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11-08-2002, 06:21 PM
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#1 |
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WHYBYNU when old will do
Join Date: Feb 2002
Location: Hot Springs, AR.
Posts: 646
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Heater blows !
My heater won't blow hot air it's been working fine and just quit blowing hot air not even warm air. I've checked all I know to check. Cable connections seem to be hooked up and working,the flapper valve seems to be opening and closing. The fan blows hard and the A/C works fine. Anybody have any tips or advice ? The heater core has not leaked anywhere so I assume it's ok ..
Thanks John
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71 Cheyenne super 2 tone green and white ZZ6 - Th350 4/6 drop 20x8.5 / 20x10 Billet Specialties |
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11-08-2002, 06:29 PM
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#2 |
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Longtime Member
Join Date: Oct 2002
Location: Over Yonder (DFW)
Posts: 171
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The heater core doesn't have to leak to mean there is something wrong with it. It sometimes becomes clogged. Try flushing it if you can. Good luck. It sucks when you're heater doesn't work.
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11-08-2002, 07:09 PM
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Thats the Hillbilly way
Join Date: Jul 2001
Location: Torrance,Ca
Posts: 5,979
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If you have Air ,check the heater vacuum control valve , one quick check is when the engine is Hot see is there is a difference in Temp by feeling the inlet heater hose ,and the outlet hose coming from the heater core ,if the outlet hose is cooler going to the valve ,mostlikely the valve is bad.
Good luck
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BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , |
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11-08-2002, 07:21 PM
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#4 |
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Registered User
Join Date: Sep 2002
Location: Austin,Tx
Posts: 327
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I know of a few times that happened to me and it ended up being real low on coolant.
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'68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851 |
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11-08-2002, 09:27 PM
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#5 |
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huh?
 
Join Date: May 2000
Location: Washington, Illinois
Posts: 5,690
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Thermostat?
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Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay |
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11-08-2002, 09:32 PM
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Quote:
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11-09-2002, 12:12 AM
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#7 |
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Registered User
Join Date: Sep 2002
Location: Austin,Tx
Posts: 327
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Doh ! lol
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'68 Fleet LWB orig 307 .030 over GM Hei/w Accel Super coil orig. stock TH 400. _______________________ “What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” Albert Pine English author d.1851 |
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11-09-2002, 09:47 AM
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#8 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Heat
It could be a couple of things as stated above.
1. Low coolant. 2. Vacuume valve not opening. 3. Thermastat not shuting and letting water temp to build. Have you had any other problems with it lately, it could even be a water pump going bad and not pumping the coolant through the system, highly unlikely but possible, if it were you would notice the engine temp. rising in less it's already got cold enough for it to keep the engine from over heating, it would act like a thermastat problem. Hope this helps
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71  Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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11-09-2002, 11:39 AM
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#9 |
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WHYBYNU when old will do
Join Date: Feb 2002
Location: Hot Springs, AR.
Posts: 646
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Thanks guys! The heater valve is only a year old not saying it's not bad though and the stat is 2 months old . I just flushed the rad and topped it off, coolant level was right on before I drained it. The truck has not been running hot so I don't think it's the water pump, and the hoses are hot to the touch after driving so it could be the heater core gone bad. Thanks guys for the GREAT TIPS !! I'll keep testing ( replacing ) things till it's fixed. I'll keep you posted
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71 Cheyenne super 2 tone green and white ZZ6 - Th350 4/6 drop 20x8.5 / 20x10 Billet Specialties |
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11-09-2002, 12:18 PM
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#10 |
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English Chevy Owner
Join Date: May 2002
Location: Shropshire, UK/ Lot, France
Posts: 1,848
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If it happened after you emptied and refilled the system could be an airlock in the heater core.
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Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission |
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11-09-2002, 12:23 PM
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#11 | |
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Account Suspended
Join Date: Oct 2002
Location: Olathe, KS
Posts: 2,300
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Quote:
If both are hot, you have a blend door problem. Air is not being passed through the heater core! Double check the cable's leading to the blend door, could even be a broken door (rod seperated from the metal door). |
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11-09-2002, 07:03 PM
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#12 |
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Account Suspended
Join Date: Jan 2000
Location: Woodstock, IL
Posts: 7,020
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I would back flush the heater core! I did that to my 87 burb, when I had no heat, you should have seen the crud come out of that thing.
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11-09-2002, 09:09 PM
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#13 |
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WHYBYNU when old will do
Join Date: Feb 2002
Location: Hot Springs, AR.
Posts: 646
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The heater quit before I flushed the rad and the level was full before I drained it. The hose going to the heater valve is hot after running and the heater return line is warm to the touch. The blending door opens and closes properly checked it Friday. I think I'm going to flush the core and see what comes out..
THANKS JOHN
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71 Cheyenne super 2 tone green and white ZZ6 - Th350 4/6 drop 20x8.5 / 20x10 Billet Specialties |
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11-09-2002, 09:31 PM
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#14 |
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Thats the Hillbilly way
Join Date: Jul 2001
Location: Torrance,Ca
Posts: 5,979
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John , You might also want to make sure you have Vacuum at the heater valve , also I have bypassed the valve with a4" piece of 1/2"copper pipe to trouble shoot problems with the heater.
__________________
BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen , |
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