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Username Post: no heat..everyone read need input please        (Topic#205181)
Posts: 8

Reg: 06-26-07
12-13-08 10:29 PM - Post#1584389    

hey all
the wife has a 06 impala 3.5l and the heater will blow heat if were going down the hiway. but if we let of the gas or drive slower the heat diminishes.also if its idling it will blow cold air.
would it be the thermostat?
if so where is it does anyone have pics or a free online manual.

any help would be greatly appreciated as it is -40 here right now and the wife is cold


Posts: 978
Age: 30
Loc: workin on da truck
Reg: 02-07-03
12-14-08 12:16 AM - Post#1584441    
    In response to scrapdaddy

i hate to ask the obvious, is it still in waranty?



60 short step and 05 cavalier coupe

sometimes even a blind squirrel gets a nut...

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Posts: 8

Reg: 06-26-07
12-14-08 09:01 AM - Post#1584578    
    In response to khemmis

no warranty left bought the car used or i wouldve taken it to the dealer

Senior Member
Posts: 526

Loc: Silvertown, Ma.
Reg: 12-03-03
12-15-08 02:41 PM - Post#1585398    
    In response to scrapdaddy

Make sure the coolant level is up where it belongs. Then, with the engine running, unsrew the coolant system bleeders one at a time. Do the one on top of the thermostat first, slowly turn it until you get a steady stream of coolant, close it, then, go to the coolant tube on the front of the engine, next to the water pump. there will be another bleeder there, that tube goes to your heater core. Bleed that one too.
After all this, carefully inspect the entire engine area for any signs of coolant leaking. Check you oil to make sure that no moisture is getting in there. good luck, keep us posted

Forum Newbie
Posts: 28

Reg: 08-20-08
12-31-08 04:09 PM - Post#1596359    
    In response to IBGM

I have an 06 SS Impala with the same problem, but I have the 5.3L. My warranty has expired. I don't know what the problem is.

06 Impala SS
85 Caprice Classic
80 K10
55 Bel Air Wagon

Senior Member
Posts: 528
Loc: Minnesota
Reg: 04-02-02
01-04-09 07:34 PM - Post#1599398    
    In response to jhudson78

Ditto on checking coolant level first, else . . .

I had a similar problem with my '05 Malibu where I would get not heat whatsover. They had to replace the heater control module in the dash. Major project, had the car for 2 days to trouble shoot and then repair it.

"The machinations of my mind are an enigma."

Patrick Starfish

Posts: 36
Age: 52
Loc: foothills of the Adironda...
Reg: 08-29-08
01-07-09 07:53 AM - Post#1601269    
    In response to Mikey1946

seen it before.this bulletin is the fix........

Service Information 2006 Chevrolet Impala | Impala, Monte Carlo (VIN W) Service Manual | HVAC | Bulletins By Category | Technical | Document ID: 2088005
------------------------- ------------------------- ------------------------- -----

#PIC4301B: Poor Heat at Idle - (Mar 28, 2008)

Subject: Poor Heat at Idle

Models: 2006 - 2008 Chevrolet Impala

2006 - 2007 Chevrolet Monte Carlo

------------------------- ------------------------- ------------------------- -----

This PI was superceded to update model years. Please discard PIC4301A.

------------------------- ------------------------- ------------------------- -----

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Poor heat at idle, however, if the engine RPMs are raised the concern no longer occurs.

Recommendation/Instructio ns:
Note: Be sure to follow all SI safety procedures and caution notices.

With the engine cooled off, remove the coolant pressure cap.
Remove upper heater core hose from the metal pipe on the engine.
Add coolant to the metal pipe, until full.
Raise the rubber portion of the heater core hose as high as it will go with it still attached at the heater core. Using a funnel, add coolant until the hose is full.
Reconnect the heater core hose.
Start engine, have assistant raise the RPMs to about 1500 to 1700 RPMs, top coolant off at engine, then before lowering engine RPMs, install the coolant pressure cap.
Fill coolant reservoir as necessary, then check the heat at idle.
Note: If the vehicle returns for the same complaint perform the cooling system draining and refilling procedure outlined in SI, document ID 1783911.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.


Posts: 35

Reg: 10-13-08
01-08-09 08:07 PM - Post#1602510    
    In response to GreenStreak

That bulletin works...I've done it to a couple of Monte Carlo's at the shop recently.

'88 Astro "the Astruck"
'25 Chev rat-rod
GM Master tech since '96
Pullin' wrenches in Freindly Manitoba.


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