How hard does the heater blow? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

MrBlue · 10-12-2009, 07:12 AM

Greetings,
How hard should the heater blow? It does not seem to be moving much air. Could this mean the air side of the heater core is plugged up?
Thanks
MrBlue

cdowns · 10-12-2009, 07:28 AM

not uncommon that leaves mouse nests and 40years of crap plug things up for little to no air flo

**LockDoc** · 10-12-2009, 08:57 AM

-

..with cdowns. I just took the heater box out of the '69 and it was full of mouse nests. They also chewed holes in the plastic blower fan...

The bad thing is you have to pull the inner fender down to get to a couple of the bolts/screws to get it apart. If it is a non a/c you can try pulling the blower assembly out and vacuum out that area. To do that you have to remove the hood hinge on that side. If you remove the hood hinge be sure to mark around the top and bottom with a sharpie so you can get it back in the same place.... Nothings easy..

LockDoc

Hottrucks · 10-12-2009, 09:03 AM

or listen for the fan they wind up pretty good...if your not hearing it then maybe your heater fan relay is bad...

68gmsee · 10-12-2009, 10:00 AM

My two trucks don't move a lot of air either. Granted it's enough for the small cab but it's not like what you feel in cars or larger suvs. I think they are made specifically for smaller areas.

Another thing that may slow the fan down is the bushngs needing lubrication. Should be a post with a picture around somewhere where a member drilled a small hole through the enclosure to oil the fan.

69GMCLonghorn · 10-12-2009, 12:52 PM

There are 100 different things to check. The guys above have named off the major ones. I had a really bad problem getting mine grounded properly. At one point, I got pi**ed off and ran a huge gauge wire directly from the battery ground to the blower fan. That did the trick. (I later found a better ground closer to the fan, but that at least told me what the problem was).

Another thing to check is your switch. The stock switch is a 3 speed switch. Make sure you hear a difference in each "click". If not, it could be a switch issue.

turp mcspray · 10-12-2009, 02:07 PM

If your truck is a non a/c truck, switch to an a/c fan motor. It will move more air.

dhaymaker · 10-12-2009, 02:43 PM

With very few exceptions, virtually all my 1967 -1972 trucks have been big time air movers! If not, I first ensure the leaves, critters, etc. are cleaned out. Next thing to check is the fan motor. If you can hear it run, but you do not distinctly hear the different fan speeds, something is wrong. The primary culprits are the switch, the ground, or the fan motor itself is bad.

10-12-2009, 07:12 AM	#1
MrBlue Registered User Join Date: May 2009 Location: Laporte, IN Posts: 167	How hard does the heater blow? Greetings, How hard should the heater blow? It does not seem to be moving much air. Could this mean the air side of the heater core is plugged up? Thanks MrBlue __________________ MrBlue 72' C-10 350 TKO-600 Current Project 54' Ford F-100 Life Long Project

10-12-2009, 07:28 AM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: How hard does the heater blow? not uncommon that leaves mouse nests and 40years of crap plug things up for little to no air flo __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

10-12-2009, 08:57 AM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,818	Re: How hard does the heater blow? - ..with cdowns. I just took the heater box out of the '69 and it was full of mouse nests. They also chewed holes in the plastic blower fan... The bad thing is you have to pull the inner fender down to get to a couple of the bolts/screws to get it apart. If it is a non a/c you can try pulling the blower assembly out and vacuum out that area. To do that you have to remove the hood hinge on that side. If you remove the hood hinge be sure to mark around the top and bottom with a sharpie so you can get it back in the same place.... Nothings easy.. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

10-12-2009, 09:03 AM	#4
Hottrucks Redefining LowBudget Join Date: Mar 2009 Location: lebanon Cow Hampshire Posts: 4,538	Re: How hard does the heater blow? or listen for the fan they wind up pretty good...if your not hearing it then maybe your heater fan relay is bad... __________________ 1970 C10 CST fleetside 472 ....big dreams little cash... http://67-72chevytrucks.com/vboard/s...d.php?t=335721 SunShine Syndicate.. Mikes Sandwich Fair Run OCT 8th 2011 http://www.thesandwichfair.com/html/...auto_show.html

10-12-2009, 10:00 AM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: How hard does the heater blow? My two trucks don't move a lot of air either. Granted it's enough for the small cab but it's not like what you feel in cars or larger suvs. I think they are made specifically for smaller areas. Another thing that may slow the fan down is the bushngs needing lubrication. Should be a post with a picture around somewhere where a member drilled a small hole through the enclosure to oil the fan.

10-12-2009, 12:52 PM	#6
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: How hard does the heater blow? There are 100 different things to check. The guys above have named off the major ones. I had a really bad problem getting mine grounded properly. At one point, I got pi**ed off and ran a huge gauge wire directly from the battery ground to the blower fan. That did the trick. (I later found a better ground closer to the fan, but that at least told me what the problem was). Another thing to check is your switch. The stock switch is a 3 speed switch. Make sure you hear a difference in each "click". If not, it could be a switch issue.

10-12-2009, 02:07 PM	#7
turp mcspray Registered User Join Date: May 2007 Location: Rapid City South Dakota Posts: 2,359	Re: How hard does the heater blow? If your truck is a non a/c truck, switch to an a/c fan motor. It will move more air. __________________ Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299

10-12-2009, 02:43 PM	#8
dhaymaker Registered User Join Date: Jan 2006 Location: Peyton, CO Posts: 448	Re: How hard does the heater blow? With very few exceptions, virtually all my 1967 -1972 trucks have been big time air movers! If not, I first ensure the leaves, critters, etc. are cleaned out. Next thing to check is the fan motor. If you can hear it run, but you do not distinctly hear the different fan speeds, something is wrong. The primary culprits are the switch, the ground, or the fan motor itself is bad. __________________ don "The DRBMan" 2014 Audi A4 (The Wife's Daily Driver) 2017 HD Ultra (The Cruiser) 2003 HD Fatboy (The Ride) 2001 Chevy Suburban (Another back up!!) For the first time in forever, not a single 67-72 Chevy truck, Blazer, or Suburban on the property! Basically retired and getting the new Motorhome ready for some traveling. Doing a bit of work on the house getting it ready to sell! LOL!!



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