I think the C70 series shares the wiring with the V70 series earlier generation called P80 It sounds like the clutch is pulling too much current - that is the only thing that has electrical load on the AC system. You probably have to replace the clutch as the wired part is under the pulley It is pos...

I would get them and do a transmission fluid change on the one with 100K on it.
Take your time to do a head gasket on the one with 140K on it.

Do a series of drain and fills and go enjoy it until the trans dies then swap i a new one - I hope that is in 2050!!

I add a video on YouTube trying to show exactly...thanks to everyone. Will not engage Drive after engaging Reverse? Something sticky? As Abscate suggested, do a series of Drain and Fills (not Power Flushes*), it might clear up if you get all the gunk out of the transmission. * A Power Flush is a no...

Transmission dipstick Volvo part number 30713102. Fits: Volvo C30 2.4l 5 cylinder 2007, 2008, 2009, 2010, 2011 Volvo C30 2.5l 5 cylinder Turbo 2007, 2008, 2009, 2010, 2011, 2012, 2013 Volvo C70 2.4l 5 cylinder 2006, 2007 Volvo C70 2.5l 5 cylinder Turbo 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 ...

They are awfully stumpy small dipsticks and totally different in location to a 98 S/V/C 70
The lower radiator hose needs to be pushed aside to view it from the top. Wear gloves as it gets hot down there!!

On the rear of the cams: 1. The two slots, one each camshaft should be horizontal (3:00 to 9:00). 2. The slots are off center. Intake should be above center and exhaust below center. There is a tool that bolts on the rear of the cams and keep the camshafts in the correct position as you align the ot...

Have you checked the condition of the battery cables? Remove them and look for corrosion at the terminal and in the cable end. Then check the power at the cable as it arrives at the fuse box under the hood. You should have 13+ volts under the hood at power terminal. The power cable can corrode inter...

I don’t have a specific answer for you but here is some technical documentation:
https://www.volvoclub.org.uk/volvo_workshop-c70.shtml