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overheating, no heat
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nickv1124
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PostPosted: Wed Nov 07, 2012 2:34 pm    Post subject:  overheating, no heat Reply with quote

So about 2 months ago i was driving to the store and my temp gauge shot al lthe way to the red, so i immediately pulled over and checked for anythign obvious like coolant spewing out, nothing. So i sat there for a few mins. restarted the car and everything worked and the temp gauge returned to normal operating temp. Now the other night i jumped in my car and a few miles down the road my temp gauge reached operating temp and then just kept on goin all the way to the red again, and the heat was blowing nothing but cold air. So i pulled over and turned off the car, checked for any obvious signs and nothing, the only thing i did notice was a lil bit of steam in the coolant overflow tank. i sat there a few mins and restarted the car and boom the temp gauge went to normal operating temp and stayed there and my heater started blowing hot again. IM thinking a thermostat that is sticking from time to time? Whatcha think? Wintrer is coming i gotta have heat!
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VTSS
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PostPosted: Wed Nov 07, 2012 4:54 pm    Post subject:   Reply with quote

+1 on the thermostat. Start with that, its cheap and easy to replace.

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Bill58
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PostPosted: Wed Nov 07, 2012 6:59 pm    Post subject:   Reply with quote

If the thermostat was a stuck closed you would have a hot heater.
Check / fill the radiator. If the problem persists it may be head gasket time.
Thermostat is a pia to change on the 3.4
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wde3477
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PostPosted: Wed Nov 07, 2012 9:25 pm    Post subject:   Reply with quote

Agree with Bill58 - make sure your coolant system is full and purged of any air.

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nickv1124
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PostPosted: Thu Nov 08, 2012 12:37 am    Post subject:   Reply with quote

Just one other thing that came to mind, I also have heard "sloshing" in the dash board does that change anything?
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wde3477
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PostPosted: Thu Nov 08, 2012 9:00 am    Post subject:   Reply with quote

Suggest the sloshing noise is a good sign there is air in the system. Low coolant level could cause the erratic readings with the temperature gauge. Recommend to verify level before damage is done to engine...

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madbrad
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PostPosted: Thu Nov 08, 2012 5:49 pm    Post subject:   Reply with quote

Lack of coolant makes the engine hot, of course, and the guage will go way up. At the same time, there's no coolant carrying heat to the heater core, so the air blows cold. My heater valve got cracked and busted in half and all the coolant drained and got pumped out and that's what happened, the air from the dash vents went from hot to cold when all the coolant flowed out onto the road. But that was 20 years ago in a Dodge Lancer. So a major leak can cause your symptom.
So anyway if there's air in the system, the conditions are similar to that. Sometimes air does not work itself out.

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nickv1124
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PostPosted: Fri Nov 09, 2012 10:04 pm    Post subject:   Reply with quote

UPDATE: I went and bought some dexcool and topped off the radiator, that didnt take much at all, but the overflow reservoir was pretty low below the "cold " level. so I filled that up and there is heat, a lot less sloshing in the dash and no more overheating issues but i haven't been longer than a ten or fifteen mile drive yet. I'm thinking a radiator flush and refill in the next week or two ought to do the trick.
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wde3477
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PostPosted: Sat Nov 10, 2012 9:48 am    Post subject:   Reply with quote

Suggest to understand and follow the recommended flushing procedure for your vehicle.

Just completed a coolant change on mine, solely due to miles and age of coolant. The recommendation in the 'official' Chevy Impala shop manual for my model year was that if the coolant was clear and clean, to just drain and refill. If the coolant was fouled, the recommendation was to drain, fill , and circulate with 'clean, drinkable water', repeat until clear.

The use of chemical cleaning agents was specifically mentioned as a 'don't do this'.

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98ss
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PostPosted: Sun Nov 11, 2012 2:30 am    Post subject:   Reply with quote

If there is sloshing...there is air in the system. Open the radiator cap when it is cold and fill it up then bleed it out. If it is low then you have to figure out where the coolant went.
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gg05impala
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PostPosted: Sun Nov 11, 2012 3:12 pm    Post subject:   Reply with quote

i had this exact problem. I bled the system, got ride of the air, and filled it back up... got rid of the "running water" sound as i called it, but i like "sloshing water" sound better.. Plus i got heat back

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nickv1124
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PostPosted: Sun Nov 11, 2012 4:30 pm    Post subject:   Reply with quote

wde by flush I was thinking drain, rinse with water and refill, no detergent. Alright, gg05 I am going to try that same thing this week sometime, thanks for the input
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nickv1124
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PostPosted: Sat Nov 24, 2012 12:09 am    Post subject:   Reply with quote

UPDATE: So now the temperature gauge will climb all the way to the red and the hot coolant temp light comes on and the heater will blow cold air. Then i will hit the gas and the temp gauge will return to normal operating temp. and there will be heat. This vicious cycle continues as long as i am driving. Time for a trip to my mechanic for a little diagnostics?
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Frank4202
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PostPosted: Sat Nov 24, 2012 3:25 am    Post subject:   Reply with quote

Is this a 3.8L or 3.4L? Sounds like either a t-stat or possibly head gasket.

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nickv1124
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PostPosted: Sat Nov 24, 2012 10:38 am    Post subject:   Reply with quote

3400
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