In Line Thermostat mod not working - Page 2

munroman · 5th December 2012, 22:33

I have the THO1489 and the temperature hasn't exceeded 84c since I fitted it, even in warm weather and traffic jams.
It does, however, warm up much quicker than it did per in line mod....

hbcmike · 13th December 2012, 12:44

Update to this - I had fitted the Gates Th01483, following earlier post, which didn't help. On removal, the centre brass section was loose on the thermostat which also didn't help! Rockauto completely disinterested in a warranty replacement, so won't use them again.

Have replaced with a Halfords sourced thermostat, 89C, and much better. Have seen 86C on the display, so not far off.

Halfords stat was a QTH144, £8.99 (or £4.59 with trade card). When inserting in the hose, only pushed it in far enough to be able to fully refit the hose to the engine, seems ok.

James.uk · 13th December 2012, 15:48

I recently fitted this mod, and at the park today ran the engine whilst parked watching the OBD temp. The temp was at 84C when I got there, within seconds of parking it dropped to 79 and stayed at that, the outside fan didn't kick in. The car did get warmer when driven, up to 84c ish..

The heater cools the car very quickly though, but then the outside temp was only 33f so about 0c innit...

I'm not complaining though, it was nice sat there wrapped in my nice tartan car rug. Actually, I have a small hairy rug that I got from the pet shop, I wrap that round my legs, then wrap the rug over the top. It's great sat there dunking ginger bikkies and drinking a nice hot coffee, lil dog hanging out of the passengers window, watching the birds skidding about on the frozen lake innit..

Lots of people about walking their dogs, or just walking round the lake for exercise..

very friendly lot too, most stop to pat the dog and say hello..

It's interesting that people do that up here, down South you could sit there for a month and no one would speak to you..

...

jonathan63 · 13th December 2012, 18:22

I ordered a new TH01489 form my local EK Brakes. Im told that its 88c rated and equivelant to QTH268.

I will be fitting it at the weekend in the hope that it will keep me warm on a 600 mile round trip to a funeral on thursday.

I hope it works.

squall89 · 13th October 2020, 03:18

hello. I resume this thread to ask: more or less how much time does this inlet mode need?

the original thermostat worked well. then I changed the water pump. And now it seems that the thermostat is stucked open.

see this video

https://youtu.be/Bo_aOkqwPqc

thank you

T-Cut · 13th October 2020, 12:04

Quote:

Originally Posted by squall89

hello. I resume this thread to ask: more or less how much time does this inlet mode need?

Hello Paolo, it's a pretty easy task. Here's how to fit the Renault 5 in-line thermostat in 'less than 30 minutes': https://www.the75andztclub.co.uk/for...ad.php?t=74451

In addition to this, the stat's manufaturer is also imporant. Some R5 stats don't work so well. The ones giving good results are branded Gates, Wahler and FirstLine.

TC

vilas66 · 13th October 2020, 12:52

Hello Paolo, I live in Italy I live in Rome and I have 3 75's at the moment (one is a donor ar) all CDTi ones. As I replied You in other posts the inline is a good compromise but not exaclty the same. Here's my experience: with the original thermostat my car reaches up to 89° and, whatever the outside temp when warm, the temperature interval is between 84 to 89. With the inline thermostat I never go over 84°c but, most interesting fact, while running (depending on conditions from the long descents on motorway up to Rome heavy traffic) temperature ranges from 71° to 84° and that's, AFAIK, due to the position where the inlet thermostat is fit. I've used a Gates one. Can't remember if an 82 or 89 one but, whatever thermostat You buy, will never give You the same temperature stability provided by the original designed one. This is obviously based on my experience of 75's ownership since 2006

DMGRS · 13th October 2020, 13:29

I always found the thermostat mod to be quite stable - they send to sit between 80 and 85 degrees and doesn't fluctuate much.

YHT · 13th October 2020, 18:13

I fitted an in line thermostat to my latest "project" as the existing in line one was erratic seemingly not opening at times or opening and closing quickly. Drilled a small hole to help release trapped air at the top hose. Also had to replace the water pump but removed the thermostat from next to the pump and its mounting lugs making fitting the housing much easier. Temp. stays at 9 o'clock once warmed up which is in about 4 miles.

Mike Trident · 13th October 2020, 18:36

Once fully warmed up, mine sits at about 83 to 84, maybe creeping up to 86 on a long motorway hill. Its pretty stable.

However, if its really cold outside and you allow it to tick over for some time, it will slowly start dropping into the 70's. But as we know, this is why its fitted with a FBH.

Inline stat for heading on 4 years, works a treat.

