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 Posted: Tue Sep 10, 2013 2:30 pm |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi could someone tell me if a thermostat and a temperature sensor the same thing and what are there functions do they contribute to low fuel mileage
thanks sorry if its a daft question
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Posted: Tue Sep 10, 2013 2:45 pm |
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Joined: Dec 19, 2012
Posts: 365
Trade Rating: 0
Location: Sussex
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Thermostat - Its job is to block the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature (generally about 200 degrees F, 95 degrees C), the thermostat opens. By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions.
Temperature sensor is how hot the engine is
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Posted: Tue Sep 10, 2013 3:22 pm |
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Joined: Feb 07, 2010
Posts: 2949
Trade Rating: +6
Location: Athens, Greece
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^Spot-on.
Note threshold temp of the thermostat for the 206 is 89 deg C, not 95.
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| 1.4i, 2001, 3-door, China Blue
Repair safely - Drive safely | |
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Posted: Tue Sep 10, 2013 5:33 pm |
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Joined: Feb 10, 2010
Posts: 4266
Trade Rating: +4
Location: Palestine
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Well as the guys said,the Thermostat is kind mechanical item depends on the temp. of the coolant to work,so when the engine is cold,it stays closed keeping the coolant running the engine itself,so that it gets warm faster,which leads to better fuel eco.
when the coolant reach the 89 C the thermostat open,allow the coolant to run in the radiator,so it can be cooled off with air while driving,and when it's back to it's normal temp. it close again,and so on...
About the coolant temp sensor or (CTS),it's always close to the thermostat to it gives you an accurate reading to the coolant temp.,it's usually green colored,sometimes blue,and it effects the fuel mileage,as it's related to the ECU,and ECU takes readings from it,so when car is cold (as you start it in the morning),the fuel injectors will inject more fuel so the engine warm up faster,then when it's warm the inject quantity is less,so incase this sensor was faulty,you will have more fuel injected,and low mileage is the result.
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Posted: Wed Sep 11, 2013 5:33 am |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi thanks do you have any idea where i can locate the temp sensor on my 206 1.4???
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Posted: Wed Sep 11, 2013 5:36 am |
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Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks
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On my hdi it's fitted into the thermostat housing. Right hand end of engine as you look into engine bay. Follow the large top radiator hose back and it connects to it.
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Wed Sep 11, 2013 5:45 am |
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Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire
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Posted: Wed Sep 11, 2013 8:12 am |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi guys great full for the info just one last thing would you say its simple enough to change the temp sensor or would it be a bit complicated
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Posted: Wed Sep 11, 2013 3:10 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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They are both really easy but you will loose some coolant when you change them unless you drain some out first and catch it in a suitable (washing up bowl?) container. Drain some out by partially removing the bottom hose.
To make sure you are changing the correct sensor drive the car until it is hot and then remove the connector from the sensor. Removing the connector for the ECU sensor will make the engine revs change. Removing the connector for the temp gauge will cause the temp gauge to go to 0 but won't affect the engine rpm. If you disconnect and reconnect each in turn you can be certain that you are changing the correct sensor.
Note that disconnecting and reconnecting the sensors with the engine running on this model will not damage anything. However as you are new remember the engine is hot so be careful not to burn yourself and do not drain any coolant until the engine has fully cooled down.
A warning - if you are planning to change the temp sensor that sends its signal to the ECU make sure you know what it looks like because most car parts places get really confused about the sensors on the 206 and often supply the wrong one. It might be worthy taking a picture although ordering by telling them what colour the sensor is should get you the right one! Peugeot main dealers will always supply the right one but that might be a bit more expensive that a parts supplier.
Finally, if your 1.4 does not have aircon you will not have sensor 2 shown in 7.1a above.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Wed Sep 11, 2013 3:15 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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The pics supplied by Macca are from the Haynes manual. These manuals aren't perfect for every jobs but for simple stuff are usually perfectly adequate and walk you through each job. Buy one they are worth the £16 that they cost.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Wed Sep 11, 2013 3:33 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Is yours a 1.4 8V petrol engine as this is NOT economical in the first place. I don't know anyone with a 1.4 auto but my daughters 1.4 8V manual only did 31(ish) mpg and that was on regular 5 - 7 mile short journeys with the first 3 or 4 miles clear (NOT start / stop) traffic. She now has a 1.6 Clio and the same journeys in that car and it returns 34.5mpg and she drives it faster than she did in her Peugeot.
I would expect more than 20mpg from your auto but I would be surprised if you manage to get 30mpg from your auto on short runs!
In summary the car may not do as many mpg as you expect even when everything is working perfectly.
Also note that it might be worth getting a compression test done. You may be chasing the wrong fault.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Thu Sep 12, 2013 7:47 am |
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Joined: Sep 16, 2011
Posts: 32
Trade Rating: 0
Location: Devon UK
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| kandlbarrett wrote: |
Is yours a 1.4 8V petrol engine as this is NOT economical in the first place. I don't know anyone with a 1.4 auto but my daughters 1.4 8V manual only did 31(ish) mpg and that was on regular 5 - 7 mile short journeys with the first 3 or 4 miles clear (NOT start / stop) traffic. She now has a 1.6 Clio and the same journeys in that car and it returns 34.5mpg and she drives it faster than she did in her Peugeot.
I would expect more than 20mpg from your auto but I would be surprised if you manage to get 30mpg from your auto on short runs!
In summary the car may not do as many mpg as you expect even when everything is working perfectly.
Also note that it might be worth getting a compression test done. You may be chasing the wrong fault. |
I would have to disagree with you there on the fuel consumption. Mine is a 1.4 8V and I regularly get 40 to 43 mpg, my journeys are mostly 15 miles plus on a mixture of minor and A roads. I fitted a new thermostat a while back which did marginally help the consumption.
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Posted: Thu Sep 12, 2013 3:56 pm |
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Joined: Feb 10, 2010
Posts: 4266
Trade Rating: +4
Location: Palestine
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Posted: Thu Sep 12, 2013 4:10 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Perhaps it is the longer runs and a more gentle right foot!
There is a thread here specifically on consumption and the 1.4 8V does not do well.
My daughters also had a new thermostat and that improved mpg by about 3 mpg and being an ex mechanic is was maintained faultlessly.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Fri Sep 13, 2013 5:31 am |
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Joined: Sep 16, 2011
Posts: 32
Trade Rating: 0
Location: Devon UK
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| kandlbarrett wrote: |
Perhaps it is the longer runs and a more gentle right foot!
There is a thread here specifically on consumption and the 1.4 8V does not do well.
My daughters also had a new thermostat and that improved mpg by about 3 mpg and being an ex mechanic is was maintained faultlessly. |
Yea could be, but the worst I have ever had is about 37 mpg and that was after giving it a good thrash. Could be to do with mine being a newer one with electronic throttle etc. as opposed to the older cable throttles? But as most people on here would agree that keeping it well serviced, right oil, plugs etc. is the best way to maintain good fuel consumption.
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