What is this and why does it blow hot air

TheBandit704 said:

It's a vent for the smog system that use to have a flexible aluminum tube that went out the hole right there in the metal inner support for the fender.

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Its the muffler for the smog system, and ive never seen it have a tube on the outboard end. On 100s of these trucks.

The plastic "coffee can" is the air inlet filter. The metal coffee can is a vacuum reservoir. The black box below the battery is the charcoal canister and it traps fuel vapors from the tank, and releases them into the intake when under load.

JScatt said:

My 95 has it maybe it’s a 94-96 thing

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I got my 94 in 2003 with 72k miles and there was no sign of one.

JScatt said:

I’m talking about the plastic tube that goes towards the radiator

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Thats the inlet for the air filter for the smog pump. Thought you were talking about a tube from the smog pump muffler.