Hi,

Bit of background info to help diagnose my problem.

Whilst on the motorway last week, my coolant temperature gauge rose rapidly so I pulled over immediately, just as steam starting coming out. Turned out be a broken thermostat, this was replaced and everything seemed ok.

Then the following day, on the motorway again, the temperature gauge shot ap again! I pulled over and discoverd the problem was a very small leak from the top of radiator. It must have burst from the overheating that happened the prevoius day and subsequently leaked. I checked the level before setting off.

So, I replaced the radiator with a used one (that doesnt leak) and still have some overheating issues. Its fine on short runs, but after a long run, the temperature will rise above normal when stationary. Both fans work fine btw. When this happens I check the bottom hose but its always cold! Suggesting the water is not circulating through the radiator. Radiator blockage?

But the odd thing is that if I go on a long run and take it easy, never exceed 60mph or 3k rpm, its fine! I check the bottom hose and its nice and warm, so water is circulating through the radiator.

Any ideas? Could it be the water pump thats slipping under high load? I was convinced there is a blockage in the radiator, but water is flowing through it fine when I take it easy.

Bit confused. Any help is greatly appreciated.

Cheers

Neil

 

Anyone

 

Can you pump water through the rad using a hosepipe?

 

Airlock happening on boost, ergo over 3k rpm and at the higher speeds??

Airlock could have been introduced when the stat was replaced... and/or when new/extra coolant was reinstated afterwards??