Havc has a mind of its own
01-10-2017, 08:22 PM
#11
Senior Member
Thread Starter
The HVAC does certain things on its own to regulate temperature and humidity. If you have your defrost on, it kicks on the AC compressor to dry out the air. If it's cold in the cab and you have the heat on, it can switch to recirc mode whether you like it or not until the temperature goes up. I also think, at least with my 2.7, it keeps it in recirc mode when the engine is cold until it's warmed up a bit so the engine can warm up faster. Cold outside air running through the heater core will make the coolant colder which will make it take longer to warm up.
01-10-2017, 08:43 PM
#13
Some thoughts
With just the floor selected, air will come out both the floor and a bit out the windshield defrost
If you select vent and floor, then none will come out the windshield defrost. To get floor only, (so air is not hitting me in the face), I use the vent and floor settings and manually close down the vents.
I don't like this, but am learning to live with it. Very rarely does it come in handy to have a little coming out the windshield defrost and floor at the same time.
My biggest gripe is that very little ever comes out the Center console at the back seat. Does anyone else have a problem with weak center console airflow?
If you select vent and floor, then none will come out the windshield defrost. To get floor only, (so air is not hitting me in the face), I use the vent and floor settings and manually close down the vents.
I don't like this, but am learning to live with it. Very rarely does it come in handy to have a little coming out the windshield defrost and floor at the same time.
My biggest gripe is that very little ever comes out the Center console at the back seat. Does anyone else have a problem with weak center console airflow?
01-11-2017, 08:37 AM
#16
The HVAC does certain things on its own to regulate temperature and humidity. If you have your defrost on, it kicks on the AC compressor to dry out the air. If it's cold in the cab and you have the heat on, it can switch to recirc mode whether you like it or not until the temperature goes up. I also think, at least with my 2.7, it keeps it in recirc mode when the engine is cold until it's warmed up a bit so the engine can warm up faster. Cold outside air running through the heater core will make the coolant colder which will make it take longer to warm up.
01-11-2017, 09:00 AM
#17
Senior Member
The HVAC does certain things on its own to regulate temperature and humidity. If you have your defrost on, it kicks on the AC compressor to dry out the air. If it's cold in the cab and you have the heat on, it can switch to recirc mode whether you like it or not until the temperature goes up. I also think, at least with my 2.7, it keeps it in recirc mode when the engine is cold until it's warmed up a bit so the engine can warm up faster. Cold outside air running through the heater core will make the coolant colder which will make it take longer to warm up.