Login  |  Register
Nissanhelp.com - All About Nissan
Do-It-Yourself Maintenance Owners Manuals Recalls/Campaigns Service Bulletins Service Manuals Nissan OBDII Codes Glossary & Acronyms More...
Member's Ride Photos Stock Photo Gallery
Classifieds - For Sale Classifieds - Wanted To Buy Classifieds - Mechanic Wanted Classifieds - Auto Services Search Auto Parts
Register FAQ Social Groups Mark Forums Read
Water Control Valve question Forums > > Water Control Valve question Water Control Valve question
Forgot Password? Join Us!

Sentra Nissan Sentra Discussion Forum

Thread Tools Display Modes
Old 02-24-2019, 01:04 PM
Edward Edward is offline
Registered User
2003 Sentra
Join Date: Sep 2018
Posts: 8
Default Water Control Valve question

Would somebody please tell me what does the water control valve do and where is it on the 2003 Sentra. This is not the thermostat. I would really appreciate the assistance.
Reply With Quote
Old 03-23-2019, 12:27 AM
Howard Bell Howard Bell is offline
2011 Versa
2017 Altima SE-R
Join Date: May 2018
Posts: 43

Actually it IS a stat just like the other one. Nissan likes to use one on both ends of the major engine cooling circuit, likely to promote a faster warmup to go to closed loop slightly faster, it lowers emissions.

One stat takes water off the lower rad hose to go INTO engine, it is NOT the main one, only the supply one, which opens around 180ish in temp. The other one is to the top rad hose coming OUT OF the engine and is the normal stat as envisioned on all old school cars. That one is the one that actually regulates the engine temperature provided the other has opened up correctly. It works at like 195+ F or so.

BOTH are thermostats, one opens before the other to always have coolant ready when needed for the actual regulating one. Nissan to make things worse tends to call them the opposite thing. The higher temp one is for sure the actual thermostat there. They don't call both thermostats as that causes confusion when looking up parts. Like the difference in a muffler and resonator, both are actually mufflers but they have to be able to tell the parts apart to avoid mistakes.
Reply With Quote
Old 03-28-2019, 01:04 PM
smj999smj's Avatar
smj999smj smj999smj is offline
Master Enthusiast
2006 Pathfinder
2003 Frontier King Cab
2003 Frontier KC SVE 4x4
Join Date: Jun 2012
Location: Prospect, VA
Posts: 1,849

I believed the two thermostat set-up was only used on the QR25DE engine in the Sentra, not on the MR18DE. Here's a link to a part diagram for the QR25DE to show the locations of the two thermostats:

2003 Nissan Sentra Water Pump, Cooling Fan & Thermostat
Reply With Quote


control, question, valve, water

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -8. The time now is 03:19 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO v2.0.42 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.