Freelander thermostat replacement

**Westrock200** · 5th Jan 2008, 14:10

Dear All,

I am a newbie, so hello and happy new year.

Would anyone have any step by step info on the replacement procedure of the Freelander 1.8 thermotstat?

Thanks

Westrock 200

**TEMPL4R** · 5th Jan 2008, 14:25

You mean the one at the back of the engine, not the mod?

It is actually easier if you take the inlet manifold off.

But, you remove the 2 bolts holding the big black pipe to the back of the block, it goes around the end of the engine. Pull it back towards the flywheel end. Take the 3 bolts out of the housing. Fit the stat seal, then the stat ( it will need to line up with the flats on the housing), the stat top housing. Lube the o ring and push the black pipe on, re fit the 2 bolts. These must be fitted or the pipe will fall back and lose the water.

(Check the end of the pipe where it fits the stat housing, they get pinholes near the waisting and leak.)

Fill the system, undo the bleed screw on that big black metal pipe, round the bend, when the air is purged, do the same with the one on the heater pipe. Keep the header tank topped up. When air is purged from the heater pipe, then start the engine and run until all pipes and heater are nice and hot,( heater turned to hot)

Chris

**Westrock200** · 7th Jan 2008, 10:12

Dear Chris,

Thank you.

Yes, pre the modification.

Most helpful and exactly what I was looking for.

Kind regards

Westrock200

**thermodix** · 26th Feb 2009, 14:23

Originally Posted by Westrock200

Dear All,

I am a newbie, so hello and happy new year.

Would anyone have any step by step info on the replacement procedure of the Freelander 1.8 thermotstat?

Thanks

Westrock 200

I think look at this guys... http://www.landyzone.co.uk/lz/attach...at-mod-prt.jpg
hope this will give you some idea....

_________________
Thermostat

**TEMPL4R** · 26th Feb 2009, 19:30

That's the mod.

Chris

**Tripyrenees** · 16th Mar 2009, 11:18

Hi
I have tried to follow the descriptions below but still cannot locate the Thermostat on my 1.8 freelander (1998). My fans are not functioning and my temp guage is reading the same all the time. I am assuming it is the Thermostat and need to get it fixed at the MOT man cannot conduct the pollution tests as the car over heats within seconds of revving it up.

Are there any photos or pictures pointing to the Thermostat (probably un modified version)

Cheers
Ian

**TEMPL4R** · 16th Mar 2009, 19:34

Look at the rear of the cylinder head, where the gearbox joins the engine.

There is a hose from the radiator and a black metal pipe. Follow that round the back of the engine, under the intake manifold. Where it joins the engine is the back of the water pump, it's there.

If you look down where the hose comes from that metal pipe to the radiator and you can see a white plastic thing with 3 hoses on it, that is the mod, then that is the thermostat.

Chris

**Tripyrenees** · 17th Mar 2009, 07:04

Cheers Chris - I found it and I have removed the Thermostat but how can you tell that iti si faulty? I assume I have to try a new one first OR is it better to do the MOD at this stage.

What started me on this was the fact that the coolant was being forced out of the header/expansion tank. This was while the freelander was on the rolling road at the MOT centre. The radiator fans did not cut in and the temp guage read normal.

The head gasket was changed out quite a few years ago now (had the car about 8 years, a never ending list of problems). Do these symptoms point to the thermostat or could it be something else.

Thanks for all your help
Ian

**MrRob** · 17th Mar 2009, 08:12

I had this problem of coolent being forced out of the expension tank cap and it was due to an old and tired cap. Replaced the cap and bobs your uncle.

**TEMPL4R** · 17th Mar 2009, 08:16

While you have it out, I'd do the mod. Remember not to put a stat back in there, I tend to knock the centre out and fit the seal and outer part. It helps restrict the flow a bit so it draws water through the heater system and seals the housing.

The mod allows water to flow all round the engine and back down that black pipe, that ensures a better, more even warm up of the head and block. When it gets hot enough, the stat closes one pipe and sends the water through the rad.

Chris

**Tripyrenees** · 16th Apr 2009, 18:07

It has been a while but I have now installed the modified thermostat and also a new expansion tank cap. The engine heats up quickly but the expansion tank holds now.
But the problem is that the Temp Gauge does not function and the cooling fans do not kick in at all. I have checked the fuse, I would check the relay if I could find it. What else could it be.

Thanks in advance
Ian

**swancjack** · 23rd Jul 2009, 21:29

hi new to site can anybody tell me how to dismantel the thermostat on my freelander thanks andrew

**freelanderauto** · 30th Dec 2009, 18:22

hi mate, yeah at the back of the engine block on the left side there is a black plastic housing, its behind the water pump... you need to take the bolts out of that and the bolts that hold the pipe secure along the back of the head ( once you have a look its quite easy ) if i were you, take the thermostat out, put the seal back in and put it all back together then go to land rover or a land rover parts specialist and get the thermostat mod kit, this replaces the pipes that are seen going in and out of the radiator and at the front right side of the engine.... basically, take the pipes that are already there off and replace with the new pipes which include a new thermostat, (ints inside the creamy/ grey housing that the new pipes come attached to). it isnt hard at all as you dont have to assemble anything, just take your old pipework off and fit the new pipwork which includes the new thermostat. the idea of having the thermostat here is because as standars the k series engine had the thermostat on the inlet side whick was great for the smaller engined city cars as it warms up quicker for shorter journeys but the draw back is that its regulating the water that has already been through the radiator and cooled, not once its been through the engine and its hot. this make the engine run much hotter. the new thermostat is positioned on the outlet of the engine and regulated the engine temperature in a much, much better way. it is also pressure regulated uncase it failed, the hot water pressure makes it open so it can flow through the ratiator and cool, not letting your engine boil up.
hope this helps and once you look at the thermostat mod kit you understand how it all fits together.