B20 thermostat 92c - Page 2

Derek UK · Jul 22nd, 2024, 13:12

Ron's cooling pages here https://www.sw-em.com/Cooling_System.htm
I've not seen the thermostats with that sort of flap valve but the extended plunger type is shown in a later diagram.
With the thermostat out, if you look down into the hole you will see the top of a tube. This is what is sealed off by the plunger until the stat opens. Hopefully this tube isn't missing. It will be same on your PV.

arcturus · Jul 23rd, 2024, 08:35

So far with 89c,a touch on the high side with our hot weather (35c) but acceptable. Just need to adjust the Kenlow fan regulator
FYI QTH 135T 89c.
Mahle TX 8 88d 88c.
Might try the Mahle
Thanks for all the info

142 Guy · Jul 23rd, 2024, 16:21

Quote:

Originally Posted by arcturus

Don't have green book. With new stat 88c gauge goes to middle and beyond. haven't had a chance to give extended run. Don't suppose that you could post a copy of the by pass?

Go here

https://volvo1800pictures.com/docume..._B20A_B20B.pdf

Pages 64 and 65 discuss the operation of the flap and the by-pass pipe. Failure to close the by-pass tube typically results in over heating because some of the coolant is not going through the radiator.

arcturus · Jul 24th, 2024, 08:15

thanks, that makes everything clear. Will remove 'stat and make sure that the top of the pipe has not worn and the 'stat actually makes clean contact and rectify if necessary.

Jul 23rd, 2024, 08:35	#12
arcturus arcturus Last Online: Today 08:32 Join Date: Mar 2006 Location: Sagres Portugal	So far with 89c,a touch on the high side with our hot weather (35c) but acceptable. Just need to adjust the Kenlow fan regulator FYI QTH 135T 89c. Mahle TX 8 88d 88c. Might try the Mahle Thanks for all the info __________________ life's too short to drink bad wine

Jul 24th, 2024, 08:15	#14
arcturus arcturus Last Online: Today 08:32 Join Date: Mar 2006 Location: Sagres Portugal	thanks, that makes everything clear. Will remove 'stat and make sure that the top of the pipe has not worn and the 'stat actually makes clean contact and rectify if necessary. __________________ life's too short to drink bad wine

Jul 22nd, 2024, 13:12	#11
Derek UK VOC Member Last Online: Jul 25th, 2024 12:01 Join Date: Jul 2006 Location: Chatham	Ron's cooling pages here https://www.sw-em.com/Cooling_System.htm I've not seen the thermostats with that sort of flap valve but the extended plunger type is shown in a later diagram. With the thermostat out, if you look down into the hole you will see the top of a tube. This is what is sealed off by the plunger until the stat opens. Hopefully this tube isn't missing. It will be same on your PV.

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