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Thermostat Jiggle Valve on 3.4L 6 Cyl TRD

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Old 01-20-2014, 11:22 AM   #1
skeezix [OP] skeezix is offline
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Thermostat Jiggle Valve on 3.4L 6 Cyl TRD

After replacing the thermostat I was browsing through my repair manual and noticed that the jiggle valve must be up plus-or-minus 15 degrees. I don't recall in which position I installed the thermostat.

How important is the location of the jiggle valve and if it is not up what will happen?
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Old 01-20-2014, 12:35 PM   #2
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Quote:
Originally Posted by skeezix View Post
After replacing the thermostat I was browsing through my repair manual and noticed that the jiggle valve must be up plus-or-minus 15 degrees. I don't recall in which position I installed the thermostat.

How important is the location of the jiggle valve and if it is not up what will happen?
If air is not bled from system it can overheat. Purpose of jiggle valve is to bleed system of air without having to do it manually.
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Old 01-20-2014, 03:00 PM   #3
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Quote:
Originally Posted by skeezix View Post
After replacing the thermostat I was browsing through my repair manual and noticed that the jiggle valve must be up plus-or-minus 15 degrees. I don't recall in which position I installed the thermostat.
How important is the location of the jiggle valve and if it is not up what will happen?
I'm getting a little tired of posting this, so for one last time.
The Toyota FSM gives that spec for the 4 cyls and "down" (6:00) for the 3.4.
It is has been widely documented on this and many other forums that placing it "up" on the 3.4 results in about a 10* increase in the ECT sensor reading.
Read this entire thread before commenting. http://www.yotatech.com/f2/5vz-fe-ru...81/index2.html

FSM for the 3.4
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Old 01-20-2014, 03:44 PM   #4
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Quote:
Originally Posted by Dirty Pool View Post
I'm getting a little tired of posting this, so for one last time.
The Toyota FSM gives that spec for the 4 cyls and "down" (6:00) for the 3.4.
It is has been widely documented on this and many other forums that placing it "up" on the 3.4 results in about a 10* increase in the ECT sensor reading.
Read this entire thread before commenting. http://www.yotatech.com/f2/5vz-fe-ru...81/index2.html

FSM for the 3.4
I was actually just wondering this the other day... You da man
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Old 01-21-2014, 03:46 AM   #5
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10-13 degree difference in temps is what I got.
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Old 01-25-2014, 03:04 PM   #6
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When I removed the thermostat, the jiggle pin was at the 12 o'clock position and when I installed the new thermostat I placed the jiggle pin at the 12 o'clock position.

I bought the truck brand new in January of 1998, BTW.
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Old 02-20-2014, 11:47 PM   #7
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I just replaced rad hoses and thermostat. I was confused after reading in my Haynes manual that it should be at 12 o'clock. Mine was coincidentally came out with it at 7 o'clock. I was confused as I'm the original owner and it's other original thermostat, so I searched here. I trust y'all and the FSM that was referenced so, I put it at 6. Strange about the typo in the Haynes though been using those for 20 years...
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Old 02-21-2014, 07:09 AM   #8
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I just picked up a Gates 170 degree thermostat to replace mine and it doesn't have a jiggle valve. Do you guys think this will lead to problems?

If so, does anyone have a part number for a toyota 170 degree thermostat for the 3.4?
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Old 02-21-2014, 07:16 AM   #9
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Does it have a little "bite" out of the outer circumference? If so, put it in with the bite at 6 o'clock. Or, pays your money at the dealer.
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Old 02-21-2014, 08:51 AM   #10
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PN 90916-03075

Toyota part.
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