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First check the thermostat being stuck open causing high temp, can take out and drive to check or replace, inexpensive part. Not sure on whistle, maybe window slightly cracked or vacuum line disconnected or cracked
A whislting noise would make me suspect a cracked or broken vaccuum line. Whistling as it sucks air into the system. I would check the biggest one first, on your brake booster. It is a large line coming from the engine to the brake booster assembly located behing the brake master cylinder. I would check all the lines with engine running, have a helper rev the engine slightly while you listen in the engine compartment to see if you can locate it. Also work the brakes simultaneously. Cold weather can make older lines crack which can cause a serious problem depending on which line cracks or breaks. Check all your air lines first and see if you find it in that system before assuming something more major. A crack in other engine system lines will usually produce a fluid leak of some type.....Good luck!..Mike