Heater System Upgrades.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

elks · 12-14-2015, 06:30 PM

For years my system has seemed a little weak and barely able to keep frost off wundows etc. The heater core finally started leaking and is going to need replaced.

While I am in there I want to do all I can to make the blazer warmer for my winter hunting etc. So is there a good existing thread? Or atleast a list of thing to fix and repair?

It is a 1972 Blazer without A/C.

Thanks

cleszkie · 12-14-2015, 09:12 PM

Chances are that heater core had some buildup in it too. A new heater core with good coolant flow should give a little more heat. You might also consider going to a hotter thermostat. In the winter, this will allow the water temps to get higher before the thermostat begins to open. The result is hotter water in the heater core and more heat. Other than that, I would suggest some insulation of some sort on the floors, in the doors, and on the inside of the bed sides to keep the heat in and cold out.

BobbyK · 12-21-2015, 10:04 PM

Here's a link to the pic's I took while rebuilding my a/c system. I tore apart everything and rebuilt it all including the air box.
Take a look. Maybe the pics will help.

http://public.fotki.com/blazbk/blaze...d_of_ac_syste/

.

themb2g · 12-22-2015, 12:42 AM

I took my heater out and replaced it with a vintage air. It worked well when I pulled it out a few years ago, if you pay for shipping its yours

dennis7222 · 12-26-2015, 05:54 PM

In my 72 Blazer, I put a blower motor out of a truck that had air conditioning. Now it blows my brains out !

Sacramento70 · 12-27-2015, 10:30 PM

Quote:

Originally Posted by dennis7222

In my 72 Blazer, I put a blower motor out of a truck that had air conditioning. Now it blows my brains out !

Are they the same size and fitment or did you have to customize the fan? Any noticeable differences between standard blazer fan Vs. A/C fan?

dennis7222 · 12-28-2015, 05:11 PM

YEP, they are exactly the same, all you have to do is swap them out, but I think that I had to take the fender well out to get to it.

Sacramento70 · 01-26-2016, 09:11 PM

Nice...its it your opinion that the A/C motor blows harder because its an A/C motor fan or is it just that the fan motor you put in was a bit newer and in better shape?

pound41 · 01-27-2016, 11:12 AM

Most blazer I have been in with a new core in them will run you out of the front seats problem always has been pushing the air to the back

12-14-2015, 06:30 PM	#1
elks Registered User Join Date: Mar 2009 Location: NW, Colorado Posts: 285	Heater System Upgrades.... For years my system has seemed a little weak and barely able to keep frost off wundows etc. The heater core finally started leaking and is going to need replaced. While I am in there I want to do all I can to make the blazer warmer for my winter hunting etc. So is there a good existing thread? Or atleast a list of thing to fix and repair? It is a 1972 Blazer without A/C. Thanks __________________ Confidence is the feeling we have before we fully comprehend the situation

12-14-2015, 09:12 PM	#2
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: Heater System Upgrades.... Chances are that heater core had some buildup in it too. A new heater core with good coolant flow should give a little more heat. You might also consider going to a hotter thermostat. In the winter, this will allow the water temps to get higher before the thermostat begins to open. The result is hotter water in the heater core and more heat. Other than that, I would suggest some insulation of some sort on the floors, in the doors, and on the inside of the bed sides to keep the heat in and cold out.

12-21-2015, 10:04 PM	#3
BobbyK Registered User Join Date: May 2000 Location: Petrolia,Ontario,Canada but working in Port Huron,Mi. Posts: 1,772	Re: Heater System Upgrades.... Here's a link to the pic's I took while rebuilding my a/c system. I tore apart everything and rebuilt it all including the air box. Take a look. Maybe the pics will help. http://public.fotki.com/blazbk/blaze...d_of_ac_syste/ . __________________ 71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE

12-22-2015, 12:42 AM	#4
themb2g Registered User Join Date: Jul 2010 Location: Portland, Oregon Posts: 411	Re: Heater System Upgrades.... I took my heater out and replaced it with a vintage air. It worked well when I pulled it out a few years ago, if you pay for shipping its yours __________________ Check out my build: 1972 LQ4 Swap http://67-72chevytrucks.com/vboard/s...=1#post5427693

12-26-2015, 05:54 PM	#5
dennis7222 Registered User Join Date: Jan 2014 Location: Roachdale IN Posts: 51	Re: Heater System Upgrades.... In my 72 Blazer, I put a blower motor out of a truck that had air conditioning. Now it blows my brains out !

12-28-2015, 05:11 PM	#7
dennis7222 Registered User Join Date: Jan 2014 Location: Roachdale IN Posts: 51	Re: Heater System Upgrades.... YEP, they are exactly the same, all you have to do is swap them out, but I think that I had to take the fender well out to get to it.

01-26-2016, 09:11 PM	#8
Sacramento70 Blazer Fanatic Join Date: May 2009 Location: Sacramento, ca Posts: 249	Re: Heater System Upgrades.... Nice...its it your opinion that the A/C motor blows harder because its an A/C motor fan or is it just that the fan motor you put in was a bit newer and in better shape? __________________ 1970 Chevy blazer

01-27-2016, 11:12 AM	#9
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,268	Re: Heater System Upgrades.... Most blazer I have been in with a new core in them will run you out of the front seats problem always has been pushing the air to the back



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