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2007 Impala heater trouble

 
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Oldrustycars
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PostPosted: Sat Dec 11, 2010 6:10 pm    Post subject:  2007 Impala heater trouble Reply with quote

2007 Impala 3LT, 3.9 engine, 73,000 miles. This problem just started this year. I get cool air blowing at idle. The temp gauge goes to operating temp just as it always did, points at the 9 o'clock position, and warms up normally. When driving the heat works great, just as it always has. But at an idle, the heat blows cool. If I rev it to 2000 RPM, hot air blows. Both heater hoses feel the same temp. I just had the cooling system professionally flushed, and they backflushed the heater core, which didn't seem to have any restriction. The system had the air bled out, and they even poured coolant right into the heater hoses until it ran out. Dexcool was NOT reused. No help at all. Coolant level full. Even sitting still running it to 2000 RPM gets nice hot air. Any ideas? Water pump not leaking, and bearing is quiet and no play, can the impeller be worn and no circulating coolant? The shop said the coolant still looked good.

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Last edited by Oldrustycars on Sat Dec 11, 2010 9:41 pm; edited 1 time in total
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wde3477
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PostPosted: Sat Dec 11, 2010 8:16 pm    Post subject:   Reply with quote

Figure if there were an impeller problem, the car would be overheating or at least running hotter than normal when idling for prolonged periods.

Sounds like a classic case of not enough coolant in the system, although you seem to have taken the necessary steps to purge any air.

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PushrodPower
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PostPosted: Sat Dec 11, 2010 9:53 pm    Post subject:   Reply with quote

Did you change the t-stat while you were in there? Might be worth a shot.

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hawkdoc60
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PostPosted: Sat Dec 11, 2010 9:53 pm    Post subject:   Reply with quote

I agree with wde3477 that it sounds like low coolant level, but if that is not the case, it might not hurt to have te thermostat checked.

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Oldrustycars
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PostPosted: Sat Dec 11, 2010 10:17 pm    Post subject:   Reply with quote

PushrodPower wrote:
Did you change the t-stat while you were in there? Might be worth a shot.

Engine warms up just as quick as it ever did. Comes up to temp in 10 minutes even at 5 degrees out. Shop felt if the thermostat was bad it would either run very cool (it doesn't) or overheat (it doesn't). But thanks for the idea.

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zim
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PostPosted: Mon Dec 20, 2010 2:01 pm    Post subject:   Reply with quote

I have had a similar problem on an 06 with a 3.9, there is a small coolant leak somewhere and the reason you don't have heat is because you are low on coolant. The car I was working on I topped off with coolant and the heat worked amazing at any rpm. Your overflow tank needs to be at least 1/2 full. The reason you dont have heat at idle is because when you are at a higher rpm you are circulating coolant faster and forcing it to circulate through the entire system. When you are at an idle fluids flow in the path of least resistance and your heater hoses are smaller then the main coolant passages, therefore you are not circulating to your heater core when at an idle, top off your overflow.
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Oldrustycars
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PostPosted: Mon Dec 20, 2010 8:41 pm    Post subject:   Reply with quote

Coolant IS FULL. I've checked it numerous times, both in the overflow tank and at the cap. The shop that flushed the system filled it and bled it. It has not dropped the level at all in two weeks.

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scott2173
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PostPosted: Mon Dec 20, 2010 8:46 pm    Post subject:   Reply with quote

check to see if there is a vacum line loose at the door that blocks between the ac and the heater core
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Oldrustycars
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PostPosted: Sun Jan 02, 2011 6:31 pm    Post subject:   Reply with quote

New water pump installed, problem is fixed. No other changes.

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