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Home » Public Forums » GMCnet » Re: [GMCnet] Checking THM425 Fluid Level
Re: [GMCnet] Checking THM425 Fluid Level [message #289906] Tue, 03 November 2015 21:40 Go to previous message
fbhtxak is currently offline  fbhtxak   United States
Messages: 191
Registered: April 2006
Karma:
Senior Member
For Ken Henderson:

I am consulting you for myself and others who may share my frustration in
checking the THM425 fluid level with the OEM dipstick immediately after
changing fluid and filter..

IIRC, you recently advised to remove the vacuum modulator and fill until the
fluid flows from the VM connection.

1. Is that after starting the engine (cold), cycling through the selector
positions from/to "park" and then shutting down the engine?
2. How did you determine that the THM425 is properly filled (cold?) when
fluid flows from the VM connection? Correlation with the dipstick when you
finally got a readable level?

In the past, I have waited several hours to get a readable level after the
initial fill. I then estimate the volume required to bring the level to the
"cold" mark. I then wait another several hours to see if I got it right.
There has to be a better way than the way I have done it for 25 years.

'Appreciate your guidance...

Fred Hudspeth

1978 Royale (TZE "last four"... 1335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska







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