How do I check and/or add trans fluid to a 2001 Volvo C70?

Question edited for clarity.
Question moved to model category.

2012 C70 Transmission Dip stick where is it?

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Jun 24, 2020 - the newer Asins like the 6 and 8 speeds use a dual drain plug design where the inner plug is removed to set the level via an overflow tube and ...

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Older models had a yellow dip plug.

on google:

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by using the stick for it..red or yellow cap..if low add one qt at a time until full..up to 6

Sounds to me that your transmission is put itself into what is call (Limp Mode). This happens when the transmission fluid in the trans hydraulic valve body located on the bottom and in the trans pan are not within the parameters of the transmission computer. You can remove the trans pan and gasket to check for metallic material in the bottom of the pan. There is normally a strong magnet in the pan catch the material so I can't move freely through the transmission itself. It only takes a very small piece of foreign material to stop the flow of the valve body fluid. I would first take it to somewhere that had a automotive diagnostic scan tool that can read transmission codes to see if there are any active codes. Next you can drop the transmission pan yourself and look for material in it. Basically do a visually inspection and service the transmission fluid, gasket, and filter. Remember, all a automatic transmission is a extremely complicated fluid pump. If its pumping trans fluid properly it's probably working just fine. Been when the trans fluid gets hot, scorched, and stops moving. It will not work. Hope this helps

First check trans. fluid. It should be full, & clean. Clean means light red color fluid (like red cool-aid) if it looks like darker red, or brown fluid, like motor oil, that is way too dirty & should be flushed. May need to change the filter too. dirty trans. fluid is your big enemy. could also be an electrical problem in the trans like a shift solenoid or something like that, but check for clean fluid first.

That dimension is not mentioned in the service manual.

Some cars don't have a transmission oil dipstick. You are just supposed to replace the transmission fluid at how many miles the manual tells you.Check the manual to see when the transmission fluid needs to be replaced.

Access to the transmission dip stick is not easy. It is hidden deep under tube and wiring beneath the air intake tube near the battery, it has a yellow top labelled 'Trans' and has a clip that secures the top in place. Check the fluid level when the engine is running and the transmission is in 'park'. If low find some suitable hose to locate it into the dip stick tube and then fit a funnel in the end of this 'extension'. The fluid specified is AW5, Volvo part number 1161540-8, do not use anything else as some fluids do not mix well. Add fluid about a pint a time and check the level each time.

do a vehicle search before buying, contact you local ministry for the car history, see popular mechanics auto dept for details

When was the last time you had a trans flush ? Sounds like you could use one. Trans fluid breaks down and doesnt work as well as i did when it was new. There are also sensors that tell it when to change gears could also be a sensor. I would start with a trans flush if it were my car. always try the least expensive first. then if u still have the problem look into calling a trusted transservice and ask them if the have any experiance in Volvo trans. if not fluid my bet is on a sensor in the transmission. Good luck and hope this helps ya.