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1990 Nissan D21 thermostat problem


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monsiep
User

Jan 21, 2018, 6:44 AM

Post #1 of 7 (119 views)
1990 Nissan D21 thermostat problem Sign In

Hello, I bought this old Nissan a couple of years and it had a broken radiator. At the time someone told me it might be the thermostat so i tried to replace it but when i followed the upper hose I found no thermostat or housing. That same person then told me maybe they took the thermostat out so I kinda said meh and left it and replaced the radiator and it never bothered me because I was in a warm climate. Now I'm back in the cold and am looking to replace it and I noticed what looks to be the thermostat housing connected to the lower radiator hose. Is it possible someone switched them up? Or is this just the way it is on this vehicle. Any help would be greatly appreciated. Thank you.

https://imgur.com/a/8u8ue
https://imgur.com/a/iRT6M

I took some pictures in haste before running out. I can take more if necessary. The second picture is of the suspected thermostat housing. The first is of the setup. The upper house goes directly into the engine there's no spot the thermostat could fit that I can see.


(This post was edited by monsiep on Jan 21, 2018, 6:51 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jan 21, 2018, 9:27 AM

Post #2 of 7 (97 views)
Re: 1990 Nissan D21 thermostat problem Sign In

2 engines available sport, which one? The 2.4 cyl. one should look and be available like this housing and all. Trouble is this is both old and studs probably but any way it's fastened to engine right where upper radiator hose attaches will be a corrosion battle and risk breaking things over a guess that this is the problem at all. You can test it without touching them and suggest you do first,
Items look like this..........

You'll need a new gasket and scrape old one off or out as needed,


T



Tom Greenleaf
Ultimate Carjunky / Moderator
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Jan 21, 2018, 9:35 AM

Post #3 of 7 (93 views)
Re: 1990 Nissan D21 thermostat problem Sign In

Sorry for two posts in case you already read the first. Your pictures aren't even of a thermostat area! This is generic and the most common way to do one in as short of a video as I could just find,


> https://www.bing.com/...amp;&FORM=VDRVRV <
Good luck. Trouble is you may not need it as said and bust stuff up trying,


T



monsiep
User

Jan 21, 2018, 10:46 AM

Post #4 of 7 (83 views)
Re: 1990 Nissan D21 thermostat problem Sign In

Okay yeah that's the housing I'm talking about just my photo is a terrible angle. I already have the gasket. I guess my question is as it's set up now the lower radiator hose runs to the thermostat. Shouldn't it be the upper radiator hose that connects to it just like in the video?

Thanks for the response.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jan 21, 2018, 11:25 AM

Post #5 of 7 (79 views)
Re: 1990 Nissan D21 thermostat problem Sign In

You still didn't say which of 2 engines possible? No matter if you want to check this you could with an infrared, touchless thermometer or your hands most of the time. From cold feel the neck or hose near what was shown starting from a totally cold engine. Now just wait a few minutes it should STAY cold, eh, might move up away towards radiator and feel there for temp full circle of the hose not sure what angle it might be on?


When it reaches its rating for full temp marked on thermostats always should use what manufacturer suggested new nothing lower unless it's listed as correct OE as if truck was new.
If it waits then slowly warms up it's almost certain that isn't the problem. Other reasons for total confusion with cooling temp anything is it leaks, can't hold pressure or system is low must be known and you'll need to know how to fill a system such that no air is inside the pressured up side of the system when warm. If no pressure ever stop this and find where it's leaking may even be a radiator cap.


If you insist on doing this keep that video and watch the next as well is longer. You may need a gasket scraper and a tool to remove hose if really stuck on the neck. Right now even if you don't take this on put some PB solvent on a Q-Tip and soak the threads of nuts, bolts that hold housing onto engine.
What was shown was about $32 bucks and NOT available at Autozone I used for the picture - didn't know which engine and they can be wrong or others.
Make sure if doing this thermostat if possible to install upside down isn't! If this mounts to the side you either use just some "Form-a-Gasket" by Permatex to glue it in place if it falls crooked will just flow all the time or leak. Other is use fine wire used commonly for flower arrangements or just real fine wire you can loop the thermostat running wire up to end of upright metal housings and bend it such that it can't move while installing quickly so nothing goes out of place. The wire used should be able to pull out cleanly if you follow me on that?
I'll save how to fill the dang system or end up writing 5 pages here. See if it works first but you must also know system is full and can hold pressure or wait to mess with this. Temp by infrared thermos shouldn't really ever exceed the rating of the thermostat that's inside there now once up to full temp on a RWD belt driven fan type engine or there's more to figure out/diagnose what is wrong.
Up to you. This is either simple as it gets for an experienced tech or a wild bitch busting stuff and really making troubles you don't have now,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 21, 2018, 6:38 PM

Post #6 of 7 (66 views)
Re: 1990 Nissan D21 thermostat problem Sign In


Quote
I guess my question is as it's set up now the lower radiator hose runs to the thermostat. Shouldn't it be the upper radiator hose that connects to it just like in the video?


No, many cars put them in the return hose, especially Japanese cars.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 22, 2018, 2:17 AM

Post #7 of 7 (59 views)
Re: 1990 Nissan D21 thermostat problem Sign In

Yes - can be and use the type thermostat used to direct the temperature to it. Everything is on a hunch with this maybe just let a real mechanic suggest what you need in person is the best thing to do. Old as it is you are losing some exact web info and beginning to make parts harder to find or wait for them. Find engine size is primal of course. IDK, one of these around those years used 2 spark plugs per cylinder on the 4 cyl as I recall on opposite sides of the engine. VIN # is telling of just what this is if not altered?


T







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