flushed heater core, still no heat
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flushed heater core, still no heat - 1/25/2007 5:09:07 PM
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woodsballr
Posts: 211
Joined: 1/6/2007
Status: offline
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ok guys i recently lost heat in my blazer. hadnt needed it for a while so i didnt notice but last week it snowed and iced so i needed heat. lo and behold NO HEAT! needless to say i was thrilled. i read the last post on this and flushed my heater core, took the hose to the radiator off at the radiator and the other hose off where it comes thru the firewall and then put a section off garden hose on that pipe. i put a nozzle on the hose to get a smaller stream of water with more pressure and ran it thru both hoses, a little bit of coolant came out, most came out when i took the hose of the radiator, and then just water came out. i figured ok that was easy. reattached the hoses, put the coolant back in, i had drained the radiator past the level where it would come out so it wouldnt come out, and cranked it up. before i lost my heat it would take about 10 minutes or so to heat up good on cold mornings when i needed it so i let it run for about 15 minutes. it was the same as before, just barely warm, and its 45 degrees outside and my hand was wet so... go figure. anyone have any ideas cuz its goin down to the teens tonight and it has been and will be cold for a while so i could really use it.
any help would really be appreciated.
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1985 GMC High Sierra 1500 w/a 5.7L V8 + a 4-barrel carb.
~~"Live like you ain't afraid to die"~~the late, great Chris LeDoux
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RE: flushed heater core, still no heat - 1/25/2007 5:11:13 PM
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Mapoftazifosho
Posts: 83
Joined: 1/1/2007
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replace the heater core
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RE: flushed heater core, still no heat - 1/25/2007 5:46:41 PM
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blazinwoody
Posts: 36
Joined: 1/5/2007
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I'm pretty sure you don't have to remove any radiator hoses. The two hoses going into the firewall are what lead to the heater core. I was going to flush my core but I knew I need another one because it was leaking. It was a pain but well worth it. Now try flushing the to tubes going to the heater core and see if that works.
oh... is your engine heating up to the correct temp?
< Message edited by blazinwoody -- 1/25/2007 5:48:44 PM >
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1999 LT V6 Vortec 4WD Chevy Blazer
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RE: flushed heater core, still no heat - 1/25/2007 6:33:32 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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Ok, first off, to just blindly recommend changing the heater core is wrong. Sorry...
After driving for 10-15 minutes, your engine should be up to full operating temperature. After driving, how hot is the upper radiator hose? If you haven't checked it, then please do. It is possible that your t-stat has failed open and it isn't allowing your engine to come up to temp. It is just allowing the coolant to circulate and because it is so cold outside, it is staying very cool.
Anytime something is amiss with a cooling system, I recommend that the t-stat and radiator cap be changed. The Stant super stat and Stant safety cap come out to be roughly $18 total and both the stat and cap are crucial parts in the cooling system.
Now, when you flushed your heater core, did water flow through it good? Since you didn't remove both of the hoses, you really don't know if any junk floated out or if the coolant was a crappy color when it came out of the core...
Good luck and let us know how things go.
*EDIT* Oh and have a look at the Image Posting link in my signature for details on posting images...
< Message edited by swartlkk -- 1/25/2007 6:35:06 PM >
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Kyle-
04 Rainier
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RE: flushed heater core, still no heat - 1/25/2007 7:00:46 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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Oh ok, I missed that part. How did the fluid look when it was coming out of the drain hose?
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Kyle-
04 Rainier
My Restoration Projects
Please Do Not PM for Tech Help
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RE: flushed heater core, still no heat - 1/25/2007 11:35:17 PM
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Hanr3
Wheels & Tire Moderator
Posts: 3482
Joined: 5/11/2005
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Sounds like the thermostat is stuck open. It will allow the coolant to circulate, but never get hot. Your temp guage should be around 195 or so. If the guage is moving at all, I dont think its broke. Could be a loose wire. However, I recommend you replace the thermostat and the radiator cap. Mine cost me less then $15 for both and took almost 20 minutes. 15 of which was drinking a beer and farting around with the throttle bracket I needed to move.
My temp was around 150, changed the thermostat and rad cap and my temp went up to 195, and the heat will cook you out of the cab. The high today was 20, minus the windchill. I leave my HVAC temp setting on halfway and the 1st or 2nd fan speed.
By the way, if your getting fluid out of both the hoses on the firewall, your heater core is not plugged.
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"Some people spend an entire lifetime wondering if they made a difference.
The Marines don't have that problem."
-President Ronald Reagan
'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
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RE: flushed heater core, still no heat - 1/26/2007 12:06:28 AM
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MNHawk
Posts: 451
Joined: 10/20/2006
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I had a simular issue with NO heat. What it turned out to be was a control valve inside the truck for the heat/AC system that was not opening to allow the blower to blow threw the heater core. So I had no heat. Both heater core hoses where hot to the touch, so I knew the coolent was passing threw the heater core. Fixed the control valve and wow got heat now.
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74 W200 4x4 360/727/NP205 D44/D60
1981 C-20 Suburban Full Size 4x4 350 4sp manual (newest toy)
91 Honda Accord (daily Driver)
1979 Ford LGT 125
2005 JD L130
95 Blazer 4 door 4x4 4.3 lt vin W(parked selling or parting out)
93 S10 Blazer 4dr 4.
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RE: flushed heater core, still no heat - 1/26/2007 7:57:25 PM
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thegr81
Posts: 2621
Joined: 1/16/2007
From: PHOENIX,AZ
Status: offline
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yea change the control valve and if that doesn't work then ur problem might be something i ran into check your oil is it milky if it is then u have got blow by in your intake manifold and you will have to replace your gaskets with felpro pinto gaskets. just wanted to cover all basis.
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2001 2wd 4.3 vortec v6
"I'm not fat, I'm a minitrucker"
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RE: flushed heater core, still no heat - 1/28/2007 5:17:11 PM
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mikeemo
Posts: 4
Joined: 1/18/2007
Status: offline
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A friend of mine with a 96 had a problem like that after he flushed his cooling system. I think it had something to do with air in the lines. He said the system had to be bled. I mentioned that I planned to change the thermostat in my truck and he told me that I might have to do that when Im finished. Could you be having the same problem ??
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