Question about 2005 Volvo S60

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I have occasionally noticed a situation with my 2003 Volvo S60 that when I run the air conditioner and am slowing down it almost feels like an immediate drop down in gear on the transmission. It's hard to correctly describe because It doesn't happen often enough to get a real feel for what's happening. Before and after each incident the car runs perfectly smooth with no indication that there is anything going on with the transmission. I'm a bit baffled. Your help will be greatly appreciated.

Posted by ssandbank on

  • ssandbank Aug 15, 2008

    Yes, the rpm's do drop significantly. I'm not sure if below 500 although it does seem that the engine is close to turning off sometimes before the rpm's come back up. Having said that, the car has always dropped rpms significantly when coming to a stop since it was new. Took it back to the dealer several times and they found nothing wrong and said the car was designed to do this but they did a number of software upgrades anyhow resulting in no significant change in the car's behavior. I will try your suggestion and see if it helps. Thanks




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Does your RPM's dip from about 1,000 to just a tad below 500?

If so...try cleaning out your throttle.

Be sure not to spray throttle cleaner directly into the throttle, but on a rag and wipe away. Use something to hold the throttle plate open and use a small brass brush, dip into the throttle cleaning solution, and start to scrub away some of the built up soot.

Afterwards, wipe it down till you see a rather shiny throttle.

Posted on Aug 14, 2008

  • Anonymous Aug 15, 2008

    We have had problems with certain throttle modules.

    Look for a sticker on the throttle module, should be facing towards the fan and let me know what color the sticker is. Should be white or yellow.

    One thing to remember if you are going to take the throttle off...disconnect the battery. The throttle sits above the starter and if you take it could drop and start arcing. And you should get a new gasket for the throttle if you plan on taking it off.



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