My heater doesn't go cold. But to answer your question, check the engine coolant level in the radiator. Be sure that the engine is cold before removing the radiator cap. --Ken
check your oil, try putting some z-max or sea-foam in it to clean out the carbon
If I understand your question, the noise that you hear is called "piston slap". It is not exactly a click, probably closer to a knock. This goes away on my 2000 Forester after just a few minutes of running even in the coldest weather. Turn the radio up a bit and enjoy your Subaru. --Ken
if youre trying to turn the heater on and cold air comes out, then its most likely the heater core
Yes. It is an automatic test to make sure it works. It could also be your air conditioning compressor if you have the defroster on.
Because it's broken.
it's old and you need to change it.
You will have only cold air coming thru your heater ducts if your core is defective.
heater core plugged or air locked check to see if hoses going to heater core are hot
Sounds like a stuck thermostat.
Low Coolant? Bad thermostat? Heater core plugged or restricted? Heater core airbound? Heater control cable not working?
The quick answer is "Yes, cold weather affects everything that moves." Your Subaru was designed to withstand the temperature extremes that this planet experiences. Componnents that are already close to failure are placed under increased stress at temperature extremes and failure may come more quickly at those times. Does this help? --Ken
Mine gets stuck when it is cold. I just tap it(rather hard) a few times and it comes unstuck, then you have to lift the release lever again