Q: over heating

asked by on

I have checked thermostat-was ok Back flushed rad. was clear Checked pipe work- all appears to be clear Checked electric pump and is working fine Checked for steam & water in exaust -none Looked for oil in water-none Looked for white gunk inside oil filler cap-none The engine warms up as normal on tickover. Once the car is driven the temp rises rappidly and starts to boil, the rad hoses are all hot & under presure and the expansion tank starts to emit steam and the water level inside it drops. Strangely the rad is only just warm all over. I am suspecting the pump but it is not leaking or squealing and has no play in the bearing. I have also checked for air locks and the heater blows cold and does not heat up. Any ideas please, i'm pulling my hair out even though i'm bald lol
My car has a manual transmission.

Hi there:

One thing that I’ve seen on TDI’s in the past is air bubbles trapped in the coolant lines that will create excessive heat build-up. If you combine this with a thermostat that is not opening when it should or a fan that is not turning on when it should, you could experiencing overheating issues quite easily. It’s also common for some TDI’s to develop lean fuel mixtures which will increase engine temperature. You might want to contact a local mobile mechanic so they can come to your location and complete a car is overheating inspection to help you diagnose the issue so the right repairs can be made.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. over heating

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car shaking and smoking

Hi there. The shaking and smoking issue you're experiencing may be caused by a fuel leak. Typically, if you look at your fluids or under the hood and can't see anything leaking, such as coolant, oil, or power steering fluid,...

Q: My car is in limp mode - 1997 Ford Taurus

If you cracked your oil filter and the engine pumped out all the oil and you continued to drive it, you may have damaged the internal bearing of the motor. If you perform an oil and filter change you may...

Q: My cruise control does not work - 2012 Volkswagen Passat

Your car has an electronic throttle body which is controlled by the engine electronic control unit (ECU). As such, the cruise control is incorporated into the engine management system and will not have a separate fuse. There are a few...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...