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Brettles Profile
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Date Registered: 08-2017
Location: Newcastle
TOTAL POSTS: 30
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QR25DE Thermostats


Im upgrading to an fully aluminium radiator on my exxxy and wanting to replace the thermostats now.

I know theres the 54mm 82c thermo and then the 96c 52mm, people keep telling me to scrap the 96c and replace with a 82c variant.

Can anyone please tell me a part number for the 82celsius 52mm thermostat?!?!?! PLEASE!

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2002 X-Trail Series I T30
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Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5975
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Re: QR25DE Thermostats


What reason do they tell you to replace the 96C thermostat with a 82C one ?

The 2 thermostats are for totally different parts of the engine.
The 82C thermostat controls the flow of water from the radiator by not releasing flow until the temperature of the engine cylinder HEAD reaches 82C.
The 96C Water Control Valve controls the flow of coolant through the engine cylinder BLOCK only and does not let coolant flow through it until its temperature is reached.

Reducing the 96C Water Control Valvce temperature to 82C could have the effect of not allowing the engine cylinder block to reach a satisfactorily high operating temp to drive out moisture from the lubricating oil and produce a thick sludge which could block oil channels and passages causing increased engine wear.

The 2 thermostats were designed with different temps for a reason ... don't change them unless you are willing to accept any consequences.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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Brettles Profile
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Date Registered: 08-2017
Location: Newcastle
TOTAL POSTS: 30
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Re:


I was told having the two different thermo temps can cause the head gasket to fail prematurely

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2002 X-Trail Series I T30
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BPxtrail Profile
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Date Registered: 08-2013
Location: Canberra
TOTAL POSTS: 121
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Re: QR25DE Thermostats


No, no, no.
Why do you think Nissan pays top-flight Engineers big money to design their engines?
Coz, they kind'a, sort'a know what they're doing.
These two thermostats should stay as the Engineers designed them. You'll reap no benefits from trying to out-think these guys. If operating temps are are outside the limits set by these guys (due to your replacement ideology) the results will be YOUR problem.

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2013 ST, T31 Series 5. Aug, 2013
Member X-3280
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grumblesaw44 Profile
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Date Registered: 07-2015
TOTAL POSTS: 36
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Re:


while on the Thermostat line, is there an after marking top housing/outlet?
mine was a bit daggy last time i changed the coolant, now there is a very light seep


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JC
X-4323
T30 August 2006
Near Wagga Wagga.
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5975
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Re: QR25DE Thermostats


Is the seep coming from a join or from what might be a pin-hole in the metal casing ?

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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roid Profile
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Date Registered: 05-2017
TOTAL POSTS: 81
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Re: QR25DE Thermostats


How did you go with teh new radiator?

I'm thinking of getting one of the $199 '26mm' eBay ones. $100 more than the plastic/alloy factory one seems like cheap insurance. Wondering if it cools much/any better, and fits neatly.

There's also a 40mm triple core version, for $270. That would be the go in the heat... not sure if mine will ever benefit from it however.

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05 T30 ST-X Auto
205/75x16 A/Ts on 6.5" ET40
200k: Refreshed suspension,fuel, ignition & cooling systems
Often good & dirty as is lifted 35mm on Sachs Automatics & poly bushings
Northern Sydney, NSW
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Sirkev Profile
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Date Registered: 08-2015
Location: Yanchep
TOTAL POSTS: 11
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Re: QR25DE Thermostats




Hi Brettles

I am interested in how you went with the full aluminium radiator? I am about to order one myself.

regards

Sirkev

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Kev
2007 T31 Manual petrol, 17 inch alloys, JVC 12 CD stacker in diamond white.
X-4312
9/Jan/2021, 3:01 pm Link to this post Send Email PM   Send Private Message Blog
 


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