Jump to content

Overheating Turbo Diesel (not Tdi)

Mark Jenkins

Recommended Posts

I have an overheating problem with my 1989 engine. It runs OK at town speeds but on longer hauls at speed it pushes into "Hot" and then if speed is maintained starts to nudge the red zone, forcing me to slow down. At 50, although the temperature holds "Hot" not "Red", it won't cool down properly until it is completely idle or switched off.

It's not leaking.

It has a new thermostat, a new temp sender and a new water pump.

The fan works well.

It hasn't blown a gasket and the engine has plenty of power.

This seems to leave the radiator, which has clear vanes and has been flushed and back-flushed out of the vehicle with a hose and is running clear water through it.

Does this still point to a blocked radiator core? I am prepared to replace it if necessary.

Are there any chemical remedies like radiator or engine flush you think might be worth a try?


Link to comment
Share on other sites

Hi Mark , blocked rad like what white 90 said . Have you felt rad tubes when gauge says hot? if its blocked you'll find cooler patchs indicating blocked sections. worth checking the viscous fan coupling altho this time of year its not hot enough to make any difference tbh.


Steveb ;)

Link to comment
Share on other sites

My Tdi used to behave the same. The rad was flushed, the fins were clear, no problem there. The 'stat was checked and was fine. When I eventually removed the radiator and looked carefully at it, the fins were all fine on the outside but peering in between them there were no fins at all left on the inside. I suggest you remove the radiator and inspect it under a good light so you can see "inside" the fins.


Link to comment
Share on other sites

I'd suggest checking that the notorious LR temp gauge isn't letting you down. After a similar series of panic purchases to keep the Tdi cool, I bought a Racetech gauge (marked out in degrees C instead of 'cold, ok, worry') and that 'solved' the problem.

I had a multimeter and thermocouple (£16 from Maplins) gaffataped to the wing where I could see it, worked fine for ad-hoc measurements and good to 70mph -_- .

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy