a.c & stock heater firewall the same? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blazer2007 · 01-06-2011, 08:17 PM

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

blazer2007 · 01-06-2011, 08:35 PM

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 ?

80SPORT · 01-06-2011, 09:10 PM

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.

95 S_Trucker · 01-06-2011, 10:54 PM

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

79 firewall with template

78 firewall after modification:

all painted

the box

Keith Seymore · 01-07-2011, 03:26 PM

Quote:

Originally Posted by 95 S_Trucker

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

79 firewall with template

78 firewall after modification:

all painted

the box

Nicely done, and good input, too.

I like the note on your template...

95 S_Trucker · 01-07-2011, 07:20 PM

Quote:

Originally Posted by Keith Seymore

Nicely done, and good input, too.

I like the note on your template...

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

blazer2007 · 01-07-2011, 11:38 AM

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

01-06-2011, 08:17 PM	#1
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	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

01-06-2011, 08:35 PM	#2
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	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 ? Attached Images

01-06-2011, 09:10 PM	#3
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	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.

01-06-2011, 10:54 PM	#4
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,187	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 79 firewall with template 78 firewall after modification: all painted the box

01-07-2011, 11:38 AM	#7
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	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



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