Question about Cars & Trucks
If your radiator coolant is boiling then do not drive as your car could/will overheat and cause some serious damage
The temperature gauge in the Mk4 Golf is'nt that accurate, it will usually stay in the middle until you've got a major problem, where the coolant is boiling and expanding so if it's just slightly overheating, the gauge could show as normal.
The problem could be caused by numerous things such as a leak/crack in the coolant system and isn't pressurized such as a faulty coolant bottle cap not sealing properly, could be a problem with the fans, or and issue with the temp sensor /thermostat can cause confusion. It's hard to diagnose without seeing. I would take it into a garage for further inspection.
Posted on Feb 28, 2014
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Posted on Jan 02, 2017
Double check that your rad cooling fan is operating as it should, but after that, I'd be looking at a good rad flush, or rad replace. Believe it or not, your heater core is like a small rad, and when you turn the heater on, it actually cools the circulating coolant, slighly,and therefore shows a difference on your gauge. Like I said, make sure the rad fan is coming on when engine temperature is at normal or slightly higher, and if it is, then I'd be taking a close look at my radiator, especially if it wasn't replaced when headgasket was done.
Posted on Aug 27, 2008
The thermostat will show what the guage shows. the seal on the coolent bottle can be checked for tightness. so it could be a faulty sensor?
Posted on Apr 28, 2009
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