overheating

darrenshaggy · Post by **darrenshaggy** » Thu Jun 04, 2015 3:40 pm

hi there ive got a 1 ltr polo 1998
had no problems with it until today the car overheated went up to max ive checked to see if airlock but i did notice the big fan on rad didnt come on ive checked normal fuses all ok has any body any ideas please need the car for work thanks shaggy

Post by **alexperkins** » Thu Jun 04, 2015 3:59 pm

Either:

A faulty thermostat (likely as these fail all the time)
A faulty fan switch in the rad

I would replace both, including the thermostat housing along with a coolant change

darrenshaggy · Post by **darrenshaggy** » Thu Jun 04, 2015 4:37 pm

ware you say housing do you mean gasket or the complete housing if so whys that ??? thanks

Post by **alexperkins** » Thu Jun 04, 2015 4:38 pm

Housing where the thermostat sits inside - it has a habit of breaking inside so the thermostat gets jammed. Its inexpensive and should always be changed if the thermostat is done, along with new gaskets.

darrenshaggy · Post by **darrenshaggy** » Thu Jun 04, 2015 4:48 pm

how do i test the fan switch please

Post by **alexperkins** » Thu Jun 04, 2015 4:50 pm

Youll have to check if the circuit closes with a multimeter - the problem is, its very hard to test that unless you attempt to overheat the car

The quickest diagnosis for this is see if the bottom radiator hose is boiling hot when youve been out for a drive. If its cold, the thermostat has failed.

darrenshaggy · Post by **darrenshaggy** » Thu Jun 04, 2015 4:59 pm

ive let it get upto 110 the top pipe is hot and bottom pipe is cold so does that mean thermostat is ok but fan didnt kick in and also wen i but car heater on hot inside fans on temp drops to almost normal

Post by **alexperkins** » Thu Jun 04, 2015 5:08 pm

The means the thermostat is broken and needs to be replaced

It means the water isnt circulating through the radiator

Get it replaced along with the housing (easy peasy) as soon as possible

darrenshaggy · Post by **darrenshaggy** » Thu Jun 04, 2015 8:16 pm

went to eurocarparts got thermostat and the housing was £30 so i took that risk removed old one and yes you very correct that it normally breaks the housing but looked on line and you can just buy the coolant flange for £7 so i guess im going to gsf to get the new bit tomorrow many thanks for your help

Post by **alexperkins** » Thu Jun 04, 2015 8:24 pm

Good news. It's best to replace the lot given how little it costs. Less chance of it failing again in future

darrenshaggy · Post by **darrenshaggy** » Thu Jun 04, 2015 8:30 pm

this is true so i done me classic mini today so i can go n get the housing tomorrow lol thanks again

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