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lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3551

TDCi heater controls

The heater in my 2014 Defender is superb, however is there a way to improve the control of heat?

lt's either Dante's Inferno or Frozen Fractal with nothing in between.

l've looked it up and there was a long thread about it years ago which centred around a better heater valve, but the links to said valve no longer work.

The only way l can control it at the moment is to turn the blower on and off as required. Also if you turn the temperature to full cold it doesn't go cold unless you turn the A/C on for a short while and then it becomes cold.

Maybe there's an adjustment needed somewhere to improve the transition to cold from hot?

25th Oct 2025 8:43pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2555

Im afraid it’s either hot or cold, with nothing in the middle.
Re not getting fully cold , if you look at the valve you will likely see it’s not fully closing. To rectify this you can fit a spring on the valve.
There is a topic on here with pics to show the spring conversion. https://www.defender2.net/forum/topic78660...lve+spring

Edit- added link to spring mod topic

Last edited by Ianh on 26th Oct 2025 10:03am. Edited 1 time in total

25th Oct 2025 9:23pm

Clemmo

Member Since: 03 Aug 2012
Location: Mile Oak
Posts: 1334

Yes…it’s hot or cold… no fine tuning.
I have found the Mud Heat Deflector can make you feel “less hot” as it diverts the air blast forward into the footwell rather than onto your leg..but no adjustment.

At least with Puma you do get hot…and the Air Con is very good too

( as long as your air con condenser is not in pieces as they often are)
Clemmo

25th Oct 2025 10:33pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3551

Yes l've got the MUD deflector (fitted by the previous owner) and working A/C
The condenser looks good, it's not lost any vanes.

l can't complain about the heat output of the system, it's like a furnace

26th Oct 2025 10:33am

jbcollier

Member Since: 29 Apr 2024
Location: Edmonton AB
Posts: 286

2009 Defender 110 Puma 2.4 SW Alpine White

The range of valve travel and the amount of cable pull do not match. You have to adjust the cable to fully closed in the summer and to fully open in the winter.

The design of heater valve is supposed to be paired with a heater box that blends heated and cooled air to increase the efficiency of the AC system. It doesn't regulate hot coolant flow in relation to cable travel. Bit of pain, true, but actually having HEAT is such a plus, I don't mind at all.

You can't fit a volume control type of heater valve as the flow through the heater hoses is important in the rather complicated cooling system.

26th Oct 2025 11:53am

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