13th October 2020, 12:52	#17
vilas66 Avid contributor Rover 75 CDTi Tourer, CDTi Tourer, Saloon Join Date: Sep 2007 Location: ROME Posts: 216 Thanks: 60 Thanked 32 Times in 22 Posts	Hello Paolo, I live in Italy I live in Rome and I have 3 75's at the moment (one is a donor ar) all CDTi ones. As I replied You in other posts the inline is a good compromise but not exaclty the same. Here's my experience: with the original thermostat my car reaches up to 89° and, whatever the outside temp when warm, the temperature interval is between 84 to 89. With the inline thermostat I never go over 84°c but, most interesting fact, while running (depending on conditions from the long descents on motorway up to Rome heavy traffic) temperature ranges from 71° to 84° and that's, AFAIK, due to the position where the inlet thermostat is fit. I've used a Gates one. Can't remember if an 82 or 89 one but, whatever thermostat You buy, will never give You the same temperature stability provided by the original designed one. This is obviously based on my experience of 75's ownership since 2006 __________________ Rover 75 Connoisseur Tourer (Two), Contemporary SE Saloon and (** most of all ) Wolseley 6/99 and SD1 2000 owner Regular Member**

13th October 2020, 13:29	#18
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	I always found the thermostat mod to be quite stable - they send to sit between 80 and 85 degrees and doesn't fluctuate much. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

13th October 2020, 18:36	#20
Mike Trident Posted a thing or two Rover 75 CDTi Saloon & Citroen C1 Join Date: Jun 2016 Location: Oakenshaw, Near Bradford Posts: 1,622 Thanks: 385 Thanked 552 Times in 328 Posts	Once fully warmed up, mine sits at about 83 to 84, maybe creeping up to 86 on a long motorway hill. Its pretty stable. However, if its really cold outside and you allow it to tick over for some time, it will slowly start dropping into the 70's. But as we know, this is why its fitted with a FBH. Inline stat for heading on 4 years, works a treat. __________________ Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual) 160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control. BORN Tuesday, 5th October 2004 @ 12:35:52 This vehicle was the 104,679th 75 to run off the production line, out of 112,381 This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744 This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s

5th December 2012, 22:33	#11
munroman Loves to post Rover 75 Tourer Join Date: Mar 2012 Location: Glasgow Posts: 409 Thanks: 365 Thanked 83 Times in 62 Posts	I have the THO1489 and the temperature hasn't exceeded 84c since I fitted it, even in warm weather and traffic jams. It does, however, warm up much quicker than it did per in line mod....

13th December 2012, 12:44	#12
hbcmike Regular poster 75 Saloon CDTI Join Date: Feb 2012 Location: Brighton Posts: 37 Thanks: 0 Thanked 0 Times in 0 Posts	Update to this - I had fitted the Gates Th01483, following earlier post, which didn't help. On removal, the centre brass section was loose on the thermostat which also didn't help! Rockauto completely disinterested in a warranty replacement, so won't use them again. Have replaced with a Halfords sourced thermostat, 89C, and much better. Have seen 86C on the display, so not far off. Halfords stat was a QTH144, £8.99 (or £4.59 with trade card). When inserting in the hose, only pushed it in far enough to be able to fully refit the hose to the engine, seems ok.

13th December 2012, 15:48	#13
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	I recently fitted this mod, and at the park today ran the engine whilst parked watching the OBD temp. The temp was at 84C when I got there, within seconds of parking it dropped to 79 and stayed at that, the outside fan didn't kick in. The car did get warmer when driven, up to 84c ish.. The heater cools the car very quickly though, but then the outside temp was only 33f so about 0c innit... I'm not complaining though, it was nice sat there wrapped in my nice tartan car rug. Actually, I have a small hairy rug that I got from the pet shop, I wrap that round my legs, then wrap the rug over the top. It's great sat there dunking ginger bikkies and drinking a nice hot coffee, lil dog hanging out of the passengers window, watching the birds skidding about on the frozen lake innit.. Lots of people about walking their dogs, or just walking round the lake for exercise.. very friendly lot too, most stop to pat the dog and say hello.. It's interesting that people do that up here, down South you could sit there for a month and no one would speak to you.. ...

13th December 2012, 18:22	#14
jonathan63 This is my second home CDTi Conniosseur SE HLNav Tourer and a Personal Line CDT Conniosseur SE Tourer..for the time being. Join Date: Jul 2010 Location: Cumbria Posts: 3,639 Thanks: 340 Thanked 423 Times in 294 Posts	I ordered a new TH01489 form my local EK Brakes. Im told that its 88c rated and equivelant to QTH268. I will be fitting it at the weekend in the hope that it will keep me warm on a 600 mile round trip to a funeral on thursday. I hope it works.

13th October 2020, 03:18	#15
squall89 Regular poster ROVER 75 Join Date: Feb 2018 Location: ROME Posts: 63 Thanks: 4 Thanked 2 Times in 1 Post	hello. I resume this thread to ask: more or less how much time does this inlet mode need? the original thermostat worked well. then I changed the water pump. And now it seems that the thermostat is stucked open. see this video https://youtu.be/Bo_aOkqwPqc thank you

13th October 2020, 18:13	#19
YHT Loves to post Rover 75 Saloon Join Date: Jun 2017 Location: suffolk Posts: 264 Thanks: 46 Thanked 25 Times in 23 Posts	I fitted an in line thermostat to my latest "project" as the existing in line one was erratic seemingly not opening at times or opening and closing quickly. Drilled a small hole to help release trapped air at the top hose. Also had to replace the water pump but removed the thermostat from next to the pump and its mounting lugs making fitting the housing much easier. Temp. stays at 9 o'clock once warmed up which is in about 4 miles.