Running Hot

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jprohn2487
Posts: 3
Joined: Tue Sep 17, 2019 7:11 am
Car: 2002 Nissan Pathfinder SE
3.5L V6
Automatic

Running Hot

Postby jprohn2487 » Tue Sep 17, 2019 10:12 pm

So, my 2002 Pathfinder is running hot. Hoping y'all can help me out. I have already replaced the radiator, water pump and front thermostat. The fan clutch tests ok (depending on your interpretation of "free spinning", it does have some resistance). It only tries to run hot when it has a load (in drive mainly). Once I start moving again it cools back down. Sometimes it will start to heat up when traveling a long distance at slow speeds (like through two of the small towns I drive through daily both of which are under 40 mph). If I'm sitting in a drive thru or at a red light I shift to neutral and that seems to help. If it does it while moving I kick on the heater and that really helps, almost stops it entirely. I should also note that I do not have a fan cover installed and the rear thermostat (please don't make me change it!) has not been touched. Any ideas?


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AZhitman
Administrator
Posts: 70230
Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 77 620 SR20, 89 Pao, 97 D21, 98 S14, 11 LS460L, 12 Titan 4x4.
Location: Surprise, Arizona
Contact:

Re: Running Hot

Postby AZhitman » Tue Sep 17, 2019 10:49 pm

Fan shroud and - YEP - change that thermostat. Flush the system while you're at it.

jprohn2487
Posts: 3
Joined: Tue Sep 17, 2019 7:11 am
Car: 2002 Nissan Pathfinder SE
3.5L V6
Automatic

Re: Running Hot

Postby jprohn2487 » Wed Sep 18, 2019 9:48 am

Thanks, I reinstalled the fan shroud (it helped a little) and I ordered the thermostat. I really didn't want to mess with the WCV... I flushed it out when I changed the other parts about a month ago. Think I should again? Also just realized this in the Quest Forum, sorry for that.

User avatar
AZhitman
Administrator
Posts: 70230
Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 77 620 SR20, 89 Pao, 97 D21, 98 S14, 11 LS460L, 12 Titan 4x4.
Location: Surprise, Arizona
Contact:

Re: Running Hot

Postby AZhitman » Wed Sep 18, 2019 3:21 pm

No worries, the advice would be the same! :)

Welcome aboard. Keep us posted!

jprohn2487
Posts: 3
Joined: Tue Sep 17, 2019 7:11 am
Car: 2002 Nissan Pathfinder SE
3.5L V6
Automatic

Re: Running Hot

Postby jprohn2487 » Sat Oct 12, 2019 3:52 pm

So I've spent a while chasing down anything and everything and found two things. The air bleed port on the back of the engine was/is not properly capped but I can take care of that easy enough. The second thing is a hose I am having trouble tracking down. It runs from the throttle body to the crossover tube and show evidence of a small slow leak. I pressure tested the system and noticed I was losing pressure at about 1/2 a PSI every 10 minutes. What hose is this? I cannot find a number anywhere. I believe this is my problem.


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