Question about 1997 Cadillac DeVille

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Whta size thermostat for a 97 northstar engine?

What size thermostat for a 97 northstar engine? (cadi?)

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Your engine is a 4.6 liter 281 CID V8.

There are thermostat rated for 180f or 195f for your engine,

I will select a 195f thermostat with a pressure relief poppet/valve to protect the coolant hoses.





Posted on Jul 17, 2009

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Finding over heating problem in a 97 sevill cadillac


Sounds like you covered everything.
The fans come on at 220 degrees but the engine continues to get hotter ? Have you tried running the engine with the thermostat out to check for flow and blockages ?

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97 northstar purges coolant after 50 miles tested cooling system..... i might be crazy but this thermostat before the water pump system makes no sense i think with the restriction of water to the pump


Can you explain your problem more ?
The thermostat should be at the end of the upper or lower radiator hose to block flow to the radiator. The spring must be on the engine side to get the engine heat to open.

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Need to replace thermostat, and new radiator cap. Have any instructions?


Assuming you have the Northstar engine.....

The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems), the hose connects into the housing where you will also find the water pump.

You will need to remove the air filter housing and air duct to gain easy access to the thermostat.

Remove the hose from the housing,then remove the two bolts on the flange,the thermostat can then be pulled out.

Take note of the orientation of the thermostat as you remove it.

The thermostat in the Northstar engine is a duel action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).
Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.

Don't forget the new gasket when you install your new stat, you may have to order this separately.

There is no radiator cap.The only cap is on the purge tank and these are quite cheap to buy and easy to replace.

Jun 14, 2010 | 1996 Cadillac DeVille

1 Answer

I have a 97' cadillac Deville. I found the thermostat in the lower hose just below the upper hose. Is it suppose to be in the upper? Is there a certain orientation for the new thermostat?


The thermostat in the Northstar is in the lower hose as you have stated.
The thermostat in the Northstar engine is a duel action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).
Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.
The cooling system in the Northstar does not work like the older,conventional systems, this is why most people are confused when they find the Thermostat in the lower hose.

Apr 14, 2010 | 1997 Cadillac DeVille

1 Answer

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Assuming you have the Northstar engine....

The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems), the hose connects into the housing where you will also find the water pump.
Remove the hose from the housing,then remove the two bolts on the flange,the thermostat can then be pulled out.
Take note of the orientation of the thermostat as you remove it.
Don't forget the new gasket when you install your new stat.

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I have a 94 Cadi that over heats and idles high, i


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