Will a ac heater unit fit in the firewall that had a stock non ac unit and vice versa on a 78 truck.It looks like the ac unit is larger on the firewall.I,m talking about the fan and box unit that bolts on the firewall in the engine compartment

Re: a.c & stock heater firewall the same?
 

I found a pic and the ac unit looks quite large,is there a plate to change from the ac unit to a non ac unit ?

Re: a.c & stock heater firewall the same?
 

The hole for the a/c trucks is different than the standard units but it is not hard to modify either way as the firewall is flat in that area.

Re: a.c & stock heater firewall the same?
 

the hole is in a different spot and is in a different shape, i put ac off a 79 on a 78, and the 78 did not have a/c previously.

i made a template off the a/c cab. layed it on the other cab, cut the whole bigger and filled in the rest, drilled some holes and mounted up the box

79 firewall

http://i178.photobucket.com/albums/w...r/P1070020.jpg

79 firewall with template

http://i178.photobucket.com/albums/w...r/P1070022.jpg

78 firewall after modification:

http://i178.photobucket.com/albums/w...r/P2170007.jpg

all painted

http://i178.photobucket.com/albums/w...r/P2190003.jpg

the box

http://i178.photobucket.com/albums/w...r/P2230008.jpg

Re: a.c & stock heater firewall the same?
 

Ok thanks,it just that a friend has a truck up north but he doesn,t want the ac [no use up there]and he will trade me for mine[and i need air down here in the summer]We were just wondering how they would inter change but it looks I have to do some cutting and he has to make a plate

Re: a.c & stock heater firewall the same?
 

Nicely done, and good input, too.

I like the note on your template...

;)

Re: a.c & stock heater firewall the same?
 

when there are other people in your shop things tend to disappear sometimes, and there was a 3 week period between making the template and cutting the cab