Quicker heating in winter

Faults and Technical chat for the Vauxhall Astra K
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ultrashock
Posts: 34
Joined: Wed Mar 28, 2018 9:04 am
Astra Model: Astra K 2017 1.4T Innovation

Quicker heating in winter

Post by ultrashock » Tue Jan 14, 2020 11:33 am

Hello,

I noticed that wheni turn on the AC the car is heating quicker.
In Bulgaria now in the morning is -5 and after 2-3 min it starts blowing hot air from the vent. When the AC is turned off it takes much more longer.
Is there any system for quicker heating when the AC is turned on?
I read something about Quickheat but only for diesel engines, mine is 1.4T 2018.

Thanks!

Redman
Posts: 1059
Joined: Sat Aug 20, 2016 7:16 pm
Astra Model: Astra elite nav 150
Astra Colour: red

Re: Quicker heating in winter

Post by Redman » Tue Jan 14, 2020 1:23 pm

There appears to be 2 cooling thermostats on the 1.4t astra k. None of them appear to be MAP controlled either. This system allows the engine to heat up more quickly and allows the occupants warmth earlier. It will also aid emissions control.

From what I have worked out the engine cooling water appears to circulate around the engine block only from cold . The coolant quickly heats up opening the first thermostat (allows coolant flow to the in car heater/turbo bearing and oil cooler aswell as engine). Then when engine is up to running temp the 2nd thermostat opens to allow cooling through the radiator.

The a.c. compressor will put a bit more load on the engine and heat the water circulating around the block faster from cold. This will cause the 1st thermostat to open slightly earlier than with no ac on imo.

1st picture is 1st thermostat, built in to housing.
2nd picture is 2nd thermostat, located by water pump.

Screenshot_20200114-133332_Gallery.jpg

Screenshot_20200114-132717_Samsung Internet.jpg


Pug50
Posts: 24
Joined: Fri Dec 27, 2019 9:28 am
Astra Model: Elite ST 1.4T Auto

Re: Quicker heating in winter

Post by Pug50 » Tue Jan 14, 2020 8:19 pm

I've always thought that the AC couldn't activate at all below about 0-3°C?

If it is auto climate then it is possible that when the AC is off, it directs more air to the windscreen and blows stronger and earlier in auto mode to try to avoid the windows steaming up without the dehumidifying effect of AC. By blowing earlier and stronger, it would delay engine warmup. But that's a complete guess.

Regardless, it's pretty impressive how quickly it warms up.

astraowner
Posts: 1503
Joined: Sun Dec 02, 2018 8:54 am
Astra Model: 2016 Astra K 1.6 110HP
Astra Options: Lane assist, dual zone Climate Control.
Astra Colour: Asteroid Grey

Re: Quicker heating in winter

Post by astraowner » Wed Jan 15, 2020 10:08 am

Pug50 wrote:
Tue Jan 14, 2020 8:19 pm
I've always thought that the AC couldn't activate at all below about 0-3°C?

If it is auto climate then it is possible that when the AC is off, it directs more air to the windscreen and blows stronger and earlier in auto mode to try to avoid the windows steaming up without the dehumidifying effect of AC. By blowing earlier and stronger, it would delay engine warmup. But that's a complete guess.

Regardless, it's pretty impressive how quickly it warms up.
The climate control will not run the compressor if the temperature is low. Also i see no reason to run it at all if the car is set to 20C and the outside air is 0C
2016 Astra K 110HP, Opel Eye camera, front and rear parking sensors, dual zone climate control and heated front seats, sight and light pack.

Pug50
Posts: 24
Joined: Fri Dec 27, 2019 9:28 am
Astra Model: Elite ST 1.4T Auto

Re: Quicker heating in winter

Post by Pug50 » Wed Jan 15, 2020 1:49 pm

astraowner wrote:
Wed Jan 15, 2020 10:08 am
Also i see no reason to run it at all if the car is set to 20C and the outside air is 0C
The main reason would be to dehumidify the air so that the windows stay clear without throwing gobs of air at the windscreen.

Also, AC in the winter means that the car can be heated hotter without feeling stuffy.

But indeed - most manufacturers say the AC won't operate at all in the cold, usually saying either 3°C or 0°C as a minimum.

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