Paul Haskey

Overheating Classic S Type

Recommended Posts

I took the above to my local garage to get it done. Turns out there was no thermostat in the car! The garage fitted one but from what I understand, it's not going to cure an overheating problem. 
They say the rad seems o.k but they suspect it's a water pump problem as the hose to the matrix, and the water within, is still cold. There was a new core plug fitted in Feb' 2016 and no engine blockages were picked up. I've been told that it's probably the rad- but I don't know. Are the rads easy to remove? Do I need to Jack the car up? I'm told by JEC members I can flush it out, upside down, with a hosepipe but ultimately I suppose it will need re-coring.
Thanks, Paul

Share this post


Link to post
Share on other sites
Guest

Hi Paul,

Given the nature of the engineering when your car was built I believe it would be considerably easier than with a modern - eighties on - car. Fewer electronics for one thing and probably more space under the bonnet.

Frankly getting the radiator out should be reasonably straight forward and you can indeed flush it out with a hose pipe, but I agree with your engineer thats its more likely to be the water pump. It should also be a fairly simple task to remove and replace this too. The challenge will be to find a replacement.

Cheers,

Steve 

Share this post


Link to post
Share on other sites

Had the radiator re-cored and they sandblasted the water pump; the nozzle being partially blocked, which seems to have cured the the problem.

Thanks, Paul

Share this post


Link to post
Share on other sites

Hi Paul, I had a SIII Daimler Sovereign with the same XK engine and suffered the same problems.

Possible causes:

1. Water pump not pumping; see if belt slips, check pulley and belt, smears are telltale, eventually a toothed belt will slip a lot less than a smooth belt

2. Water not flowing evenly and freely within the engine block - gunk? deposits over the years? You need to "wash&rinse" the waterways (*)

3. Thermostat not opening properly; replace thermostat

4. Fan turning too slowly or has too few blades (It's warmer these times compared to 50 years ago); try an 8-blade fan from the S3 Sovereigns, and/or a "blowing" electric fan (Kenlowe etc.) on the front side of the radiator (very thin and will not show through the grille)

(*) You can also consider a "waterless" cooland liquid, which will work from -40°C to +140°C; this means no issues with antifreeze in the winter and safe operating temperatures up to and beyond "off the scale" readings of your temp gauge - it's worth considering...

Click here to read about waterless coolant

Cheers,

Maurizio, Rome, Italy

[note: same post as in your earlier thread, but chances are you've abandoned that and concentrating here]

Share this post


Link to post
Share on other sites

I have a similar problem on my s-type. It’ll only overheat whilst waiting in long traffic queues. Once moving, the air flow cools engine again. Interestingly, my temp gauge never goes much above 70 when overheating? 

I wanted to know what size kenlowe fits the s-type?

neil

Share this post


Link to post
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.

Guest
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.

Loading...