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#1 |
Registered User
Join Date: Apr 2010
Location: Tucson, Arizona
Posts: 157
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Help! Heater Box overheating?
Hows it going everyone? I need help with something. I've noticed that after I park my truck I hear a bubbling sound like boiling water coming from the passenger side behind the dash. I'm thinking it's my heater box, but I dont know what I need to do to fix it? Any help would be appreciated, thanks!
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#2 |
TOTY 2006
![]() Join Date: Dec 1999
Location: Magalia CA USA
Posts: 2,270
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Re: Help! Heater Box overheating?
that would mean you have a leak in your cooling system. Check your heater hoses (in the engine compartment), and if you don't see a leak (look for white build up, calcium) then its possible that your heater core is bad and needs to be replaced.
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#3 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Help! Heater Box overheating?
You have a leak as john said, core or hose. Not to bad to fix, but will have to drop your inner fender if a non air truck.
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#4 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Help! Heater Box overheating?
Find a cooling system pressure tester and pressurize your cooling system. If you can't borrow one, then a service station or garage should have one and can pressurize it for you. When I was at Sears Auto Center, we also had one so Sears, or a Firestone or Goodyear store are other possibilities.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#5 |
BOHICA
Join Date: Mar 2008
Location: Stewartville, MN
Posts: 440
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Re: Help! Heater Box overheating?
I had a 91 chevy that had the same sound. Not constant, but occasionally. When I changed the engine, apparently I got an air bubble in the heater core. I tried everything to get it out, but nothing worked. I drove it like that for 3 years until I sold it.
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Trying to save someone from their own stupidity is like teaching a pig to dance. It is a waste of your time, and it annoys the pig! |
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#6 |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Help! Heater Box overheating?
I agree it sounds like you will have to open the heater box up and find out if your core is leaking, doing a pressure test is a good place to start, if there is a leak it won't hold pressure, then you would have to pinpoint the leak
Also make sure you have the water hose from your intake manafold (outlet) port routed to your lower heater (inlet) port? the core is suppost to fill from the bottom to the top to purge the air out of the heater core the top shopuld go ether to your radiator if you have the connection, or back to the port on the waterpump..
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#7 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Look in the passenger side floor board and see if there is any sign's of leakage in the floor under the carpet or floor matting.
Ok, then if not look out in the engine bay under the passenger side and see if you see any signs of it. If you can't find anything wet. Take the bottom and top heater hoses off and put your water hose on the bottom one and turn it on and see if it's blocked up. If not then it's a hose leak somewhere. ![]() ![]()
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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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#8 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: Help! Heater Box overheating?
Definitely check for leaks first. Now after you don't find any......
When you shut down an engine, water in contact with hot spots can start to boil locally, since there is no longer any circulation to carry away the heat. This is not harmful in itself. However, the vapor bubbles created by the boiling are lighter than water and want to migrate to high points in the cooling system, which just happen to include the heater core. Ray |
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