Overheating gearbox

tyregeezer · Monday at 07:59

Hi all another quick question, if you were looking at a discovery sport good condition but gearbox overheats and goes into limp, oil, filter, cooler and a flush first step? checking quality and quantity of old?
Worst case scenario second hand box
Anything else I should check first?
Thanks in advance

Stanleysteamer · Monday at 10:39

tyregeezer said:
Hi all another quick question, if you were looking at a discovery sport good condition but gearbox overheats and goes into limp, oil, filter, cooler and a flush first step? checking quality and quantity of old?
Worst case scenario second hand box
Anything else I should check first?
Thanks in advance

It may all be down to a faulty temp sender unit.
The rest is good servicing practice.

tyregeezer · Monday at 13:22

Yes thanks mate has done 130k I'm betting without a service do you know is temp sender external?

Stanleysteamer · Monday at 18:10

tyregeezer said:
Yes thanks mate has done 130k I'm betting without a service do you know is temp sender external?

I don't know the disco sport, but a search for the part ought to tell you, or simply a Google search along the lines of "changing the gearbox oil temp sender on a discovery Sport".
I cannot imagine that you'd have to take the gearbox apart to find it, if for no other reason than that it would have to have wires going to it!
On the D2 TD5 auto it is in the oil cooler. So not really near the gearbox.
Ask @gstuart I expect he'll know (and come here and tell you now I have pinged him.)

tyregeezer · Monday at 18:33

Yes mate Google says it's in the oil cooler says you need to remove radiator some say you don't will find out I suppose haven't done deal as yet still mulling but is cheap so hard to resist

Stanleysteamer · Monday at 18:37

tyregeezer said:
Yes mate Google says it's in the oil cooler says you need to remove radiator some say you don't will find out I suppose haven't done deal as yet still mulling but is cheap so hard to resist

Changing the one on my TD5 was a right sod, but then I chose not to empty the sump first. Putting the new one in at arm's length through the little access port under the wheel arch, it got very slippy!!
No ramp, obvs!

tyregeezer · Monday at 18:43

No ramp here either but not an issue as it only leaks when my face is underneath

biketeacherdave · Monday at 19:20

You need to know what gearbox it has I think its the zf6hp so the temp sensor is on the metatronics unit inside the gear box so it's oil drain, sump pan off let's be honest there overdue service items then a simple swop of the temp sensor you don't even need to drop the metatronics......at least that's shat I think but I could be wrong.
I didcwatch a you tube vid about thecexact same subject sport/d3

Stanleysteamer · Monday at 19:57

biketeacherdave said:
You need to know what gearbox it has I think its the zf6hp so the temp sensor is on the metatronics unit inside the gear box so it's oil drain, sump pan off let's be honest there overdue service items then a simple swop of the temp sensor you don't even need to drop the metatronics......at least that's shat I think but I could be wrong.
I didcwatch a you tube vid about thecexact same subject sport/d3

Stanleysteamer said:
cannot imagine that you'd have to take the gearbox apart to find it, if for no other reason than that it would have to have wires going to it!

Just goes to show how wrong you can be!
Unlikely though....

Well maybe not.....

discool · Monday at 20:10

A Discovery Sport automatic gearbox overheating, so it looks like your focusing on an iffy temp sensor, is that a guess or a certainty? as it also could include leaks in the lines or a malfunctioning cooling fan; all of which prevent the transmission from adequately dissipating heat.
So do a proper diagnosis or get a professional inspection to do it.

Below is a copy taken from the WWW.

Potential Causes:

Low Transmission Fluid: This is the most common cause of overheating as the fluid acts as a lubricant and coolant for the transmission components.
Contaminated Transmission Fluid: Old or dirty transmission fluid can lose its cooling properties.
Faulty Transmission Cooler: The transmission cooler, which is usually integrated with the engine radiator, may not be functioning properly, leading to inadequate cooling.
Clogged Transmission Filter: A clogged transmission filter can restrict fluid flow and cause overheating.
Excessive Towing or Heavy Loads: Towing or hauling heavy loads puts extra stress on the transmission, generating more heat.
Driving in Extreme Heat: High ambient temperatures can exacerbate transmission heat issues.
Internal Transmission Damage: In some cases, internal transmission components like worn clutches or seals can contribute to overheating.

Symptoms of an Overheating Transmission:

Delayed Gear Shifts: The transmission may hesitate or slip when shifting gears.
Harsh Gear Shifts: Abrupt and jarring gear changes.
Burning Smell: A burning odor coming from the transmission area
Transmission Warning Light: The dashboard may illuminate a transmission warning light
Reduced Power: Loss of engine power during acceleration

What to Do:

Check Transmission Fluid Level: Ensure the transmission fluid is at the proper level and check its condition.
Have Transmission Fluid Changed: If the fluid is old or contaminated, get it changed with fresh fluid.
Inspect Transmission Cooler: Check for any leaks or damage to the transmission cooler.
Check for Transmission Filter Issues: Have a mechanic inspect the transmission filter for any blockages.
Professional Inspection: If you suspect a serious transmission issue, take your vehicle to a qualified mechanic for a thorough diagnosis and repair.

