Tip & How-To about 1999 BMW 3 Series

Thermostat housing

Replace the thermostat housing with an aluminum aftermarket.

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I have a 502 big block chevy motor in a 1963 nova with a aftermarket northern aluminum radiator & 195 degree thermostat. On a 90 to 100 degree day the motor slowly heats (20 minutes of running or more) up over 130 degrees. Everything is new. Is radiator to small? Do I need higher temp thermostat?


A thermostat should only allow flow after reaching its desired temp, 195, however, if this is just idling and you have a brand new aluminum 4 core radiator then it may really not be reaching temp and reading low because of no load and a great radiator. I assume top of the intake manifold is where your temp sender is? Did you use a laser infra red temp reader and point it at the block in several spots? You may see175, 185, etc all over the side of the eng. The neck of the thermostat housing should be the closest to 195 but the lower hose might read 140 / 150. Alum radiators work awesome so when that thermostat does open it's a rush of cooler coolant. What is it doing when you drive steadily @ 40 - 50 mph? If the gauge reads say 140 and just fluctuates slightly from that then I would say yes, replace the thermostat. If your gauge shows it now reaching temperature then it's just that your radiator is doing a helluva job when it idles. BTW, electric fans? On a switch or temp sender? Or mechanical fan always pulling air even at idle?
Hope this helps

Jan 26, 2018 | Cars & Trucks

1 Answer

replace thermostat


follow upper radiator hose to aluminum housing this is where the thermostat is. be sure engine is cool remove radiator cap or reservoir cap if no cap on radiator disconnect upper hose from thermostat housing. remove two bolts in housing and remove housing. replace thermostat and reassemble. when finished refill anti- freeze leave cap off and start vehicle with heat on high. run the vehicle like this until air stops bubbling out of coolant and heat is hot steadily. continue topping off coolant during this process and be sure cooling fans engage before completion. then youre all done

Sep 19, 2012 | 2000 Pontiac Grand Prix

1 Answer

how to remove the thermostat?


follow the top rad hose to the engine under the housing you will find the tstat usualy with two bolts remove and gently pry the housing up and away replace the thermostat clean away all gasket material and sealents install new gasket and reinstall housing crefull that the housing seats flush on the block do not go crasy tourquing the bolts down this is usualy an aluminum housing and will break easily

Mar 07, 2011 | 1984 Chevrolet Blazer

1 Answer

where is the thermostat on a 1996 cavalier 2.0


on the engine side at the end of the top radiator hose is an aluminum thermostat housing held down with two bolts remove it and replace thermostat.don't forget gasket as well. always do this when engine is cold.

Jan 09, 2010 | 1998 Chevrolet Cavalier

1 Answer

how do I change the thermostat on a 6 cylinder nissan frontier truck


Hello Wayne...the thermostat on your truck is located on the engine under the thermostat houseing. It is positioned in a fairly tight place. It can be replace with regular hand tools, ratchet extension, swivel socket and wrench. Follow the radiator hose to the thermostat houseing to locate. I suggest you replace it with a Nissan thermostat, they seem to last longer than an aftermarket, and come with a new houseing. Enclosed is a picture of the houseing you will be removing.
Make CERTAIN you install the new thermostat in the correct position...if installed backwards it will NEVER open and your engine will overheat in minutes possibly causeing severe damage.
Good luck..i hope this helps, please take time to rate me a fixya.
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Jul 15, 2009 | 2002 Nissan Frontier Crew Cab

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