Burning plastic smell and white smoke inside car

my guess is a blown head gasket. I would do a compression test on all cylinders to be sure. these engines wont stand much high temperature running before blowing the head gasket. you can rent a compression tester from your local autoparts store usually for free.

white were? the exhaust tip, or other spot, long pipe, name spot?
white, is steam or OIL.
oil smells like burnt oil and takes for ever to dispate
steam is water, and smells , sweet due to 50% glycol inside.
and goes away fast.
but all Gas engines make water at all the time running as a by product of combustion and for sure on cold days, some times full time cold
due to climate effects.
does your neighbors car smoke at same time, (look)
bingo , dew point.

all gas engine smoke cold started, (steam)

so first find out what it is,
take the dip stick out of a hot engine. stalled, drip it on the exhaust
see that smoke ,smell it? that is burning oil
now you know what you have, steam or oil. smoke.

Overheat catalytic converter during your drive??????

Burnt smell after starting 2013 Chevrolet Equinox. Turned key starter turned over slowly then started drove car however strong electrical burning smell after starting pulled over seen smoke coming from under vehicle. Car wouldn't start even with a jump starter just clicking sound then nothing while horrible smell of burnt electrical from under the hood. Towed it home it just clicked once. Lights, horn, flashers dash and power locks all working fine never had any problems. Thoughts starter or ??

No problem with either mechanic

The head will be pressure checked
& you will have your answer

May be one is cracked

They can be TIG Welded

Yes

HAVE YOU NOTICED COOLANT LOSS,RECENTLY?KEEP THE COOLANT LEVELS FULL,CHECK TO SEE FOR ANY LOSS AT ALL! OIL SMOKE IS MORE BLUE THAN WHITE,BUT FUEL CAN HAVE A LIGHT BLUE SMOKE.Antifreez more whitesh with a similar smell of antifreeze.

clogged catalytic converter

shack

if the smell only comes on when the heater is on try pulling the blower motor mice like to build nests in the blower motor housing.

The Symptoms tell me it is a head gasket. A leaky or bad head gasket would cause all of the problems that you mentioned.

Burning water causes White Smoke, Burning Oil causes Black Smoke. The oil and water are mixing with the gas in the cylinders and causing it to run bad. Pull out the dipstick and look at the oil on it. Does it look like good oil? Or does it look watery and or foamy or grey colored. Open up the radiator and look inside, do you see oil?

This seems almost text book to me... I would have someone local to you to have a look at it to be sure.