Jump to content

Over cooled? heater issues?

Recommended Posts

I know this comes up a load; 

I have a defender 90 1991 200tdi when I bought it, it always ran a little hot, it always stayed scarily close to but below the red section on the temperature gauge but never went into it. From memory when it was like this the heater worked but with the usual feebleness that you expect from a neglected old landy. 

Anyway I had a galv chassis put on and told the fellas that did it that it always ran a little hot; when I got the landy back this was completely solved; don't know how but the temperature gauge never gets over 1/3 of the way through the white area, I often do little short trips so figured I wasn't going far enough but i've done 150+ miles today with no issues and again despite 150 plus miles at 70mph the temps only reading 1/3rd the way through the white area on the gauge. 

I have been speaking to my mate and he said the two things might be linked, if I were to have an air lock in the system this might prevent coolant either A, reaching the point where the temperature sensor is and B flowing into the heater matrix - explaining the lack of hot air. 

What do our resident experts think? What should I try? what should I test? If I want to flush and refill the system what do I need and how to I go about it to ensure no air locks? 


Help appreciated as I'm all at sea. Just niggling me!


Link to comment
Share on other sites

Hmmm, I'd be whipping off the thermostat and a) checking there's one there and b) checking it's operation.

The reason for point a is that I snapped a crank and ended up swapping an engine as a quick fix solution. The substitute engine wasn't getting off cold so got around to whipping out the old thermostat (which I knew worked) and went to swap it in. Was a little surprised when I couldn't find a thermostat in the swapped engine.

So perhaps the "fix" was to remove the thermostat so now it's always being cooled by the radiator :ph34r:

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