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I am having heater issues on my 95 Cirrus with 2.5 V6 engine. Last night it was below 20 degrees outside, and the heater wasn't producing air hotter than 60 degrees or so. Brrr. I checked to see if the heater core was possibly clogged. Then I came accross something new to me different from any other car I have worked on. Normally, there is a valve that turns off the coolant flow to the heater core when heat isn't selected. On my car however, BOTH hoses on the heater core were equally as hot as the engine when the thermostat knob was on cold. When I selected heat and turned the fan on high, I observed that one of the hoses had cooled down, but not as much as I expected since it was so cold outside. So... how does this system work? Is there not a valve that turns off the coolant, or is something wrong? Also, air flow greatly decreases when heat is selected. It's weird, but air doesn't come shooting out of the vents on heat like it does cold. Someone enlighten me please. Winter is starting here. HELP! Thanks 