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Herb Concord Ca · 09-11-2015, 04:52 PM

Hi I have had my Volvo for over 10 years, the solenoid will work just fine on 6 volts even though it's rated for 12 volts.
Try running a jumper wire directly from the battery to see if the solenoid clicks, it should, just like your test with 12Volts.
If it clicks, check your switch and or wiring to confirm you have 6 volts on the solenoid.
Like others have said the pump is driven off the shaft and needs to be turning to generate pressure to engage the cone clutch to shift into overdrive.
Oil level is important also the type of oil you use. Depending on pump wear, you may have to try a heavier oil. Mine won't shift with ATF on hot days so I use 10W-40 motor oil in .
Hope the above helps.

09-11-2015, 04:52 PM	#7
Herb Concord Ca Senior Member Join Date: May 2010 Location: Concord CA Posts: 635	Re: Volvo overdrive question Hi I have had my Volvo for over 10 years, the solenoid will work just fine on 6 volts even though it's rated for 12 volts. Try running a jumper wire directly from the battery to see if the solenoid clicks, it should, just like your test with 12Volts. If it clicks, check your switch and or wiring to confirm you have 6 volts on the solenoid. Like others have said the pump is driven off the shaft and needs to be turning to generate pressure to engage the cone clutch to shift into overdrive. Oil level is important also the type of oil you use. Depending on pump wear, you may have to try a heavier oil. Mine won't shift with ATF on hot days so I use 10W-40 motor oil in . Hope the above helps.