2007 Altima - How many coolant thermostats are there? - Nissan Forum
 
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post #1 of 7 Old Apr 20th, 2016, 01:49 PM Thread Starter
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2007 Altima - How many coolant thermostats are there?

Hello guys! I just recently received a P0128 error code on my 2007 Nissan Altima 2.5S and was wondering how many coolant thermostats are there? Nissan tells me, there is one but I have seen schematics showing there is two. I recently had my car serviced at a Nissan dealership and they have replaced one thermostat and re-filled coolant. However, a week and half later, the SES light came back and code P0128 was again detected.

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post #2 of 7 Old Apr 20th, 2016, 02:57 PM
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the thermostat is on the side of the engine, there is what they call a "water control valve" (which looks like a thermostat) on the back of the engine... if that helps
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post #3 of 7 Old Apr 20th, 2016, 03:02 PM Thread Starter
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Thanks Speedo. Would that need be replaced as well for a P0128 considering that it's for the water pump? I would imagine the primary would be the coolant thermostat.
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post #4 of 7 Old Apr 20th, 2016, 03:03 PM
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post #5 of 7 Old Apr 20th, 2016, 03:42 PM
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Quote:
Originally Posted by Ronin_wars View Post
Would that need be replaced as well for a P0128 considering that it's for the water pump? I would imagine the primary would be the coolant thermostat.
There are two thermostats. The main one feeds the radiator. The second one is called a water control valve which feeds several accessories such as the heater and oil cooler; it's purpose is quicker warmup for the accessories. If it's stuck closed, it could possibly cause overheating.

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post #6 of 7 Old Apr 20th, 2016, 04:30 PM
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Misdiagnoses? If P0128 was what the repair was intended to fix then return to dealer for a redo. ECT sensor maybe miscalibrated.
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post #7 of 7 Old Apr 20th, 2016, 05:46 PM Thread Starter
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@rogoman - Thank you. Had no driveability or overheating issues since the engine light and code came up. But that second sensor by water control valve maybe a culprit The only thing that was changed by me was the Coolant sensor @cj1 it was an aftermarket part. A mis-calibration is something for Nissan to check as well. Thank you both!
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