Dosn't seam to be a wiring fault/fuse. Is the temp sensor going a regular problem on these and how do I fix it. Is it a case of getting a new temostat/sensor from VW.Dose any one have the part numbers?
Cheers
Si
Temp sensor
Temp sensor
Ok the temp sensor on our car dosn't read anything... at all. The car still runs fine and she get's warm air Dosn't seam to be a wiring fault/fuse. Is the temp sensor going a regular problem on these and how do I fix it. Is it a case of getting a new temostat/sensor from VW.
Dose any one have the part numbers?
Cheers
Si
Dosn't seam to be a wiring fault/fuse. Is the temp sensor going a regular problem on these and how do I fix it. Is it a case of getting a new temostat/sensor from VW.Dose any one have the part numbers?
Cheers
Si
-
bstardchild
- Moderator
- Posts: 3057
- Joined: Sun Mar 28, 2004 9:53 pm
- Location: Norfolk - "Its just Black & Dirty"
If I've got this right
- Your dash display isn't
- Your car still seems to be running at a sensible temp cos you are getting hot air out of the heater?
Simple check - find the dash display sensor - it's a single wire one in the water system somewhere (normally close to the ECU one - but that will be more than 1 wire)
Unclip the wire and with the ignition on ground it to part of the engine - the temp guage will go into the red so showing it's not a wiring fault but a sensor/connection failure
IHTH
- Your dash display isn't
- Your car still seems to be running at a sensible temp cos you are getting hot air out of the heater?
Simple check - find the dash display sensor - it's a single wire one in the water system somewhere (normally close to the ECU one - but that will be more than 1 wire)
Unclip the wire and with the ignition on ground it to part of the engine - the temp guage will go into the red so showing it's not a wiring fault but a sensor/connection failure
IHTH
I'll have a look a the weekend when I get five minutes -
bstardchild
- Moderator
- Posts: 3057
- Joined: Sun Mar 28, 2004 9:53 pm
- Location: Norfolk - "Its just Black & Dirty"
-
Christian6N
- Getting There!
- Posts: 84
- Joined: Sat Sep 20, 2003 9:32 pm
- Location: Germany
- Contact:
Hmmm.....so we have three mk4 Polos in our Family.
Two of them has brandnew temp-sensors.
In 2001 mine was out of order suddenly and the engine (1.6 6V AEE)won´t start because the sensor can break in two different ways. First it can make a short circuit inside and secend it can break the contact inside complete.
The first would mean the highest current and the secend would mean absolutly no current.
Hmmm....sorry, i forget to mention that the mk4 Polo has 2 tempsensorsresistors in one body.
One for the ECU and one for the Dials.
In my case the one for the ECU was broken and the ECU thought it was very very cold outside and pumped more fuel than air into the engine and so it won´t start because it was a too fat fuel/air mix.
But the second resistor for the dials was ok and showed me 90degrees because 2 minutes before i turned off the warm/hot engine.
I realy had strange problems to find out this, but first the automobilclubangel came and blowed my engine away with his starthelpspray
So the garage repaired all together.
And 3Weeks ago from today my sister had the same Problem with hers (1.4 8V AEX).
Her car won´t start too.
After changing the spark-plugs and checking other stuff i pulled the connector from the tempsensor and the car suddenly started very good without any problems.
Like i said, without the sensor. (we fixed the old sparkplugs again, they were all right)
I drove the car to our house so that we can change the sensor much better the next day.
While i drove the car this 2miles the engine and so the water became hot but the ECU still got no new informations from the sensor that the engine becomes hot because it wasn´t connected.
So the exhauts were very bad and very dark.
And the car became slow.
So after changing the sensor the next day this problem was history finaly
Changing the sensor needs a few seconds, very easy.
Watch this and read the text under it:
Hold the new sensor ready by your side.
Push onto the Sensor 2 and pull 1 and lay it down somewhere. Then take the the sensor in the other hand, pull the old one 2 and then very fast stick in the new sensor. Then stick in 1 again and thats all.
