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Ad-doublecab

Member Since: 05 Jan 2021
Location: London
Posts: 64

1995 Defender 110 300 Tdi DCPU Loire Blue

Rad cold after coolant flush

Hi guys,

So I recently fitted a new rad and thermostat and heater matrix on my 2.4 tdci filled up with coolant bleed the air out and the next day the coolant had dropped slight so topped it back up to the level

Took it for a drive around 8 miles but the rad isn’t getting hot getting hot air from heater but the rad still cold?

Am I not driving long enough for it to get hot or does it sound like a air lock? (Was around 30-40 min drive)

Cheers

23rd Mar 2023 6:26pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3410

2012 Defender 90 Puma 2.2 CSW Santorini Black

Sounds like engine not yet reached full operating temperature, so thermostat still closed. Especially if you were using the heater to warm the cabin, with low external temperatures, and not too much load on the engine. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

23rd Mar 2023 6:57pm

Ad-doublecab

Member Since: 05 Jan 2021
Location: London
Posts: 64

Thanks for replying I’ll take it for a longer drive with heaters off!

23rd Mar 2023 7:19pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20300

You want more like a 20 mile round trip and with the heaters off, depends on ambient temperature but it can take a while to get up to temperature.
Usually a couple of miles starts warming up, about 4 miles should be up to temperature but to fully heat up to maximum more than that.

Did you follow the bleed process of the workshop manual? ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️

23rd Mar 2023 7:40pm

Ad-doublecab

Member Since: 05 Jan 2021
Location: London
Posts: 64

Thanks Steve, I’ll take it for a longer drive only thing I didn’t do was disconnect the oil thermostat coolant hose 😬

23rd Mar 2023 8:13pm

Ad-doublecab

Member Since: 05 Jan 2021
Location: London
Posts: 64

Ad-doublecab wrote:
Thanks for replying I’ll take it for a longer drive with heaters off!

Update

So I took it for a longer drive today 50 miles in total with the heater off the car was cutting in and out of power then died temp was half way, heater on alway is very hot and but drives okay rad was cold when I got back engine running but when switched it off rad was hot on the top right hand corner 😕

Anyone has this issue before?

Cheers

28th Mar 2023 3:17pm

pdv

Member Since: 07 Feb 2014
Location: Asse
Posts: 26

2008 Defender 90 Puma 2.4 CSW Bonatti Grey

any news ? i have exactly the same problem.

thanks

19th Jun 2024 9:50am

Ad-doublecab

Member Since: 05 Jan 2021
Location: London
Posts: 64

I put a new rad, new stat and was still the same then changed the heater control valve and that fixed it check your valve before replacing anything else

19th Jun 2024 10:23am

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2412

2007 Defender 110 Puma 2.4 SW Chawton White

Did you fit one of those low temp thermostat? Puma 110" SW

.............................................................
Earth first. Other planets later

19th Jun 2024 11:55am

Ad-doublecab

Member Since: 05 Jan 2021
Location: London
Posts: 64

Started off with a normal one second one I fitted was the low temp stat

19th Jun 2024 12:08pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2412

I am switching back to the original one asap. And I´ll keep the oil cooler thermsotat off though. Puma 110" SW

.............................................................
Earth first. Other planets later

19th Jun 2024 12:13pm

pdv

Member Since: 07 Feb 2014
Location: Asse
Posts: 26

hi all

my new OEM thermostat was totally faulty ( not opening) and the old one didnt open all the way, so after 2 new thermostats everything is back to normal.

original 86° stat fitted now that solved everything.

cheers T.

26th Jun 2024 6:17pm

hornet

Member Since: 04 Jan 2010
Location: Western Europe
Posts: 361

Thank you very much for your feedback!

27th Jun 2024 7:52am

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