Overheating etc.

For all Carb and Injection engines, standard or modified plus non-standard engine transplants. Heads; Blocks; Cooling (including heater issues related to the cooling system); Mounts etc

Moderator:Scirocco Register

Forum rules
Hints, tips and guides for repair and modification - the FAQ section on the main website is worth checking first for information relating to common faults and technical help. Useful posts and guides will be added to the FAQ http://www.sciroccoregister.co.uk/scirocco-faq
Overheating etc.

Post by KindredSpirit » Thu Apr 02, 2009 12:45 pm

Thought this one may be helpful.
A couple of years ago I had a problem with my '86 1.8GTX. I found that the coolant header tank began to have increasing amounts of oiliness in it and the level started to go up slightly.
There wasn't a lot of 'mayonaisse' on the oil dipstick or in the rocker cover, however - so I thought that the cylinder head gasket was OK.
The engine began to overheat and the coolant warning light started to flash continually.
I took the car to my local garage and they were puzzled. They flushed the cooling system and changed the oil and filter. They said it could be a 'cracked block'. A week later the same thing started to happen until one morning on the way to work there was a loud 'pop' and a trail of steam. I immediately thought 'head gasket'.
When I stopped and opened the bonnet the top coolant hose had split wide open.
This was due to the oil mixing with the coolant and rotting the hose. I took the car to a VW specialist and they immediately found the problem. The water cooled oil cooler had broken down internally and it was from there that the oil and water had mixed together.
It cost me a new water pump, radiator, header tank, oil cooler (becoming increasingly rare) and a complete set of hoses (the small one with the branches to the oil cooler very expensive, around £40! :o ) - and by this time I had to have the head skimmed due to distortion. The other thing that they told me was that due to the oil in the coolant, the radiator mounted temperature sensor had given inaccurate readings, thus making it more difficult to see the problem.
Hope this helps. :read:

User avatar
Joined:Wed Apr 01, 2009 5:51 pm
fill in the right answer:10

Re: Overheating etc.

Post by SCOTMCDOT » Mon Apr 20, 2009 5:55 pm

Mine has started overheating today. Temp got right up in traffic so i turned on the blower full but it made little difference.

I got to work and stuck a paperclip in the connectors to the heater switch and the fan came on so its not that. I would automatically then think it is the heater switch, but this is relatively new. Therefore i am thinking Thermostat? If it was not working, could this not be telling the switch to cut in?

Going to clean up the terminals on the switch but thought i would see what others thought as i am not taking out until the traffic dies down a bit as i dont want to get stuck in traffic.