Question about Volkswagen GTI
Here are the cooling system diagnostic steps...First does the cooling fan kick on (with engine hot)? If not, check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself (there are three terminals,,, one high, one low and ground). With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay. If the cooling fan system is working normally and you still are overheating, the next thing to check is for coolant flow. let the engine cool and remove the reservoir cap and start it and let it run to operating temp. The upper hose should warm up and you should see a thin stream of coolant entering the reservoir... if not let it cool again, raise the vehicle, place a drain pan beneath the engine and remove the T-stat from the housing and button it back up. run again to operating temp... if you now have flow, and it doesn't overheat it was the 'stat. If it still overheats look at the water pump... is it noisy while running? is it weeping coolant? if so replace the pump. if not it's time to suspect a radiator blockage... try backflushing, if it seems to take alot of pressure and very little come out the other outlet the radiator is at least partially clogged and should be rebuilt or replaced... Hope this helps...;-)
Posted on Apr 15, 2009
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Posted on Jan 02, 2017
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