trouble with kp overheating on warmup

[RED TOP MR 2]

when warming up my starlet it overheats the 4k.the thermostat was working fine at the start of the week.its my 3rd one this year.any idea what rooting them?

[Dell'Orto]

Cooling system full of gunk?

[rollaholic]

what makes you think the thermostat is buggered?

[RED TOP MR 2]

going to give the system a good flush looks kinda gunky.think it may be the thermostat as it seems to mainly effect the car on warmup which is where its regulating the temperature

[d1 mule]

buy another 4k they are like $2.50

[Bling]

buying another 4k might not fix it, could be one majorly blocked radiator. A couple of good flushes might sort it.

You can test thermostats by sitting them in a cup of boiled water and checking it opens when the waters hot and closes when the water cools enough

[ollieboy]

buy another 4k they are like $2.50

They are actually getting pretty hard to find in cheap unmolested condition now.

[RED TOP MR 2]

no luck with the thermostat in the cup of boiling water did nothing.so im runnig with out it.coling system seemed clean but gave it a good flush anyway.