losing coolant

2007 SKODA FABIA
150,000 MILES • 1.9L • 4 CYL • 2WD • MANUAL
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HOWLING
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I am having coolant loss from expansion tank overflow due to high pressure in the coolant system also the car runs at normal temperature up to 60 mph then starts to overheat if I take my foot off the accelerator it returns back to normal temperature I have replaced the cap ,thermostat, radiator and water pump and I have had the system pressure tested it holds pressure with no loss. also, a sniff test which no gasses were found fan also works fine. I am at a loss any help would be much appreciated.
Aug 8, 2016 at 12:38 PM
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HMAC300
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we have no info on this car as it's not sold in US, check radiator for cold spots if you feel any the radiator is bad. also there is a chemical that can be added to also check for head gasket as it may be putting compression into the cooling system
Aug 8, 2016 at 3:55 PM
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HOWLING
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The system has been tested and no gasses were found the radiator was replaced 1 week ago
Aug 9, 2016 at 1:44 AM
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MHPAUTOS
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Have you checked the thermostat yet?
Aug 9, 2016 at 3:43 AM
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HOWLING
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Yes new thermostat- radiator and radiator Cap and water pump
Aug 9, 2016 at 8:10 AM
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MHPAUTOS
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You need to start with a pressure test to exclude any external leaks you need to use a cooling system pressure tester not just run to temp with cap on.
Aug 9, 2016 at 2:31 PM
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HOWLING
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Pressure test has been done it holds pressure
Aug 10, 2016 at 1:43 PM
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MHPAUTOS
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  • ASE Certified Mechanic
Re check the thermostat, boil it up in a pot of eater on your stove make sur eit is opening, new thermostats can be faulty.
Aug 18, 2016 at 3:45 AM
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