Fan runs after engine is turned off
#1
#3
yup fan is on after longish drives. What all do I need to check? Or is this something normal? I doubt it is normal, but not sure.
#4
+1 on KC's remarks.
Same hot weather here as you experience.
The only time mine had the same problem was when my thermostat got stuck in a closed position.
Replacing it (with some other upgrades at the same time) solved the issue immediately.
I more and more think X308 owners should do a preventive replacement of the thermostat every couple of years, they are cheap and it is not a lot of work.
Same hot weather here as you experience.
The only time mine had the same problem was when my thermostat got stuck in a closed position.
Replacing it (with some other upgrades at the same time) solved the issue immediately.
I more and more think X308 owners should do a preventive replacement of the thermostat every couple of years, they are cheap and it is not a lot of work.
#5
+1 on KC's remarks.
Same hot weather here as you experience.
The only time mine had the same problem was when my thermostat got stuck in a closed position.
Replacing it (with some other upgrades at the same time) solved the issue immediately.
I more and more think X308 owners should do a preventive replacement of the thermostat every couple of years, they are cheap and it is not a lot of work.
Same hot weather here as you experience.
The only time mine had the same problem was when my thermostat got stuck in a closed position.
Replacing it (with some other upgrades at the same time) solved the issue immediately.
I more and more think X308 owners should do a preventive replacement of the thermostat every couple of years, they are cheap and it is not a lot of work.
#6
For peace of mind, you can easily check the old thermostat in some boiling water.
Mine clearly remained stuck, while the new one opened up when needed.
Besides of the tower, it is a good idea to replace the plastic crossover pipe in front of it, it is made of the same brittle plastic as the original tower (and it will give you a new temp sensor for free )..
If the waterpump was replaced in 2013, I should not bother too much.
Handling the plastic manufacturing process has come a long way since 1998 when some problems happened.
On the x308, the OBD2 port is in the driver's foot-well, on the right side, up against the middle console.
Not every car / make has the same output (I have one Torque configuration for our X308, and an other one for our SLK), but it is reading all important data, and quite some more.
Mine clearly remained stuck, while the new one opened up when needed.
Besides of the tower, it is a good idea to replace the plastic crossover pipe in front of it, it is made of the same brittle plastic as the original tower (and it will give you a new temp sensor for free )..
If the waterpump was replaced in 2013, I should not bother too much.
Handling the plastic manufacturing process has come a long way since 1998 when some problems happened.
On the x308, the OBD2 port is in the driver's foot-well, on the right side, up against the middle console.
Not every car / make has the same output (I have one Torque configuration for our X308, and an other one for our SLK), but it is reading all important data, and quite some more.
#7
For peace of mind, you can easily check the old thermostat in some boiling water.
Mine clearly remained stuck, while the new one opened up when needed.
Besides of the tower, it is a good idea to replace the plastic crossover pipe in front of it, it is made of the same brittle plastic as the original tower (and it will give you a new temp sensor for free )..
If the waterpump was replaced in 2013, I should not bother too much.
Handling the plastic manufacturing process has come a long way since 1998 when some problems happened.
On the x308, the OBD2 port is in the driver's foot-well, on the right side, up against the middle console.
Not every car / make has the same output (I have one Torque configuration for our X308, and an other one for our SLK), but it is reading all important data, and quite some more.
Mine clearly remained stuck, while the new one opened up when needed.
Besides of the tower, it is a good idea to replace the plastic crossover pipe in front of it, it is made of the same brittle plastic as the original tower (and it will give you a new temp sensor for free )..
If the waterpump was replaced in 2013, I should not bother too much.
Handling the plastic manufacturing process has come a long way since 1998 when some problems happened.
On the x308, the OBD2 port is in the driver's foot-well, on the right side, up against the middle console.
Not every car / make has the same output (I have one Torque configuration for our X308, and an other one for our SLK), but it is reading all important data, and quite some more.
Ok cool, I will test the thermostat Monday. If it is good, what else should I check? Also, I noticed it doesn't always run the fans once shut it off after driving. But the fans were running at high speed. They turned off after 5 minutes. Thanks for the help!
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#8
Well, maybe you just don't have a problem, fans are there to cool the engine, and do so if needed after shutting down.
However, as mentioned, I live in a hot, humid (and mountainous) country myself, and the fans only came on after parking up when I experienced the thermostat issues.
If I was you, besides of the test, I should get the app working on your XJ8.
It will tell you in detail what's going on in there, so no more guessing.
Check the actual value of the coolant-temp, and see if it is low after a night parked, and rises after starting.
However, as mentioned, I live in a hot, humid (and mountainous) country myself, and the fans only came on after parking up when I experienced the thermostat issues.
If I was you, besides of the test, I should get the app working on your XJ8.
It will tell you in detail what's going on in there, so no more guessing.
Check the actual value of the coolant-temp, and see if it is low after a night parked, and rises after starting.
