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#1
10-17-2009, 04:56 PM
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Heater Problems
I have a 1987 Chevrolet Silverado with a 468 BB. The upper radiator hose is hot, but the lower one is cold. The heater hoses are also cold. I put a new thermostat in it and also flushed out the system with a garden hose and there are no restrictions. Any solutions to this problem?
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#2
10-17-2009, 06:41 PM
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Re: Heater Problems
Welcome to AF.
Please tell us what indications you had to ask this question. Is it overheating? What have you replaced prior to this issue? All the info you can give us will help us help you.
__________________
57 Chevy 210 65 Olds 442 Convertible (Another one sold) 75 GMC Vandura 3/4 Ton 1999 K2500 Old Body Style Suburban (Gone but not forgotten) 05 Dodge Ram 3500/5.9 Cummins 2012 Toyota FJ Cruiser
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#3
10-25-2009, 11:48 PM
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Re: Heater Problems
Quote:
__________________
10 hours away from John Deere master certified also master certified ASE tech. Exp. in both. Went to school for cars, wound up staying with Deere dealer for a while, so schooling there too. Also couple years exp in GM and some GM training Gave up wrenching for "Greener Pastures" Current job: RN 2010 Silverado Z71 5.3L 65xxx Wife's 2007 Suburban 1500 LTZ 5.3L 102xxx
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#4
10-26-2009, 09:21 AM
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Re: Heater Problems
Quote:
I would with the engine cold remove the radiator cap and continue to run engine heater set to max heat..as the engine warms you must see flow inside the radiator,,if not you must find out why...start by removing the thermostat then recheck for flow...if the coolant bubbles as its warming up then you got the head gasket/head cracked etc...
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#5
10-26-2009, 12:27 PM
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Re: Heater Problems
Seems like a cirulation issue, If you flushed everything and there is no heat to the heater hoses I would look at the water pump. Those hoses should heat up as the engine heats up.
__________________
ASE Master Certified before the age of 20 Current Cars: 2001 Chevy Silverado 1500 Z71 5.3L 1996 Acura Integra LS B18 1.8L Past Cars: 1990 Buick Estate Wagon 5.0L 1987 Chevy S10 2.5L Tec Four 1995 Pontiac Grand Am 2.3 Quad 4 1996 Jeep Grand Cherokee Limited 5.2L AWD 1991 Ford Tempo L 2.3L 1992 Buick LeSabre 3.8L 1997 Buick Century 3.1L 1996 Lumina APV GT 3.4L 2006 Ford Escape 3.0L XLT
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#6
10-26-2009, 09:57 PM
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Re: Heater Problems
I'm with Jcat on an issue..
In MY experience this is because there is a huge air bubble in the heater core. Try his recommendation of cold engine... remove radiator cap and start engine. Let it idle and get warm and hopefully with an unpressurized system the heater core will 'burp' itself. If this doesn't work.. with a cold engine remove thermostat then use vice grips to pinch off the the inlet/outlet hoses for the heater core. un-fasten whichever end of the outlet heater core return hose is higher.. then undo the intake vice grip allowing water pressure IN TO the heater core. Lastly remove the vice grip on the outlet side and the air should begin to evacuate slowly. Good Luck.
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