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#1 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Heater sucks!!!
It has been getting pretty cold around here lately, the last couple days the high temp has gotten clear into the low 20s. My heater seemed like it worked fine in the fall but as I was driving on the freeway in some thick fog it was freezing to the windshield and the defrost vents felt like they were blowing out 60 degree air. I was still pretty chilly despite having an arctic carhartt jacket on.
I would not think the cold air would keep the coolant THAT cold, does this sound more like a nearly plugged up heater core?
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#2 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
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Re: Heater sucks!!!
I would think there is an issue as you should be getting heat...
Ideas fellow board members?
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#3 |
Registered User
Join Date: Sep 2011
Location: San Jose, California
Posts: 784
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Re: Heater sucks!!!
Might want to take a look at the firewall, too. Plugging up all the air leaks makes a big difference.
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#4 |
Registered User
Join Date: Nov 2010
Location: Goodman,Mo
Posts: 155
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Re: Heater sucks!!!
Sounds like the thermostat is stuck open. Engine is not getting up temp. Replace the thermostat and see if it helps.
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#5 |
Registered User
Join Date: Dec 2008
Location: Jackson, MS
Posts: 373
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Re: Heater sucks!!!
I was thinking a stuck thermostat also, or nor thermostat, or a low temp. thermostat. I like the plugging the holes idea also.
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#6 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Heater sucks!!!
Hadn't thought about the t-stat, that makes sense though.
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#7 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Heater sucks!!!
Could also be a clogged heater core.Take the hoses loose and run the water hose thru it.Flush both ways.Especially if it's a newer replacement.For some reason they have made the lines thru them smaller and they clog easier.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#8 |
Registered User
Join Date: Nov 2010
Location: Goodman,Mo
Posts: 155
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Re: Heater sucks!!!
Yep...less than 20 bucks and less than 20 min.. first place I would start....IMO
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Heater sucks!!!
i'd take the blower motor out and check to seee if the phlenum is clogged with 40 years of crap causing no air circulation
cost is $20 less than that $20// i've found time with no money is better than money alot of times when solving problems
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#10 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: Heater sucks!!!
im with cdowns
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#11 |
Registered User
Join Date: Jun 2010
Location: San Diego Co.
Posts: 1,162
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Re: Heater sucks!!!
This certainly won't hurt, but it won't help it get hotter. How is the airflow? If you can feel some volume coming through, it's not the blower. I'm inclined to think more of a core blockage or the thermostat.
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#12 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Heater sucks!!!
If it sucks then the motor is running backwards.
![]() sorry J/K First thing is check the air flow from the vents. Then check the lever on the heat door control for free travel no binding. Then check the top and bottom heater hoses after the engine warms up for equal temperature both warm to hot. If you have AC then the control valve might be stuck on the inlet hose to the heater core.
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#13 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Heater sucks!!!
Air volume is decent, I'd say similar to what my chevelle puts out. Still what I would consider inadequate, but I think thats about as good as these ol things get.
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#14 |
Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
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Re: Heater sucks!!!
If your engine isn't getting up to operating temp, try blocking half of the radiator with a piece of cardboard. Watch your temp gauge though. I've got a 160 t-stat in mine, but didn't change it before winter. Now my truck barely warms up. The cardboard works. (Then I noticed all the big-rigs with the snap on covers over the front of their trucks.)
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#15 | |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Heater sucks!!!
Quote:
These trucks have HUGE heater cores. I've got a little laser-pointer-thermometer-thingy-mabobber and it says my output air temp is 145* on a 30* day. I have a 180* thermostat. |
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#16 |
Registered User
Join Date: Oct 2006
Location: denver nc
Posts: 97
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Re: Heater sucks!!!
Is the air comeing out warm at a low fan speed and then cools when you turn the fan to high? If so the core is clogged and the air is cooling it faster than the water can move though it. Mine was doing this and I removed the hoses form the motor and took a hose and blew through it backwards. At first hardly any water would go through. Then some grit and rust started coming out and I could tell The flow was getting better. Heats better now.
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#17 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Heater sucks!!!
It must be in the thermostat. You're not "making" heat. These trucks have heaters that are second to none. They put out more heat than you will ever need. If the heater core was clogged you'd feel a hot heater hose going in and a cooler one going out. If the plenum was clogged you'd still have the heat,just less air bowing through. In fact,you'd have a very hot heater. I never wear a jacket while in my truck and it's rare the fan is ever blowing more than low. It only goes on high to deice when I first start it up or to defog when I get in the truck wet. Then,the temp is either set down or if it's on hot to dry the air I need to open the wing vent or crack a window. A proper working heater will make you sweat like a pig with fan on high and temperature set on hot.
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#18 |
Junior Member
![]() Join Date: Mar 2005
Location: Wilmington DE
Posts: 218
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Re: Heater sucks!!!
This is what I found in mine.
http://67-72chevytrucks.com/vboard/s...d.php?t=396843
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#19 |
Registered User
Join Date: Nov 2010
Location: Goodman,Mo
Posts: 155
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Re: Heater sucks!!!
Webfoot,what did you find? Would sure like to know.
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#20 |
Registered User
![]() Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Heater sucks!!!
Haven't played with it yet. We haven't been above freezing for about 2 weeks now so my motivation to go out and work on it is low. I will update the thread when I find out.
__________________
Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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#21 |
Registered User
![]() Join Date: Feb 2001
Location: East Central, MO
Posts: 11,336
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Re: Heater sucks!!!
Low water/anti freeze mixture. Make sure it has plenty of water in it. After I redid my heater with new door rubber it would actually run you out.
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