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Old 03-16-2011, 03:24 PM   #1
A Star Ride
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Default No heat 2004 Avalanche

I know this isn't motorcycle related, but I consider yall my tech department for all things mechanical and am glad for the help provided here in the past on several issues.
Anyway, I have a 2004 Chevy Avalanche 1500 and the heat only works intermittantly regardless of how long the engine has been running. I do know I have a water pump leak, but it (coolant) all doesn't leak out, my engine temp gauge never reads high and my coolant level (per the puke tank) is just below the "add" line when at it's lowest point. If it matters this vehicle has the fully pressurized system meaning the overflow is pressured as a typical radiator would be, and the only fill cap is on the overflow tank, (no radiator cap). Is it likely that the only reason I'm not getting heat is due to the coolant level being so low that the heater core isn't getting any (hot) coolant circulated throught it to provide cabin heat? And the only reason I'm not overheating the engine is because it is so cold outside & the ambient air temp is the only thing saving my truck and I need to get offline & do a water pump gasket before the weather gets any warmer?
Thanks in advance for any feedback anyone may have to offer. I'm pretty sure the Avalanche, Silverado, Tahoe & Suburban are the same beyond the sheetmetal, but not sure on that.
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Old 03-16-2011, 04:00 PM   #2
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You've hit the press right on the platen, as to the heat-problem.

Get that F-Bomb'n water pump fixed, before you overheat the engine and warp a cylinder-head! It only takes simple hand-tools! Everything's gasketed with "O"-Rings nowadays, too. Makes it easy. A new water-pump is probably less than $150. A new engine; probably $4500.

I bet it could be done in under 4 hours, even done by a non-mechanic-type with only rudimentary skills. If I lived closer, I'd help you with it.

The hard part will be replacing the coolant (which you should flush-the block anyway when you open it up); getting all the air out of the system may take a bit of work, but the procedure should be outlined somewhere on the web.

Buy the premix-coolant, too. It's just easier to do, and they use distilled or at a minimum deionized water in that stuff, and not ordinary tap-water. No problems with radiator-calcification!
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Old 03-16-2011, 05:47 PM   #3
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Now that is a red-neckin pick-em-up truck!
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Old 03-16-2011, 08:54 PM   #4
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Thanks Hawk, and Buzz, it is indeed, SW VA here, gotta represent! Chrome running boards, grille, ferder trim, stainless tailgate & mudflaps, NASCAR stickers in the window..... cause thats how I roll my 13 MPG. Actually I wish I could sell it and get something that fits in parking spaces easier & fills for under $75.

I'll get on that water pump this weekend....or next. I don't drive it much, have a company vehicle & the bike so it mostly sits unless I take the kids somewhere.
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Old 03-17-2011, 07:11 AM   #5
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Avalanche is a fun fun game!
AAAvalanche is an ACTION GAME!!
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Old 03-17-2011, 08:22 AM   #6
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I'm thinking your thermostat is bad, and the engine never heats up.

Which, incidentally, will torpedo your fuel economy, as the engine never leaves the 'cold' mode, and runs really rich.

In any case, change it when you do the water pump.

And don't put any other than the original spec (temperature) unit in it.
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Old 03-17-2011, 01:46 PM   #7
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^^^ what he said, always change your thermostat if you switch your water pump.
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Old 03-17-2011, 02:11 PM   #8
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Quote:
Originally Posted by pushrod View Post
I'm thinking your thermostat is bad, and the engine never heats up.

Which, incidentally, will torpedo your fuel economy, as the engine never leaves the 'cold' mode, and runs really rich.

In any case, change it when you do the water pump.

And don't put any other than the original spec (temperature) unit in it.
Good point, thanks and for the additional $12, may as well do it while the tools are out & hands are dirty.
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