Thermostat problem ?

[Barneydog]

Im new to diesal driving my rover 75 cdt is taking about 5 miles to warm up properly is this normal once at 9oclock seems to stay there okay may drop a little going down hill ,is the renault 5 inline mod okay thanks for any help

[Daveluck]

Originally Posted by Barneydog

Im new to diesal driving my rover 75 cdt is taking about 5 miles to warm up properly is this normal once at 9oclock seems to stay there okay may drop a little going down hill ,is the renault 5 inline mod okay thanks for any help

Mate, that pretty good. ( in my opinion / experience )

Have you checked the temp via the IPK?

[Barneydog]

Sorry dont know what the ipk is.only had the car for a few weeks and am finding quite a lot to be wrong which when reading the forum seem to be common problems clutch and slave changed been ok then lost peddle only to be told peddle was back to normal when recovery arrived. Handbrake needs compensator and cooling fan not working

[clf]

Originally Posted by Barneydog

Im new to diesal driving my rover 75 cdt is taking about 5 miles to warm up properly is this normal once at 9oclock seems to stay there okay may drop a little going down hill ,is the renault 5 inline mod okay thanks for any help

This was what mine did before fitting the inline thermostat. It also did the same AFTER fitting an inline stat. BUT it is very important to check the temperature via the On Board Diagnostics, using option 7.0. The 9 o'clock position is displayed from 75 degrees.

After fitting the inline 'stat, it still took about 5 miles to reach the 9 o'clock position. Only reaching the magical 88 degrees when pressing on, on the motorway. Whilst it was reaching the 9 o'clock position, it wasnt reaching the optimum 88. The problem was caused by a non watertight inline thermostat. I urge you to check this prior to fitting. Fill the bowl of the inline stat with cold water, and make sure no water leaks through. If it does, return it. Once I fitted a non leaking inline stat, it reached 75 within 2-3 miles, and 88, a mile or so later, all with normal driving (ie not under load)

Non watertight videos

Watertight videos

Jule's Installation How To.

[Daveluck]

Once warmed up ( about 5kms of twisty turny country roads ) mine ranges from 84° to 95° depending on driving.

I don't think I've ever had a constant 88°

[Mickyboy]

Originally Posted by Daveluck

Once warmed up ( about 5kms of twisty turny country roads ) mine ranges from 84° to 95° depending on driving.

I don't think I've ever had a constant 88°

Flipping from 84 to 95 degrees and then from 95 back to 84 might not be idea due to thermal shock just my opinion,
Mick

[Daveluck]

Originally Posted by Mickyboy

Flipping from 84 to 95 degrees and then from 95 back to 84 might not be idea due to thermal shock just my opinion,
Mick

Yep, agreed...but it doesn't do that...except on the first opening.

What tends to happen is itll hit 89/90° the stat will open and it'll step its way down to 84° then creep back up to 88/90° and start all over again. Unless I'm pulling up a hill then it' all nudge into the mid 90's.

Isn't that what its supposed to do?

I thought the stats on these cars was binary...its open its shut? If that's the case wont there will always be a temperature fluctuation while the water in the block reheats and the water in the rad cools

The only way I can see there not being fluctuation is to fit some kind of thermal mixing valve.

[Barneydog]

Thanks to everyone for all your help

[T-Cut]

Originally Posted by Daveluck

Isn't that what its supposed to do?

Yes, all wax stats behave that way, especially with diesels that don't pump much heat into the coolant. The radiator removes heat faster than the engine generates it so the temperature profile is less linear than with a petrol engine.

TC

[COLVERT]

Originally Posted by Barneydog

Im new to diesal driving my rover 75 cdt is taking about 5 miles to warm up properly is this normal once at 9oclock seems to stay there okay may drop a little going down hill ,is the renault 5 inline mod okay thanks for any help

My diesel does exactly that. I've never actually checked the running temperature on the IPK but the car gets warm quickly enough.

I've averaged 49.6 mpg over the last year which, I guess, is satisfactory.

This is with the original 13 year old thermostat.