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#1 |
Senior Member
![]() Join Date: Feb 2008
Location: Denver, CO
Posts: 252
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Heater Box Noise
When my thermostat opens after my truck warms up, you can hear the water circulating through the heater box. For about 30 seconds, it is very noisy like two squirrels scrambling to get out! Can anyone lend some insight to what is happening and how to fix? Thanks.
Joel |
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#2 |
Son of a gun
Join Date: Jan 2007
Location: Hot Springs, Arkansas
Posts: 1,636
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Re: Heater Box Noise
you might need a little more water in your radiator. Have you chacked the level after the themostat opens?
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Bill BEATERS ARE NEATER Last edited by Bus Ted Knuckle; 11-23-2008 at 11:58 AM. |
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#3 | |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Heater Box Noise
Quote:
With the engine cold, take the cap off the radiator, put a catch pan under the open end of the radiator and start the truck. Let the engine warm up. Once you see a good, continuous flow coming through the radiator, fill it up to the top and replace the cap. I suspect the noise you are hearing is a slug of air that is trapped in the system. Burping it should make the noise go away.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#4 |
Still livin the "dream" in '54
Join Date: Nov 2006
Location: Tucson, AZ
Posts: 2,656
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Re: Heater Box Noise
Have you checked the box for squirrels???
Don
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Current build. 1954 Chevrolet 3800 "Ella" SOLD! My '67 stepper "Tangerine Dream" "Anything worth doing is worth doing right" James Dean “When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.” Sherlock Holmes "There is no spoon." Neo |
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#5 | |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Heater Box Noise
Quote:
Is this with the fan off and only after it warms up? Also, does it make the noise without opening up the heater/fan control lever? Could be a loose squirrel cage, motor, heat control valve, restriction in the heater or the mounting is loose. |
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#6 |
Senior Member
![]() Join Date: Feb 2008
Location: Denver, CO
Posts: 252
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Re: Heater Box Noise
Thanks everyone for the immediate comments. It sounds a lot like a trapped air bubble. I am going to try and "burp" the system and see if that gets rid of it. I will let you know how it goes. Thanks again for the help.
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#8 | |
Son of a gun
Join Date: Jan 2007
Location: Hot Springs, Arkansas
Posts: 1,636
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Re: Heater Box Noise
Quote:
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