overheating

Martyn · Post by **Martyn** » Sun Nov 02, 2008 1:06 pm

I have replaced the fan switch and coolant hose on the girlfreinds R reg polo because both were leaking but now when the engine warms up, the bottom rad hose stays cold and the fan doesn't come on. I have tried my best to get any air out of the system but unless the heater is kept on full the engine will overheat - anyone got any suggestions?

lolhoward · Post by **lolhoward** » Sun Nov 02, 2008 3:33 pm

Not a mechanic but could it be the pump? Had mine go within 2 days!

Luckily bought from a VW specialist and replaced it for free.

gaz2000 · Post by **gaz2000** » Tue Nov 04, 2008 11:44 am

i would say your thermostat is the problem,seems its closed and thats why the water isnt reaching your rad.your car should get to around the 90 mark then you should notice the bottom pipe suddenly heat up.about 8 quid for a thermostat so give it a go,easy job

Post by **alexperkins** » Tue Nov 04, 2008 9:23 pm

Sounds about right Gaz

bbspolo · Post by **bbspolo** » Tue Nov 04, 2008 10:50 pm

whooooooooooo before u go replacing parts maby u should check afew things before u go changing bits because people on the internet told u 2! lol

1) remove one end of the coolant pipe coming of the top of the rad and start the engine!
It should pump water/ coolent out at u!
If it doesnt then the plastic implers on the water pump have sheered off (very common on polo;s) get the water pump and cambelt changed!

2) undo the thurmostat housing (3bolts if i rember correctly) pull the thurmostat out!
boil some water in put it into a metal pot drop them thermostat in and it should open if the water is boiling! If not your thermostat is stuck!
Now u can spend some time and unstick them but for what they cost u might as well replace it!

which ever one it is it would be worth flushing out the coolant system with a good coolant flush! you will be amazed at how much crap comes out the rad!

Good luck!