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G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Heater don't works

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v8power
Wallyuph
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G3GM :: G3 Tech :: Engine & Driveline

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Heater don't works Empty Heater don't works

Post by v8power Tue Apr 09, 2013 5:17 am

Hi

I have a problem. My heater don't work sience i bought my Chevelle.

The Ventilation engine works. But the air is not warm.

I checked the inlet and oulet of the heating hoses. They are both equally warm. But not hot.

What do you think is my problem? Thermostat or heater valve?

Thanks a lot!


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Post by driveit Tue Apr 09, 2013 8:30 am

Welcome to the site. I am having a similar issue myself with no heat. Unfortunately my fan doesn't work as well. Good thing summer is comming!
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Post by Wallyuph Tue Apr 09, 2013 8:55 am

Was it sitting for awhile? My 73 had a huge mouse nest in it.
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Post by v8power Tue Apr 09, 2013 9:45 am

@ driveit
Do you have checked the heater fuse on the fusebox?

@Wallyuph
Mouse nest? LOL thats really funny Very Happy

No i don't have a mouse nest but thank you for you idea!
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Post by 77mali Tue Apr 09, 2013 9:52 am

Wallyuph wrote:Was it sitting for awhile? My 73 had a huge mouse nest in it.

X2, plus I had a nest in the cowl where the wiper mechanisms are.

The H-Valve & Thermostat are inexpensive & they're worth replacing anyway every once in a while. Check your antifreeze level & check it's potency- you may want to flush the system if it's old.



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Post by Mcarlo77 Tue Apr 09, 2013 10:35 am

Here in the Northland, whenever a car isn't putting out heat (and, the blower is working), the first item of suspect is the thermostat. That's assuming the coolant level is where it should be. As I understand it, the Heat/Water Valve should always be open unless you switch the Temp Control to A/C...which then closes it to prevent coolant from flowing to your heater core. As Mali states, both are easy and inexpensive to replace...and a good time to backflush the coolant through your heater core. Actually, it's very easy to test the Heat Valve by simply pulling a vacuum through the hose and determining that the insides move freely.
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Post by ant7377 Tue Apr 09, 2013 5:47 pm

Could be the cable for the heater door is not hooked up. How does the lever move? If with no resistance maybe its broken.
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Post by cees klumper Tue Apr 09, 2013 6:37 pm

On my car the cable was not attached to the heater door. Once I fixed that (and lubed and streightened the cable), presto, heat. Well, reasonable heat, not toasty.
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