Not sure why heating up the air going into the intake is a good idea, but the TBHP is a common failure part, as well as the lines that go to/from it. Anyone see a reason you couldn't snip-snip and connect them by the alternator or something? 1 less thing to worry about.

 

Not recommended in cold weather climates. It keeps your throttle body from freezing and causing your throttle to stick wide open.

 

Certainly is of no use in south Georgia in the summer. But it is said that ice-up can happen slightly above 32F with right humidity. On the other hand, I can't recall my IAT sensor ever showing temps in that range....

BTW many Mercedes have hot water loop that also goes thru the wind shield washer bottle, so that won't freeze on the Autobahn...

 

I by-passed it on my '02 last spring so come winter stay out of my way!!!

 

Just don't see the TB getting that cold under the hood. Has anybody even heard (1st hand) of the TB actually freezing?

 

Maybe they did not live to tell about it.... or it prompted them to buy another vehicle.

 

Well, I won't eliminate it now, but when (not "if") this one gives me any crap, I'm bypassing it. I'll just reinstall the original 190F thermostat!

 

It doesn't have anything to do with the temperature of the engine. At part throttle there is a pressure drop as air approaches and passes the butterfly valve in the throttle body. Any pressure drop also causes a temperature drop. That temperature drop along with moist air can cause icing. It can happen well above freezing if the conditions are right.

The MAF uses temperature as a means of determining the mass of air being drawn into the engine. The reading on the scanner is not a good indication of the actual temperature inside the throttle body.