Shall I leave the thermostat in or out? (156 3.0 v6) - Alfa Romeo Forum
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(Post Link) post #1 of 10 Old 12-08-15 Thread Starter
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Shall I leave the thermostat in or out? (156 3.0 v6)

Guys,

My mechanic (an Alfa specialist in whom I have total confidence) decided to take the thermostat out, when installing the 3.0 in the 156.

When I asked him why, he said that this way the engine temperature would always be on the cool side...

If I would race the car, or use it as a track-day car, I would totally agree with him, and would have no problem what-so-ever in taking the 'stat out. The thing is, I don't race the car, I use it as a "normal" (if you can call these cars normal ) street car.

So my question here, to you knowledgeable folks is, should I put the thermostat back in or not?
I must confess I'm very tempted to putting it back in, because when I get stuck in traffic the needle goes up, up and I don't want to see it go away...

PS - I live and drive in central Portugal and the temperatures have been pretty high as usual for this time of year.
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Taking the stat out to reduce running temperature doesn't make a lot of sense - you will still hit high temperatures in traffic but will run cooler at cruising speed, where it should be running fairly cool anyway due to the airflow.

Running it cool like that may also cause other problems such as the engine running at too rich a mixture.
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put it back in, it's there for a reason. It will allow it to reach normal running temperatuur much quicker, which is better for the engine.
re temp rising in traffic, it shouldn't go much over 90 ~ 100 degr.C, when the engine fan(s) cut in. Are you shure those are working (both speeds) ?
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Quote:
Originally Posted by jwq View Post
put it back in, it's there for a reason.
Agree.
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Wait until the winter, you will really wish you had a thermostat when your heater doesn't work very well.

Plus the engine will run cool, burn more fuel and wear out faster due to the oil not getting up to temperature.
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(Post Link) post #6 of 10 Old 13-08-15 Thread Starter
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Thanks guys for confirming my suspicions and backing up my arguments!

I'll put it back in at once!

By the way, the fans are working at both speeds. I have already checked it.
And the fuel consumption is, indeed a little high (obviously), or mileage low if you prefer...

More questions and doubts will follow...
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I agree as well don't take it out just put a cooler one and also consider changing your mechanic if he suggests stuff like that...
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(Post Link) post #8 of 10 Old 24-08-15 Thread Starter
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Stat is back in place!

In fact, there was a thermostat in there, but it was stuck open...

Now the car heats up nicely and when it reaches the >90 you hear the fans come on and you can see the temp gauge go back below the 90 mark! Oh and when I'm driving normally the gauge reads a "normal" temperature, instead of a cool 50/70.

Thanks for your advices guys.
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Stat fully open is ok but not optimal.
Glad to hear he did not remove it since that whould be borderline dangerous since you will not get full flow through rad
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