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Inguz

Member Since: 06 Sep 2020
Location: In the wild
Posts: 96

Coolant issues

Hi all, I’m having a strange problem which is driving me nuts.

I fitted a new AMC head on my TD5. While doing it I put in a new water pump. Car starts and drives fine but the temp gauge is fluctuating.

It usually sits on the higher side. The strangest thing is it goes higher when I turn on the heater. The radiator stays cold along with the bottom pipe while the top gets hot but has no pressure.

I’ve tried bleeding it a couple of times with no success. I’ve taken out the thermostat and it works fine.

I’m a bit lost here now. Would love to hear if anyone has any ideas.

22nd Apr 2023 3:38pm

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 790

2002 Defender 110 Td5 DCPU Chawton White

Use a infrared temp meter to check the block temp after some driving. With what you describe sound more like an electrical, most likely earthing issue.

22nd Apr 2023 4:03pm

Inguz

Member Since: 06 Sep 2020
Location: In the wild
Posts: 96

I was thinking (hoping) it’s an electrical issue. I don’t want to pull the head again. Thanks for the idea, I’ll get on it.

22nd Apr 2023 5:13pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4392

Does the temp gauge always rise when you turn the heater on?

22nd Apr 2023 5:53pm

Inguz

Member Since: 06 Sep 2020
Location: In the wild
Posts: 96

Yes every time. Some times it rises then drops a little but it’s always higher than when the heater is off

22nd Apr 2023 6:08pm

barbel jim

Member Since: 12 Dec 2012
Location: Northants
Posts: 1411

Could well be an earth issue. Mine was related to the earth post, in the seat box y the drivers seat .I ran a new cable from said earth post to chassis, cured my dancing temperature. Just use a jump lead to a good earth point, and check the earths. It’s pretty quick and simple.

22nd Apr 2023 6:20pm

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