Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









Pontiac Montana-Vibration heard only inside car when stopped


  Email This Post



JonL
New User

Nov 10, 2011, 7:32 PM

Post #1 of 4 (1665 views)
Shortcut
post icon Pontiac Montana-Vibration heard only inside car when stopped Sign In

2003 Pontiac Montana;3.4 liter;160,000 miles> low pitch vibration/humming noise heard in car cabin while in park or stopped at intersection. Cannot hear sound outside of car. Sound dissipates as car speed is increased. Sound is not related to increase in engine RPM. Engine does not miss or hesitate, engine smooth through increase in RPM.
engine does not appear to be running rough at idle. Checked exhaust system for source of vibration, nothing found.
Cannot really feel vibration, but you hear that type of sound.
Intermitant smell of coolant inside car started about the same time.
Some dash lights are out> Left side of speedometer and the stereo lights went out after start of humming sound.
Timing of problem-The car had sat idling for 20 minutes in heat of day to keep AC running about a week prior to problem start, but engine temperature gauge never showed elevated temp.
Transmission has started to slip on lower gear shifts when cold, about 2 months prior to this vibration issue.
Does this sound like some type of failure in engine or transmission dampening; or a vibration translated through HVAC system/firewall into cabin/dash? Can't a find a prior history of this system for Pontiac Montana's online.
Would like suggestions for trouble shooting to find source? Sound is getting on my my wife's nerves, need to solve.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 10, 2011, 9:39 PM

Post #2 of 4 (1642 views)
Shortcut
Re: Pontiac Montana-Vibration heard only inside car when stopped [In reply to] Sign In

My WAG (wild arse guess) is if this doesn't change with RPM with the smell of coolant I think it MIGHT (long shot) be in the HVAC system like perhaps the blower motor/squirrel cage. Odor of coolant? Hope you don't need a core as most are no freaking fun. Any change with blower speed?

Back: 20 min with A/C on shouldn't be a problem. Think of the cabs, limos, livery cars, and tons more that wait that long or longer.

That's about all I can think of not RPM related or affected much by engine speed,

T
_________________________________________
Long retired now


JonL
New User

Nov 11, 2011, 12:38 AM

Post #3 of 4 (1627 views)
Shortcut
Re: Pontiac Montana-Vibration heard only inside car when stopped [In reply to] Sign In

Thanks, I'll look at HVAC first.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Nov 11, 2011, 5:50 AM

Post #4 of 4 (1623 views)
Shortcut
Re: Pontiac Montana-Vibration heard only inside car when stopped [In reply to] Sign In

Blower and cage first. Perhaps rodent issues and off balance? Might feel it by hand on body of blower motor if so?

T
_________________________________________
Long retired now




Pontiac Montana-Vibration heard only inside car when stopped


  Email This Post
 
 






Latest Forum Post

i have just had a new exhaust manifold and manifold gasket fitted. however there...


2003 Dodge Grand Caravan V6 3.6 170,000 mi. Over the last few months we have ha...


Hello! I have a 2000 Chevy malibu with the 3.1 v6 engine. the vehicle has about ...


Vehicle: Dodge, Stratus, 4 cylinder, 2002. Immediately after start up as I back ...


Heya guys, new to the forum, and I hope you can help me. My 2001 Renault Clio (...


Hey guys so i have done plenty of wheel bearings in the past, always rent my tor...


Feed Button






Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap


Search for (options) Privacy

web statistics