Reversing 5VZFE Thermostat Orientation - TTORA Forum
 
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post #1 of 8 (permalink) Old 02-09-2018, 03:45 PM Thread Starter
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Reversing 5VZFE Thermostat Orientation

Bought my '03 3.4 Taco in October and noticed my temps are quite a bit higher than on my '01 3RZFE. It's nothing absurd.. but it's mostly at 197 to 202 and that seems about 10 -12 degrees higher than normal for a Toyota.

I see peeps saying that the thermostat orientation of the jiggle valve being at 12 o'clock instead of 6 causes this.

Timing belt an thermostat were changed by the previous owner in 2014 so I'm guessing they put it at 12 oclock instead of 6.

If I want to pop the thermostat out and switch it to 6 o'clock, do I need to drain the entire cooling system or remove anything else... or can I just remove my skidplate, take out the 3 bolts and cover (losing a bit of coolant along the way) and spin the thermostat around then bolt it back up?

Will the gasket need to be replaced or should that be ok to reuse? I'm not sure if it's rubber or some papery material.

Thanks!!!!
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post #2 of 8 (permalink) Old 02-11-2018, 03:37 PM
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Somebody correct me if I am wrong. I thought there is some air trapped in cooling system, and rises to highest point. So jiggle valve is at 12 o’clock to have air bleed out. Also, you said previous owner did timing belt in 2014, maybe timing is off one teeth?

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post #3 of 8 (permalink) Old 02-12-2018, 01:02 AM
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I'd switch it to 6 o'clock. That is what the FSM says and Toyota owners have documented lower temps with jiggle valve at 6 vs 12.

Here is a nice long thread on the topic:
Why Does the Thermostat Jiggle Valve Position Make Such a Big Difference? - Toyota 4Runner Forum - Largest 4Runner Forum
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post #4 of 8 (permalink) Old 02-12-2018, 05:09 AM Thread Starter
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Originally Posted by ShowStop View Post
I'd switch it to 6 o'clock. That is what the FSM says and Toyota owners have documented lower temps with jiggle valve at 6 vs 12.

Here is a nice long thread on the topic:
Why Does the Thermostat Jiggle Valve Position Make Such a Big Difference? - Toyota 4Runner Forum - Largest 4Runner Forum
Yeah.. that's what I'm planning to do on the next warm day. I was just curious if I should replace the gasket or if it's reusable and whether or not I have to drain coolant or not(Maybe If I can pinch the bottom hose with something and prevent the coolant from coming out of the radiator).

I'd actually already read through that thread the day before posting this along the way of doing research.

You've surely one a thermostat on these... think that gasket nerds to be replaced each time?

Last edited by partyman666; 02-13-2018 at 01:32 PM.
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post #5 of 8 (permalink) Old 02-12-2018, 08:46 AM
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Originally Posted by ShowStop View Post
I'd switch it to 6 o'clock. That is what the FSM says and Toyota owners have documented lower temps with jiggle valve at 6 vs 12.

Here is a nice long thread on the topic:
Why Does the Thermostat Jiggle Valve Position Make Such a Big Difference? - Toyota 4Runner Forum - Largest 4Runner Forum
Apparently, I’m wrong about the thermostat, FSM said 6 instead of 12.

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post #6 of 8 (permalink) Old 02-17-2018, 10:40 AM Thread Starter
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Apparently, I’m wrong about the thermostat, FSM said 6 instead of 12.
Yeah... FSM definitely says 6. Seems weird compared to most, but I bet mine us in at 12 from previous owners mechanic doing it that way based on the 198 degree average cruising temp with AC\defogger off and during real cold winter nights.

I'm worried it might run too hot this way in summer when I'm stuck in traffic with the AC on.

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post #7 of 8 (permalink) Old 02-18-2018, 05:32 PM
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according to the scan gauge, I noticed a 12 degree differance between the two orientations in my 3.4. I was running at 202 in the 12 o'clock position and 190 at the 6 o'clock.


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post #8 of 8 (permalink) Old 02-18-2018, 07:09 PM Thread Starter
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according to the scan gauge, I noticed a 12 degree differance between the two orientations in my 3.4. I was running at 202 in the 12 o'clock position and 190 at the 6 o'clock.
Was this during warm weather or cold weather that you were seeing these temps, and with AC/Defogger on or off?

I haven't yet had my V6 Taco out in any warm weather since I just bought it late last year and it was already cold out. My other truck with a 3RZ never runs above 195 even on the hottest of the hot days in mid summer while stuck in traffic and with the AC on.

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