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Pontiac Aztek Thermostat Problems

38 messages,  Last post on Feb 07, 2009 at 3:18 PM

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What is this discussion about? Pontiac Aztek, SUV


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#1 of 38
HAS ANYBODY CHANGED THERE THERMOSTAT ON A 2001 PONTIAC AZTEK? by chubster
Oct 15, 2006 (6:22 am)
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HAS ANYONE ATTEMPTED TO REPLACE THERE THERMOSTAT ON THERE 2001 PONTIAC AZTEK IF SO WAS IT DIFFICULT. WOULD BE POSSIBLE TO GET AN IMMEDIATE RESPONSE IT WOULD BE HELPFUL. WE HAVE HAD THIS TRUCK FOR 3 YEARS NOW AND WE HAVE REPLACED THE TRANSMISSION,THE RADIATOR COMPRESSOR AND THE AC/HEATER CONTROLS.
#2 of 38
Re: HAS ANYBODY CHANGED THERE THERMOSTAT ON A 2001 PONTIAC AZTEK? [chubster] by upslims
Oct 15, 2006 (3:17 pm)
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Replying to: chubster (Oct 15, 2006 6:22 am)

I thought about it for a while..I have an 02' w/ an extended warranty. When it finally goes I'm bringing it into the shop. You have to pull the exhaust manifold (located directly above the thermostat) off (theres a bracket and I believe 3 bolts, use a mirror to see them) Then there are 2 rubber lines below the manifold that are applying backpressure and holding the manifold on. I pulled everything apart except for those lines because I started to get nervous about it. Anyway I believe once you do that you will probably lose some radiator fluid. I used to have Jeep Cherokees and it used to take about 15 min. to swap a thermostat. I like the aztek but am probably going to ditch it when the warranty runs out. Too expensive to maintain. Anyway good luck.
#3 of 38
Bump Bump... by bulldog31313
Oct 27, 2006 (12:56 pm)
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As I am accelerating, my vehicle seems to jerk really hard as it changes gears. What causes this?
#4 of 38
Re: Bump Bump... [bulldog31313] by ray80
Oct 30, 2006 (9:30 am)
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Replying to: bulldog31313 (Oct 27, 2006 12:56 pm)

There was a TSB dated July 02 that may address this, I'll put part of it here:
Bulletin No.: 0O-07-30-002B
Subject:
Slips, Harsh Upshift or Garage Shifts, Launch Shudders, Flares, Erratic Shifts and Intermittent Concerns, DTC P1811 or P0748 Set (Replace Pressure Control Solenoid Valve Assembly)
 
Condition:
Some owners of the above vehicles with a HydraMatic 4T65-E transaxle may comment on harsh upshifts or harsh garage shifts, soft shifts, shudders on hard acceleration, or shifts erratic. These conditions may appear intermittently or set a DTC P1811 or P0748. During diagnosis, a low or high line pressure (actual versus desired) may be observed.
 
Cause:
The above condition may be due to any one of the following which may affect line pressure output:
 
Sediment inside the pressure control (PC) solenoid valve, causing the PC solenoid valve to mechanically bind.
Sediment in the valve body, causing the torque signal regulator valve to stick.
Incorrect transaxle oil level.
#5 of 38
Fuel gage not working by chubster
Oct 31, 2006 (9:04 am)
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Hi I have a Pontiac Aztec 2001 and the fuel gage is not working it goes up and down, so I never know when my gas is running low, the low fuel light still comes on but at times it will go off, I have resorted to just watching how many miles i have driven. Has anyone had this problem please help!!!!!!!
#6 of 38
Re: Fuel gage not working [chubster] by ray80
Oct 31, 2006 (9:33 am)
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Replying to: chubster (Oct 31, 2006 9:04 am)

Usually its the sending unit in the gas tank. It may have failed outright or may be sticky due to contamination (the right kind of fuel additive might fix it). Also there may be some corrosion in wireing that goes there.
#7 of 38
Temperature Gauge by cs0729
Jan 25, 2007 (7:44 am)
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I have a 2001 Aztec. My problem started when the weather started turning cooler and would run heater in the mornings on way to work. At the beginning the Service Vehicle Soon light would come on and at the same time the temperature gauge would plummet to cold. Heater still worked fine. When I would come home with no need to run heater the Service Vehicle Soon light would go out and the gauge would start working again and the temperature would be a normal operating temp. Now that the outside temperature is consistantly cold and the heater is used daily the Service Engine light has come on too. Have flushed the radiator, the heater works fine and have not seen any leaks from radiator. Could this be the water temp sensor? Can anyone help
#8 of 38
Re: Temperature Gauge [cs0729] by ray80
Jan 25, 2007 (8:43 am)
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Replying to: cs0729 (Jan 25, 2007 7:44 am)

I did a little looking around and found another owner that had same symptoms. Turned out to be stuck open thermostat. In that case it cost them $500 even with extended warranty due to multiple trips ($100 deductible per trip) and other parts being replaced (most likely when they didn't have to be). Also be aware another owner changed their at the expense of 5 1/2 hours and a bottle of iodine for skinned knuckles to save $300 shop wanted for replacement of $10 part. Good luck
#9 of 38
Re: Temperature Gauge [ray80] by cs0729
Jan 26, 2007 (6:00 am)
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Replying to: ray80 (Jan 25, 2007 8:43 am)

Thank you so much. I remember when it was easy to diagnose a bad thermostat. Think I can afford a little frustration and a bottle of iodine! Will try your suggestion and let you know if we survive. Thanks again.
#10 of 38
Re: Temperature Gauge [cs0729] by dallasaztek
Feb 01, 2007 (4:55 am)
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Replying to: cs0729 (Jan 26, 2007 6:00 am)

Hey I would like to ask you how you survived? I am having the same problem with the thermostat in my Aztek. How did you get to the thermostat? I have already flushed it and now they are telling me I might need to replace the thermostat. All I can say "Please Help".
Thanks">

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