I-bus coolant temperature gauge

[Gman2]

Originally Posted by magranville

Being a fellow 1.8 owner (turbo) and an avid temperature monitor, my temperature ranges are as follows:

Driving around town = 95 - 102
Motor way = 92 - 96
Stationary = up to 103/4 before fan kicked in

My temperature has never been higher than 103/4 to date (touch wood etc etc). Does this seem about right?

Marcus

I think think this is about right for the 1.8T. The 1.8 may be generally a tad lower?

[Jules]

Originally Posted by slimsi

I have now had my temp gauge a few weeks and I have some interesting findings, basically when I am on the motorway with the AC on or off the temp is always between 80-90c.

What interests me though is that when in stop start traffic like the queue for the blackwall tunnel with the AC on it will rise to 90 but no further, with the AC off it will raise to 104ish and then drop back into the 90's.

My presumption is that with the AC on the fan runs constantly and keeps the temp down? Anyone else see this?

Simon

80-85 Deg is too low IMO Simon indicating the thermostat not doing it's job fully.
With Aircon On or OFF the thermostat or PRT should compensate until it is fully open. A further temp rise should see the fan kick in at approx the figures below:

OPERATION

K1.8

Engine Running
If the ECT sensor registers a temperatures of;

Between: 98 °C and 104 °C, = Low fan speed
Between 105 °C and 112 °C, = High fan speed

The ECM switches both cooling fan relays off if the ECT sensor registers a temperature of 98 °C or lower.

Engine Stopped:

Above 112 °C = High speed relay

The cooling fan motor is now able to operate at high speed until the ECT sensor registers a temperature of below 112 °C.


KV6


If the ECT sensor registers engine coolant temperatures of:

Between 96°C and 100°C, = Low fan speed
Between 102°C and 106°C, = Medium fan speed
Between 108°C and 112°C, = High fan speed

Air Conditioning Request
If air conditioning is requested, the cooling fans will automatically operate at medium speed, even if the engine coolant temperature is below 96 °C. If an air conditioning request is received by the ECM when the cooling fan is running at low speed (i.e. the engine coolant temperature is between 96 °C and 100 °C) the ECM will increase the fan speed to medium. If the engine coolant temperature rises above 108 °C the cooling fans operate at high speed as described previously.


M47R Diesel

If the ECT sensor registers an engine coolant temperatures of:

Between 100°C and 105°C, =Low fan speed
Between 106°C and 111°C, = Medium fan speed.
Between 112°C and 119°C, = High speed.

For 2 speed motors IIRC the ECU energises SLOW speed for a larger temp span.
For example in the diesel engine:

From 100 Deg C to 111 Deg C = Slow Speed
From 112 Deg C to 119 Deg C = High Speed

Taken from RCL 0311ENG
Please bear in mind if you are relying in the On board diagnostics for readouts, this assumes your Temp sensors, Thermostats etc are still in Spec, all these devices change value/tolerance with age

[hans.schaaper]

I noticed today that if you start the engine while the coolant temperature is below zero (Celsius), the temp. gauge sounds the alarm.
This is NOT an added feature but a flaw in my software.
I (over)simply assumed that the IPK lowest temp. transmitted would be 0 C.
This morning it displayed -3 C and set off the alarm.
This is annoying but won't last very long as the coolant warms up quickly.
Perhaps it's an extra bonus that warns you not to drive off while the alarm sounds.

[vincent48]

Originally Posted by hans.schaaper

I noticed today that if you start the engine while the coolant temperature is below zero (Celsius), the temp. gauge sounds the alarm.
This is NOT an added feature but a flaw in my software.
I (over)simply assumed that the IPK lowest temp. transmitted would be 0 C.
This morning it displayed -3 C and set off the alarm.
This is annoying but won't last very long as the coolant warms up quickly.
Perhaps it's an extra bonus that warns you not to drive off while the alarm sounds.

A small price to pay for a magnificent piece of kit

[T-Cut]

It will also act as reassurance that your OAT is doing it's job. You do have OAT in?? If not, that alarm means get some quick!

TC

[Parker]

My computer got confused a while back and gauge dropped to -99 degrees and alarm sounded. i did post this. After battery reset all fine. It's a great piece of kit and I think the -0 degree alarm is an added bonus for free. As you say keeps your mind focused on possible ice conditions, can only be a good thing.

[capese21]

A small price to pay for a magnificent piece of kit

Many Thanks your kit is fantastic.

Ed

[Jules]

Originally Posted by Parker

My computer got confused a while back and gauge dropped to -99 degrees and alarm sounded. i did post this. After battery reset all fine. It's a great piece of kit and I think the -0 degree alarm is an added bonus for free. As you say keeps your mind focused on possible ice conditions, can only be a good thing.

Yes probably boost his sales this Alarm "feature" especially for owners no message center IPK

[T-Cut]

For the coolant sensor to indicate zero Centigrade, the ambient is indeed very cold. In the UK, I suspect an engine would need to be unused for several days in a persistant sub-zero ambient to actually get that low. Even so, every little helps as somebody keeps saying.

TC

[Parker]

Went out this morning after car being parked overnight and got the warning beeps, gauge registered engine temp as -3 degrees, the outside temp was showing -6. I think a great accidental feature.