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28th June 2019, 13:18 | #1 |
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Rover 75 Saloon & Tourer Join Date: Sep 2012
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air cion and heating
outside temperature is 12 degrees.
Heating controls set to 21 degrees. Start car from cold. Am I wasting my time by having the heating and air con on as the engine coolant temperature is below the air temperature? Am I right, you cant get the air con on without the heating on? macafee2 |
28th June 2019, 13:31 | #2 |
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Are you wanting hot air quickly after you've started the engine, is that what you mean?
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28th June 2019, 14:04 | #3 |
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28th June 2019, 18:12 | #4 |
This is my second home
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28th June 2019, 18:23 | #5 |
This is my second home
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29th June 2019, 04:26 | #6 |
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Or immediately if you have pre-heated with the Webasto parking heater
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29th June 2019, 08:09 | #7 | ||
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Quote:
My first reaction upon reading your question was: "Are you sure about that?". Did you measure both ambient air and coolant temperature using the instrument pack's facilities? In my experience, the coolant is always above the air temperature. But the answer to your question is yes, you are wasting your time having the air conditioning on ('Auto' mode) because you don't want to cool the incoming air. Simply select 'Econ' for heating. Heat is available all the time. The amount is controlled by the temperature setting. If you want to "turn it off", select a lower temperature or even 'LO'. Quote:
This is how it works. The incoming air passes over the air conditioning evaporator first. If you've pressed 'Auto' or the windscreen demist button, the evaporator will cool the air to about 4 degrees C. This refrigerated air then can take two routes. It can either be directed immediately to the vents or it can pass over the heater matrix, which is always hot (or warm in the case of your diesel! ). Usually you get a bit of both. This is how the automatic "climate control" achieves a stable and comfortable temperature inside the car, by blending cold and hot air in variable proportions. When you want hot air as quickly as possible after starting the engine from cold, use the 'Econ' mode not 'Auto'. Sorry this is a bit long-winded! I hope that I've covered all the questions that may be coming to mind but if not, please get back to me. Simon
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29th June 2019, 16:30 | #8 |
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thanks, the reason for asking is on another forum someone questioned why you would turn the air con off and my thought was :- if air temperature is well below that of the heating control you are wasting your time. Turn aircon and heater off and let the engine warm up first.
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30th June 2019, 06:56 | #9 |
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If you are using "auto" surely the air con won't turn on if it's 12 outside and your heater setting is on 21?
I presumed the auto setting used either engine heat / air con or a mixture of both as necessary to keep the air temp at 21. Surely if I go out to my car and it's minus 10, it won't start the aircon pump?
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30th June 2019, 06:59 | #10 | |
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Quote:
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Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s |
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