Question about 1989 Nissan Hardbody King

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I need to replace thermostat on my 1990 4 cylinder Nissan 4X4

I need a drawing or schematic that shows me where it is on the engine. I think I may have to remove the power steering pump to get to it. Can you help.

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  • rmpayne Dec 15, 2008

    techgurus answered my question and gave me what I needed. LeeCom 72 sent me on a wild goose chase. Only question I had for techgurus is whether or not I will have to remove the power steering pump to get to the thermostat housing.

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Hi and welcome to FixYa,

Nissan does it a bit differently from most manufacturers. To find where the thermostat is, follow the lower radiator hose. It will end in a L form housing/cover with 3 retaining 10mm bolts. The L-form is the thermostat cover.
I need to replace thermostat on my 1990 4 cylinder - d08868e.jpg
Underneath that housing/cover is the thermostat as shown below.
2f962de.jpg
Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 15, 2008

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Definitely all you have to do is follow the TOP hose (radiator) to the thermostat assy on the top of the motor. You will have to use a little dexterity but I doubt you will have to remove the power steering pump. Then unbolt the assy and remove. Drain radiator first. Always do this when the motor is cool. After you remove the assy( sort of oval with two bolts one on each side) then clean thoroughly the surface on the assy and the area on the motor block. Use a razor blade flat knife to cut off all old gasketing and then sandpaper to lightly clean if necessary. Be sure not to nick the aluminum anywhere as a good seal must be made on reassembly.By the way make a note of how the old thermostat comes out so the new one goes in exactly the same way.Know get all parts and new gasket ready and reassemble taking care to tighten carefully as aluminum can strip easily. Refill your radiator after reassembly with a good premix made for your motor. It is PROBABLY the old green fluid. Check for leaks and then top off radiator after a day or so of driving. And there ya go just saved yourself $$$ and you know it was done correctly.

Posted on Dec 15, 2008

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This component is practically located towards the top of your vehicle engine, right in the outlet going to your vehicle radiator. However, in some cases, the thermostat is mounted towards the bottom of the engine near the inlet to the engine. Wherever you mount it, it works the same.

youll need silicone, the gasket and the thermostat

drain the motor and rad of coolant

remove the hose on your pass side and the 3 bolth that holds it on (thermo Housing) i think its 3 12mm bolts

swap thermos , gasket it silicone it and replace the housing put the hose back on good to go

Posted on Dec 15, 2008

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You need to remove the three bolts at the base of the pump.

Follow the procedure here: How do you replace the thermostat on a 1993 Nissan

Posted on Dec 15, 2008

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Ollow the lower radiator hose to the casting covering the thermostat on the front of the motor. This casting is directly underneath the power steering pump. There are three bolts holding the casting onto the block. You will need to use a 10-mm wrench to remove the three bolts. Once you remove the casting, you will have access to the thermostat. You may need to use a pair of pliers to remove it from the block. Once it is removed, there will some anti-freeze that will pour out of the block, so be prepared for the spillage.
Before installing the new thermostat, you should clean the surface of the block and the surface of the casting that you removed, to make sure that both surfaces are clean and smooth to ensure a good seal when bolted back together. You should apply a small amount of high-temperature sealant on the surface of the block and follow the instructions on the sealant regarding proper application and drying times. After doing all of the above, you need to look at the new thermostat and find a small metal pin that will wiggle when you shake the thermostat. This is called the "wiggler". It is used as a vent. The thermostat should be installed with this "wiggler" at the top. After installing the thermostat into the block, re-mount the casting over the thermostat and tighten the three bolts evenly to allow the casting to secure flat to the block. Reconnect the hoses and re-fill the cooling system. 

Posted on Dec 15, 2008

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Hello there
Have a look at this web page, it gives step by step instructions and pictures of your thermostat location and how to replace it.

http://forums.nicoclub.com/zerothread?id=324954&postid=4182091

Kind regards

Posted on Dec 15, 2008

  • Lee Hodgson
    Lee Hodgson Dec 15, 2008

    you don't have to join the the site just scroll down the page the information you want is on that page
    here is the web address again just in case

    http://forums.nicoclub.com/zerothread?id...

    regards

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