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heater only works on high

 
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Old 07-30-2008, 02:36 PM
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heater only works on high

my heater is loud like its vibrating kind of noise. and only works on high. but doesnt blow very hard. what do i do?
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Old 07-30-2008, 06:50 PM
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Re: heater only works on high

it might be ur heater core lines.... in the dead center under the windsheild if u dont kno where they r there is 2 lines right next to or underneath each other... they get coolat from ur radiator to ur heater core they could possibly not be getting coolant or the actual core can be broken... the core itself looks like a mini radiator. check the lines first its an easy fix.
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Old 07-30-2008, 07:24 PM
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Re: heater only works on high

i thought it was behind the glovebox
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Old 07-30-2008, 07:36 PM
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Re: heater only works on high

The core might be behind the glove box but he is talking about where the rubber hoses come thru the firewall into the passenger compartment of the car.

I read the post and its said the fan only comes on when you turn it to high? Plus it makes funny vibrating noises? Well I would check your lines to the heater core, then I would check that you have enough coolant in your car. Then I might look at the fan and motor itself. Thats a tuff one as I havn't experienced anything like that yet, (knock on wood) good luck hope you find a fix quickly
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Old 07-31-2008, 12:16 AM
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Re: heater only works on high

the heat is hot and the a/c is cold so i dont think it could be the heater core. but the fan just doesnt blow on anything but high. i think you guys got the idea but just making sure.
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Old 07-31-2008, 12:33 AM
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Re: heater only works on high

Sounds like its your blower motor going bad especially if your getting a rattling noise... If your heater core was bad you would have a coolant leak or cooling problem...

Is your motor not working at all on other settings? or can you hear the rattle start when you turn the fan on but not feel anything coming out of the vents until you put it on high? I ask because if your fan is turning on with all settings then im going to say without seeing hte car 95% sure its blower motor. However if your fan is only kicking on with the setting at high only then it could be a wiring problem also....
Keep in mind that even if the fan is kicking on you may not feel it because its very weak but still none the less it is getting a signal to blow air...
BUT because you said your getting a loud rattle from the blower then im very sure its your blower... but check those things out before you go and buy another blower and find out thats not it... You can also pull that motor and test it to make sure its faulty which would be a good idea...
I hope thats enough to get you started....
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Old 07-31-2008, 07:15 PM
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Re: heater only works on high

alright thanks ill try that. and yea it only works on high. the other settings do nothing its off til its on high
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Old 07-31-2008, 10:26 PM
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Re: heater only works on high

I have the same problem.
only works on high and i have a new heater core and motor. Are there any relays that might be bad???
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