Weird temp behaviour after belt tensioner change - Volvo Forums - Volvo Enthusiasts Forum

Volvo XC90 This mid-sized SUV offers the driver and passengers Volvo luxury and quality with sport utility capability.
Sponsored by:
Sponsored by:

Thread Tools Search this Thread
Old 12-16-2017, 10:42 PM
Thread Starter
Join Date: Jun 2015
Posts: 46
Unhappy Weird temp behaviour after belt tensioner change

Days ago our xc90 (2008 3.2L) auxiliary belt tensioner fails, then the belt stuck and it looks like the water pump was involved in overheat the engine. The engine became hot and the coolant deposit expelled the water. Also the power steering fails because it works in the same belt path.

The tensioner was replaced, belt and pulley also. But now the engine temperature gauge in weird. When the car is riding or accelerating the temperature goes down, then in idle or stop at lights, the temp goes up! (Not pass the middle) Of course when the car is moving goes down close to bottom indicator.

I was thinking about the thermostat but... could be a cracked or cut hose?

Last edited by rudva; 12-16-2017 at 10:49 PM.
Reply With Quote
Old 01-13-2018, 11:09 AM
Junior Member
Join Date: Nov 2017
Location: Southwest Colorado, USA
Posts: 17

The water pump doesn't run off of the serpentine belt. It runs off of the timing belt. Maybe you should pull the t-belt cover and check it out in there. A bad water pump would mess with your engine temps I guess.
Or it could be a bad thermostat?
Reply With Quote
Old 01-13-2018, 02:58 PM
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 3,774

you can also check the connections to the coolant temp sensor - on the T-5s it plugs into the housing right below the thermostat. Most people replace the T-stat when doing the sensor so it may be a good time to do both. If the problem seems to be the gauge and your not boiling over, then that's the likely cause. But just the same, if you had a serpentine belt go, you sould inspect the timing belt as well to check for any collateral damage. Water pumps can start leaking through the bearing and will drip under the timing belt cover.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Weird Steering Behaviour aelassy Volvo S60 & V60 3 04-09-2012 06:11 PM
Timing belt change - how to compress hydraulic tensioner? momsmechanic Volvo 850 17 07-06-2009 12:33 PM
850 stops, odd temp guage behaviour Marvin42 Volvo 850 1 03-13-2007 08:49 PM
Cooling fan temp sensor/temp gauge/timing belt vcolper Volvo 240, 740 & 940 1 11-01-2006 10:20 PM
Odometer Reset and Strange Alarm Behaviour rperks Volvo V70 1 10-05-2004 10:29 PM

auxiliary belt, belt tensioner, overheat

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 05:48 AM.

© 2018 MH Sub I, LLC dba Internet Brands
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.