You will loose only a little bit of water in this few seconds.
Only do it when the engine it cool.
That was how to change the complete sensor.
You need a circuit diagram? I dunno which engine you have, heres one from the 1.4 8V engine, so the MPI AEX or AKV. But thats the same on the most 8V engines in the mk4.
But thats the plan fro the electric before 5/97, tell me if this isn´t the correct plan.
http://home.arcor.de/claudio.trapatoni/8V.pdf
But not like somebody else said only one wire...there are 4 wires, because one body = two sensorresistors inside = 4 wires.....
It is "G2" on the third side in this pdf.
3 and 4 in the Pic above are the problemmakers No1 in the mk4 Polos coolingsystem. Theres a fault when the water won´t become warm and also the heater only blows cold air.
But thats another story which i won´t write now because it is late, perhaps another time.
So if there are still any questions....ask.
I think when your engine makes no probs and the water becomes hot but the pointer in your dials won´t move.....change the whole sensor....in my opinion!
And sorry for my bad english....i try to speak7write it better.
Greets from Germany
Christian6N
Two of them has brandnew temp-sensors.
In 2001 mine was out of order suddenly and the engine (1.6 6V AEE)won´t start because the sensor can break in two different ways. First it can make a short circuit inside and secend it can break the contact inside complete.
The first would mean the highest current and the secend would mean absolutly no current.
Hmmm....sorry, i forget to mention that the mk4 Polo has 2 tempsensorsresistors in one body.
One for the ECU and one for the Dials.
In my case the one for the ECU was broken and the ECU thought it was very very cold outside and pumped more fuel than air into the engine and so it won´t start because it was a too fat fuel/air mix.
But the second resistor for the dials was ok and showed me 90degrees because 2 minutes before i turned off the warm/hot engine.
I realy had strange problems to find out this, but first the automobilclubangel came and blowed my engine away with his starthelpspray
So the garage repaired all together.
And 3Weeks ago from today my sister had the same Problem with hers (1.4 8V AEX).
Her car won´t start too.
After changing the spark-plugs and checking other stuff i pulled the connector from the tempsensor and the car suddenly started very good without any problems.
Like i said, without the sensor. (we fixed the old sparkplugs again, they were all right)
I drove the car to our house so that we can change the sensor much better the next day.
While i drove the car this 2miles the engine and so the water became hot but the ECU still got no new informations from the sensor that the engine becomes hot because it wasn´t connected.
So the exhauts were very bad and very dark.
And the car became slow.
So after changing the sensor the next day this problem was history finaly
Changing the sensor needs a few seconds, very easy.
Watch this and read the text under it:
Hold the new sensor ready by your side.
Push onto the Sensor 2 and pull 1 and lay it down somewhere. Then take the the sensor in the other hand, pull the old one 2 and then very fast stick in the new sensor. Then stick in 1 again and thats all.
You will loose only a little bit of water in this few seconds.
Only do it when the engine it cool.
That was how to change the complete sensor.
You need a circuit diagram? I dunno which engine you have, heres one from the 1.4 8V engine, so the MPI AEX or AKV. But thats the same on the most 8V engines in the mk4.
But thats the plan fro the electric before 5/97, tell me if this isn´t the correct plan.
http://home.arcor.de/claudio.trapatoni/8V.pdf
But not like somebody else said only one wire...there are 4 wires, because one body = two sensorresistors inside = 4 wires.....
It is "G2" on the third side in this pdf.
3 and 4 in the Pic above are the problemmakers No1 in the mk4 Polos coolingsystem. Theres a fault when the water won´t become warm and also the heater only blows cold air.
But thats another story which i won´t write now because it is late, perhaps another time.
So if there are still any questions....ask.
I think when your engine makes no probs and the water becomes hot but the pointer in your dials won´t move.....change the whole sensor....in my opinion!
And sorry for my bad english....i try to speak7write it better.
Greets from Germany
Christian6N
