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Old 09-19-2021, 06:12 PM   #1
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Default Need help with over heating isuue

Hello,
Last week I bought a 1996 Nissan Pickup 4 cylinder 5 speed 4x4.
The engine over heats whenever there is a thermostat in it but runs a little cool but still a reasonable temperature when I put a thermostat in. I have already replaced the radiator, water pump, thermostat, coolant and temperature sensor. I know the engine is in fact over heating and it is not a gauge issue because it burnt up brand new plugs after running for about 30 minutes with the temp gauge 3/4 of the way up.
I tested the thermostat I used in warm water and it opened up at about 170 degrees so I don't think a bad thermostat could be the issue.
What else could possibly be causing the cooling issue? At this point I am doubting that it is cooling system related but I am not an expert on these trucks by any means.
Any help would be greatly appreciated, Thank you
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Old 09-19-2021, 09:09 PM   #2
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Welcome Evan...

Any other mods in the engine compartment? ...everything looks original? (baseline question)
Also, I think 96 was OBD2? Might plug in and see if there are any codes...
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 09-19-2021, 09:32 PM   #3
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Is the thermostat any good? Some will fail closed.
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Old 09-19-2021, 10:06 PM   #4
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Quote:
Originally Posted by 89'HBV6 View Post
Welcome Evan...

Any other mods in the engine compartment? ...everything looks original? (baseline question)
Also, I think 96 was OBD2? Might plug in and see if there are any codes...
Everything is stock and original. Its an old forest service truck so it looks very well maintained for the most part.
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Old 09-19-2021, 10:07 PM   #5
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Quote:
Originally Posted by Deerhurst View Post
Is the thermostat any good? Some will fail closed.
Thanks for the response.
I put the thermostat in water on the stove and it opened up at 170 degrees so I would assume it is opening up at 170 degrees in the engine too.
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Old 09-19-2021, 10:09 PM   #6
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When I went to the parts store to try and read any codes the tool wasn't getting any power from the obd2 port. Is there some kind of fuse or something for this port? I'm getting an intermittent service engine soon light that I assumed was from an occasional misfire from the plugs being burnt up.
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Old 09-19-2021, 10:22 PM   #7
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Quote:
Originally Posted by Evan.45 View Post
When I went to the parts store to try and read any codes the tool wasn't getting any power from the obd2 port. Is there some kind of fuse or something for this port? I'm getting an intermittent service engine soon light that I assumed was from an occasional misfire from the plugs being burnt up.
Do you have the FSM yet? Check my sig line and DL it... this will serve you well.

Should help with the diags... and don't know that I can assist more. But, wait for it... we have many other members who may have more for you.
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Quote:
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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 09-19-2021, 11:44 PM   #8
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If its opening around 170 on the stove it should be fine!



Where in OR are you?



I believe there should be a fuse for the OBD port.



When the truck is warm have you confirmed coolant flow?
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Old 09-20-2021, 12:40 AM   #9
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Quote:
Originally Posted by Deerhurst View Post
If its opening around 170 on the stove it should be fine!



Where in OR are you?



I believe there should be a fuse for the OBD port.



When the truck is warm have you confirmed coolant flow?
I'm currently living in Corvallis Oregon.

The coolant flow is visible with no thermostat but it is less visible/ looks more like swirling with the thermostat. I'm not sure if this is normal because of the restriction of the thermostat.
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Old 09-20-2021, 12:53 AM   #10
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oh youre at oregon state. cool.



how are you visually seeing that the coolant is "swirling" ?
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