2004 Pontiac Montana, temp gauge never reset when car turned off, now it is laying past the boiling point,

SOURCE: possible overheating, 2004 pontiac montana

Its definitly a bad reading, you would know if your vehicle is overheating, you can usually smell it right away.I would say its your temperature gauge sending unit is defective, check the wires to see if they are well connected or broken. ask a backyard mechanic for assistance.

SOURCE: temp gauge and gas gauge not working

I had the same problem with my 2001 Pontiac Montana and the intake manifold gasket. This is a major problem with these 3.4L engines, if you are in the states I'm pretty sure there is a class action law suite against GM for this. I had my manifold gasket replaced and it was about $1000 CAD. You need to get your vehicle looked at right away as this could cause major engine damage, coolant will leak into the engine and soon enough you will be replacing that too. Good Luck

SOURCE: 2004 Pontiac Aztek Odometer light

Cluster is pretty much non serviceable. It's a circuit board problem that will have to be fixed by a cluster repair shop.

Shannon L Washam

• 169 Answers
• Posted on Oct 15, 2009

SOURCE: problem with tempture gauge. keeps reading high

Hello! This is actually a pretty common issue on the '04's - and I've had it myself. There was a TSB put out about it, in fact. Here is the info from the TSB:

Subject: Speedometer Erratic Movement, Fuel Gauge Does Not Go to Full After FIlling, Engine Coolant Temperature Gauge Reads Hot and Coolant Temperature Light Illuminates (Reprogram IPC) #05-08-49-003A - (04/18/2005)

Models: 2004 Pontiac GTO Built Prior to VIN Breakpoint 4L296011
Condition Some customers may comment on one or more of the following conditions:
• Speedometer jumps erratically. Gauge may go up to 200 MPH or not return to zero. • Fuel gauge does not move off empty when tank is full. • Engine coolant temperature gauge reads hot and coolant temperature light illuminates. These conditions may be intermittent.
Correction Technicians are to reprogram the IPC with an updated software calibration. This new service calibration was released with TIS satellite data update version 1.0 available January 10, 2005. As always, make sure your Tech 2® is updated with the latest software version.
Important: Vehicles built after the VIN breakpoint must have the IPC replaced to correct these conditions.
Warranty Information For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
N4199
Instrument Panel Cluster (IPC) -- Reprogram
0.4 hr

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.