Paul Haskey

Classic S Type Overheating Problem

Recommended Posts

Hi

My temperature gauge goes up to around 80% on journeys.  The fan seems to be working ok and there is plenty of coolant in the system.  I've been advised to check the temp of the water in the rad with a thermometer to see if the gauge is working.  The engine has had a lot of work done so I don't think there's anything major going on, but the rad feels a bit furred up in the neck.

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

Share this post


Link to post
Share on other sites

 Thank you Maurizio, you’re a gent. At one garage, people working on the car found that there was no thermostat in there and replaced it.  I think it was taken out to resolve an earlier overheating problem. I have had the radiator re-cored and a new cap put on and although the bottom half of the radiator cowl is missing I don’t think there is a coolant flow problem .

You have given me some good points to consider here, but I think it might be something as simple as having the thermometer re-calibrated, along with some of the other instruments.  It’s not now boiling over like it was

Thanks again, Paul

 

 

Share this post


Link to post
Share on other sites

I have a 1948 MK V that had overheating problems. A friend suggested using Evapo-rust. I drained the coolant, flushed the system twice with water, then filled the system with Evapo-rust that I ordered from Home Depot,  $80 for a 5gal pail. I ran this for a month using the car every day. Each day I noticed the gauge being lower. Once it was running normal, I drained the Evapo-rust back into its pail to use later in another vehicle. I then flushed twice again today and filled with antifreeze. It works great, No overheating now at all! Evapo-rust does not eat aluminum, gaskets or effect the water pump.

 I highly recommend this product.

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...