Last edited by ericjansen; 07-29-2017 at 07:29 PM.
#9
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#13
I've learned a lot from being on the Forum, but I still haven't got my head around the cars 'brain' and how it can be changed/manipulated. Is it not possible to program when the fans should kick-in, like, tweak some settings somewhere/somehow? Please forgive me if that's a daft question, electronics is not my strong point!
I'm sure most members will remember the recent competition to win the True Temp Gauge (think that's what it was called?), are these readily available and a worthwhile MOD?
The reason I ask is that in the UK overheating is certainly not a common problem lol! So it is worth noting if settings can be 'changed' as (being so rare in the UK) any high temp would indicate a serious issue with the car's cooling system? It's pretty rare we get more than 2 or 3 days a year where the temperature reaches the dizzy height of 30 degrees C, especially in the North East UK where I live (16 C today!). Buying summer clothes is cheap though!!
I'm sure most members will remember the recent competition to win the True Temp Gauge (think that's what it was called?), are these readily available and a worthwhile MOD?
The reason I ask is that in the UK overheating is certainly not a common problem lol! So it is worth noting if settings can be 'changed' as (being so rare in the UK) any high temp would indicate a serious issue with the car's cooling system? It's pretty rare we get more than 2 or 3 days a year where the temperature reaches the dizzy height of 30 degrees C, especially in the North East UK where I live (16 C today!). Buying summer clothes is cheap though!!
#14
Paul,
First of all, the X308 cooling system and controls work flawlessly if in up to date condition, and is able to control temperatures in the hottest of conditions, I can testify from practice in tropical conditions.
Problems are mainly caused by old hoses, improper hose clamps, failing thermostat, failing temperature sensor, failing plastics, a leaking pressure cap on the expansion tank, and mixed up coolant liquids.
Replace (some of) the above on a regular base, and you should be totally safe.
That said, the mentioned 'real gauge' is a nice mod, transforming the temperature gauge from an 'idiot light' into a real indication of the coolant temperature.
I think it also got an audible alarm if things get too hot.
First of all, the X308 cooling system and controls work flawlessly if in up to date condition, and is able to control temperatures in the hottest of conditions, I can testify from practice in tropical conditions.
Problems are mainly caused by old hoses, improper hose clamps, failing thermostat, failing temperature sensor, failing plastics, a leaking pressure cap on the expansion tank, and mixed up coolant liquids.
Replace (some of) the above on a regular base, and you should be totally safe.
That said, the mentioned 'real gauge' is a nice mod, transforming the temperature gauge from an 'idiot light' into a real indication of the coolant temperature.
I think it also got an audible alarm if things get too hot.
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euphonium01 (09-21-2017)
#15
Paul,
First of all, the X308 cooling system and controls work flawlessly if in up to date condition, and is able to control temperatures in the hottest of conditions, I can testify from practice in tropical conditions.
Problems are mainly caused by old hoses, improper hose clamps, failing thermostat, failing temperature sensor, failing plastics, a leaking pressure cap on the expansion tank, and mixed up coolant liquids.
Replace (some of) the above on a regular base, and you should be totally safe.
That said, the mentioned 'real gauge' is a nice mod, transforming the temperature gauge from an 'idiot light' into a real indication of the coolant temperature.
I think it also got an audible alarm if things get too hot.
First of all, the X308 cooling system and controls work flawlessly if in up to date condition, and is able to control temperatures in the hottest of conditions, I can testify from practice in tropical conditions.
Problems are mainly caused by old hoses, improper hose clamps, failing thermostat, failing temperature sensor, failing plastics, a leaking pressure cap on the expansion tank, and mixed up coolant liquids.
Replace (some of) the above on a regular base, and you should be totally safe.
That said, the mentioned 'real gauge' is a nice mod, transforming the temperature gauge from an 'idiot light' into a real indication of the coolant temperature.
I think it also got an audible alarm if things get too hot.
#17
#18
I had a fans running-on condition with the wife's XJR last year - Plums posted a procedure for bleeding the system, which solved the problem - apparently an air gap at the temp sender for the fans if I recall correctly. The trick for bleeding is to bring the car up to temp with the system open and then put a head of coolant via a funnel on the expansion tank. As the car cools it draws in coolant until everything equalizes. Worked like a charm and no running-on since. If you think about it the fans running with nothing circulating doesn't serve any purpose except drawing the battery down. A quick search should find the detailed procedure. Good luck.
#19
I had a fans running-on condition with the wife's XJR last year - Plums posted a procedure for bleeding the system, which solved the problem - apparently an air gap at the temp sender for the fans if I recall correctly. The trick for bleeding is to bring the car up to temp with the system open and then put a head of coolant via a funnel on the expansion tank. As the car cools it draws in coolant until everything equalizes. Worked like a charm and no running-on since. If you think about it the fans running with nothing circulating doesn't serve any purpose except drawing the battery down. A quick search should find the detailed procedure. Good luck.