mattk
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Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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turning the heater up full on an overheating engine cools it down, fact
leaving the heater OFF on a cold engine makes it warm up quicker? I dont think it does
I dont think it makes a difference to the time an engine takes to reach temperature wether the heater is on full or off?
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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Well the only reason it cools down is because it lets water run into a different part of the engine iirc. So assuming that's correct, I can see it taking longer to heat up.
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Sportycorsa86
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Registered: 10th Dec 07
Location: hertfordshire ( cheshunt)
User status: Offline
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if u have heaters on cold then yes the engine will warm up quicker as its not venting off the hot air. same goes i they are on then it will help cool it down
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richc
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Registered: 24th Mar 07
Location: Ilkeston
User status: Offline
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Well its water tempreture not 'engine' temp as such 
It will warm up quicker as the hot air isnt being taken away in the heat box, its beein recircluated around the system, in turn making it warmer.
In a morning, i will jump in a drive for like 1 mile before i turn the heater on to let the heat get round.
But my car is old, on a newer car they just seem to work after x amount of time no matter what 
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jr
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Registered: 20th May 02
Location: Kent
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Matt arent you a plumber ?
thermostats etc
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richc
Member
Registered: 24th Mar 07
Location: Ilkeston
User status: Offline
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quote:
Originally posted by jr
Matt arent you a plumber ?
thermostats etc
IAN CHANGE THE SNOW MAN
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wakey1512
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Registered: 8th Apr 09
Location: Grimsby
User status: Offline
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some basics about cooling systems
the coolant circuit made of the following basic things, is the engine, thermostat, radiator and water pump
when cold, the thermostat is closed and the water can only circulate the engine and the pump. When the engine reaches optimum runnin temp the thermostat will open and allow the water to reach the rad and cool down
this is why leaving the heaters off in the morning makes no difference, however as you said, turning the heaters on when overheating will cool the engine down as the coolant is going to a colder part of the system
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Ben G
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Registered: 12th Jan 07
Location: Essex
User status: Offline
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my engine seems to take longer to heat up in the mornings when the heaters are on full.
don't know if this is to do with the heaters or the fact it's freezing outside.
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pow
Premium Member
Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
User status: Offline
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Yes it is Ben.
I tend to leave the heater off till I get something on the temp gauge
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mattk
Member
Registered: 27th Feb 06
Location: St. Helens
User status: Offline
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quote:
Originally posted by wakey1512
when cold, the thermostat is closed and the water can only circulate the engine and the pump. When the engine reaches optimum runnin temp the thermostat will open and allow the water to reach the rad and cool down
this is why leaving the heaters off in the morning makes no difference, however as you said, turning the heaters on when overheating will cool the engine down as the coolant is going to a colder part of the system
using my knowledge of heating systems this is what my argument was, wasnt sure if it applied to car cooling systems
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Ben G
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Registered: 12th Jan 07
Location: Essex
User status: Offline
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quote:
Originally posted by pow
Yes it is Ben.
I tend to leave the heater off till I get something on the temp gauge
i try doing that but leather and metal on the steering wheel is not a good feeling at 6am on a freezing cold morning always give up and put the heaters on 
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pow
Premium Member
Registered: 11th Sep 06
Location: Hazlemere, Buckinghamshire
User status: Offline
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I find wearing my winter coat then fighting it off at a set of traffic lights just as they go green the way forward tbh )
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sand-eel
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Registered: 15th Mar 07
Location: carluke/braidwood--IRNBRULAND
User status: Offline
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Putting the heaters on will make the water heat up slower as the heater fan is blowing cold air through the water fins.
In winter my corsa took ages to heat up properly with the heater fan on.
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LeeM
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Registered: 26th Sep 05
Location: Liverpool
User status: Offline
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if you turn the heaters on the matrix will fill up, which is in essence a mini rad (which obviously you know as you know it cools down an overheating engine)
so with water going through the matrix and cooling down, it is harder for the engine to reach temp, this is why the radiator has a thermostat to stop water circulating untill its up to temp
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