Stanleysteamer · Monday at 20:17

discool said:
A Discovery Sport automatic gearbox overheating, so it looks like your focusing on an iffy temp sensor, is that a guess or a certainty?

No it isn't look at Tyregeezers opening post.

discool said:
So do a proper diagnosis or get a professional inspection to do it.

Fair enough.

discool said:
Professional Inspection: If you suspect a serious transmission issue, take your vehicle to a qualified mechanic for a thorough diagnosis and repair.

So why the feck post a massive list of stuff that he could or couldn't do which ends up simply saying what you said in quote 2.

Seriously mate.....

tyregeezer · Monday at 20:39

Will go through it haven't even put diagnostic on it yet, your right was just surmising really but can always hope for a easy fix surely must happen one day, sorry didn't mean to upset anyone

Stanleysteamer · Monday at 20:57

tyregeezer said:
Will go through it haven't even put diagnostic on it yet, your right was just surmising really but can always hope for a easy fix surely must happen one day, sorry didn't mean to upset anyone

You ain't upset no one!
Am looking forward to finding out exactly how it all works.
We can all learn, all the time!

tyregeezer · Monday at 21:06

Will go as normal I expect lots of head scratching, tea, input from @gstuart if there's nothing obvious stage 2
More tea and loud credence then call my mate at LR for guidance Lol usually get my head round it in the end well so far

biketeacherdave · Monday at 23:09

biketeacherdave said:
You need to know what gearbox it has I think its the zf6hp so the temp sensor is on the metatronics unit inside the gear box so it's oil drain, sump pan off let's be honest there overdue service items then a simple swop of the temp sensor you don't even need to drop the metatronics......at least that's shat I think but I could be wrong.
I didcwatch a you tube vid about thecexact same subject sport/d3

Forget that the discovery sport is a completly different gearbox all together. Sensor may still be in the gearbox tho

gstuart · Tuesday at 02:37

tyregeezer said:
Yes mate Google says it's in the oil cooler says you need to remove radiator some say you don't will find out I suppose haven't done deal as yet still mulling but is cheap so hard to resist

Hi mate

Also found this , shows pinpoint tests and faults , then goes into detail ref the gearbox

https://www.discoverysport.net/attachments/diagnosis-9-speed-automatic-awd-pdf.7482/

Hope it helps

gstuart · Tuesday at 02:41

tyregeezer said:
Yes mate Google says it's in the oil cooler says you need to remove radiator some say you don't will find out I suppose haven't done deal as yet still mulling but is cheap so hard to resist

Oops sorry mate as missed this as also came up with that location

See it has the ZF 9HP48 9-Speed, bet u can’t even tell it changing gear if it’s anything like the 6 and 8 speeds

Also as mentioned maybe the atf oil hasn’t been done

See the Automatic transmission fluid temperature sensor resistance - specification is 1 kΩ at 25°C.

Hope u get on ok

gstuart · Tuesday at 03:15

The main casing retains the ATF (automatic transmission fluid) at the bottom. A drain plug is located in the main casing.

The oil level is checked by removal of a level plug, with the engine running and the transmission fluid at a temperature of between

37 to 45°C (99 to 113°F). The level is correct when the oil flow becomes a drip from the level plug hole.

The transmission has a fluid cooler which is located at the front of the transmission, adjacent to the fluid pan. The cooler is
connected to the transmission casing by two sealed connections. The fluid cooler is connected into the engine cooling system and cools the transmission fluid by heat transfer through the cooler to the engine coolant.

For additional information, refer to: Transmission Cooling (307-02 Transmission/Transaxle Cooling, Description and
Operation).

gstuart · Tuesday at 03:25

biketeacherdave said:
Forget that the discovery sport is a completly different gearbox all together. Sensor may still be in the gearbox tho

Spot on mate as indeed it looks like it’s located inside

The fluid temperature sensor is integrated into the internal wiring harness within the transmission sensor unit. It detects the

Number 4 ATF TCM

temperature in the transmission and transmits a signal corresponding to the temperature to the . The monitors
the temperature and adjusts clutch and brake application to provide smooth gear shifts across a wide range of temperatures
and viscosities.

gstuart · Tuesday at 03:35

Fingers crossed ur be allowed to plug ur scanner in before buying it

Plus see the module is on top of the gearbox

The TCM CAN

is located on the top of the automatic transmission casing and is connected on the high speed systems bus to send and receive information to and from other system modules.

Overheating gearbox

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

Well-Known Member

D3 Grandad

D3 Grandad

D3 Grandad

D3 Grandad

D3 Grandad

Similar threads