check the coolant in the radiator it may be low.
A cold breeze blew every morning?
the cold breeze starts at land, when it is at sea it becomes warm. Then it blows back to land where it becomes cold again
Blowing out moisture is a sign that the heater core is leaking. Starting out hot and turning cold could be low on coolant.
The four types of breezes are land breeze (blows from land to water at night), sea breeze (blows from sea to land during the day), mountain breeze (cold air descending from mountains at night), and valley breeze (warm air rising in valleys during the day).
Colder air blowing in from the sea to the land is called a "sea breeze".
SAE 10w30 is a good all around choice. Possibly 5w30 in extremely cold climates.
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
The heater blend door is vacuum actuated. You have a vacuum leak somewhere.
the climate in mexico is hot in the smmer but if there is a cold breeze during the summer thtn it is really cold in the winter. But if there is not a cold breeze and its just like light thatn there winter wont be as cold as it would with the cold breeze.
checked antifreeze level???
You will need to replace the rear expansion block valve and the recharge the system with freon and oil..............
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul