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No heat?

Brand new thermostat and water pump, little to no heat..?

No heat?

Postby jepwrote [OP] » Feb 05 2011, 11:00am

Hey guys! Just got a used 2000 Silverado, I love it. It looks great, and I got it running good. Just replaced the water pump and thermostat since the old one was bad. It was a successful job, the truck runs at a steady temperature at just below 210 and never over heats. My only problem is, I have little to no heat :(, sometimes it gets luke warm for a little bit then quickly goes back to cool air. This is definitely a problem since we are in the dead stretch of winter and i need it for defrost and just to stay warm! I have no idea what could be wrong, The thermostat and water pump were brand new parts, they were installed properly. Any help or suggestions would be greatly appreciated.

Also, one thing my buddy did was squeeze a tube located in the front of the engine as soon as you open the hood, it would cause HOT air to come through for about 10 seconds, then go back to cool/luke warm air.

Thanks in advanced!

-jep
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Re: No heat?

Postby Z15 » Feb 05 2011, 3:00pm

You most likely have air trapped in the system and an air pocket is blocking flow to the heater. You need to park the vehicle with the radiator cap and reservoir is at the highest point and then idle the motor with the cap loose or off to let the air purge. Eventually this should correct itself after several cold/warm cycles in the coolant.
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Re: No heat?

Postby NYsteve » Feb 05 2011, 4:42pm

Do you know if the heat worked before your repairs? It's possible that your heater core is plugged as well. They are usually pretty easy to flush out, but definitely try Z15's suggestion first.
Oil leak? What oil leak? That's just sweat from all that horsepower!
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Re: No heat?

Postby jepwrote [OP] » Feb 07 2011, 5:08pm

Another clue that may be the heater core is plugged is that one of the hoses coming out of the heater core is cold and the other one is warm. many people are telling me that they both should be warm, does this mean it does need to be flushed and is plugged?
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Re: No heat?

Postby Hartski » Feb 07 2011, 6:18pm

Yeah, that sounds like a heater core blockage.
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Re: No heat?

Postby jepics » Feb 07 2011, 7:22pm

one thing my buddy did was squeeze a tube located in the front of the engine as soon as you open the hood, it would cause HOT air to come through for about 10 seconds, then go back to cool/luke warm air.


This is the best indicator of your problem - because of excess air in the cooling system, the heater core is just not getting the flow it needs. If the heater core were blocked, squeezing a heater hose would not cause the heater to put out heat. The act of squeezing the heater hose temporarily overcame the air lock. Chck your radiator cap for proper function, and the overflow tube into the overflow tank - is there sufficient coolant in the overflow tank to cover the bottom of the overflow tube?
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Re: No heat?

Postby jepwrote [OP] » Feb 12 2011, 8:39pm

It was in fact a clogged heater core! Extremely easy to fix, just unhooked the hoses and used a hose to blow through the heater core until it came out steadily. Thank you so much guys! All your input helped to fix the problem. Definitely nice to have heat again, its pretty cold in upstate NY this time of year! :p
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Re: No heat?

Postby NYsteve » Feb 14 2011, 4:05am

Be sure to flush it through both ways until the water runs clear. If not, it may plug back up soon
Oil leak? What oil leak? That's just sweat from all that horsepower!
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Re: No heat?

Postby Marco21 » Feb 26 2011, 3:34am

NYsteve is right......

I had the same problem in my 97 camaro, I flushed it one way only and then after storing the car over the winter it clogged again. Just make sure you got it all.
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