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Discussion Starter · #1 ·
My truck started running hot today, needle pointing at the H, it has never gone that high, it usually points below the thermometer. 05 NISMO KC with 98K miles
 

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If you remove it and drop it in some boiling water, it should open. If it doesn't, then it is bad.

The real question is: Have you ever serviced the cooling system? If not then it may be a good time to start.

If a coolant change with new Tstat doesn't help, then it could be something more extensive (water pump or the feared strawberry shake (atf and coolant don't mix well))
 

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is the Nissan thermostat different than the rest of the automotive world? most if not all thermostats are now designed to fail in the open position, not the closed. OP have you checked the coolant level?
 

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is the Nissan thermostat different than the rest of the automotive world? most if not all thermostats are now designed to fail in the open position, not the closed. OP have you checked the coolant level?
nissan is not different, they are designed to stay open when they fail... but you gotta remember if it's made by man it's gonna fail even if it's a fail safe.
 

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You would hope that it fails in the open position but if he neglected its maintance this long it may have had enought time to get corroded and seized.
 

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My truck started running hot today, needle pointing at the H, it has never gone that high, it usually points below the thermometer. 05 NISMO KC with 98K miles
did the temp rise while while moving or while at a stop light?
 

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Discussion Starter · #7 ·
Temp rose during stop and go traffic, I drive 50-100 miles/day mixed city/hwy. The reservoir tank was near empty, I filled it with 50/50 and let it "cool" for a couple of hours, then topped it off drove it again < 2 blocks needle at H A/C quits blowing cold. I have it cooling now (overnight) on ramps. Read about the "air" thread. If this was my '75 Stingray I could easily remove the t-stat. This thing looks like a beeyotch to get to (I have book marked the how to). I hope it is a 20 dollar fix. This truck already cost me 2500 bucks this year for 3/4 new rear end. What are some signs it is the water pump? The coolant looks good. I'll check the tranny fluid. What else can I check on my end before I take it to the shop?
 

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yeah what i was wondering is if it could be one hell of a bit of air and lack of coolant. my Z liked to hold air in the coolant system and if it got bad enough (sometimes the reservoir tank would show almost full still) my temp would start rising at stops and once almost hit the H in stop and go traffic. just trying to think of easy very cheep things to try for ya
 

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The Tstat is cheap, heck get a z one instead since it is a little cooler (opening temp, not its "awesome" status).

Then top it all off with 50/50 and make sure you overfill the resivour tank and massage the upper intake tube to help spped up the air purge process.
 

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Discussion Starter · #10 ·
Did the burp, must have had a bunch of air, I finished off the gallon I bought earlier. Thanks for all the help.
 
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