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topgun129

Car Making Wierd Wizzing Noise After Changing Thermostat And Coolant T

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Hi Folks,

I'm kinda at a loss here as to why after changing the thermostat and coolant temp. sensor the car started making a weird wizzing noise after the car was running for about 5 minutes. It started fine.

As soon as I heard the noise I immediately turned off the car.

A few things...

When I pulled the hose to get to the thermostat and when I pulled the thermostat out I lost coolant, but did add some before starting the car (but I'll admit not as much as I lost). As of right now the resevoir is sitting empty. And coolant is leaking from the thermostat housing. I think I'll need that paper filter thing.

When I did the sensor I had to remove a lot of part to get to it (just like doing a tune-up kind of) but I did put everything back the way it should be.

Any ideas? Luckily I didn't see any smoke or anything dangerous happen, but I am worried that nothing serious occurred due to that wizzing noise.

Thanks for your input!

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If coolant is leaking from the TStat housing, you will need to get that fixed first. Did you use a new gasket and get it properly seated on the thermostat?

It does take a bit of patience. Now, this from the LS400 DIY tutorial...

6) Remove the old thermostat and gasket. Install a new gasket (Part #16325-62010) on the new thermostat (Part #90916-03084). Then align the jiggle valve of the thermostat to the top of the housing and insert the thermostat into the water inlet housing. http://www.lexls.com/tutorials/cooling/thermostat.html

The "wizzing" noise is you pee'ing your pants(when you saw the leak). :lol: ;) Kidding! The whizzing noise could perhaps be a cavitation noise caused by insufficient coolant in the water pump. Perhaps.

Take it one step at a time. Fix the leak then get her up to snuff on coolant and go from there.

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Could also be air trapped in the system causing coolant to flow improperly. There is a "burping" procedure to get the air out that needs to be following on a coolant refill.

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