Losing coolant

Tiny
HOWLING
  • MEMBER
  • 2007 SKODA FABIA
  • 1.9L
  • 4 CYL
  • 2WD
  • MANUAL
  • 150,000 MILES
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.
Monday, August 8th, 2016 AT 12:38 PM

7 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
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
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Monday, August 8th, 2016 AT 3:55 PM
Tiny
HOWLING
  • MEMBER
  • 4 POSTS
The system has been tested and no gasses were found the radiator was replaced 1 week ago
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Tuesday, August 9th, 2016 AT 1:44 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Have you checked the thermostat yet?
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Tuesday, August 9th, 2016 AT 3:43 AM
Tiny
HOWLING
  • MEMBER
  • 4 POSTS
Yes new thermostat- radiator and radiator Cap and water pump
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Tuesday, August 9th, 2016 AT 8:10 AM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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.
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Tuesday, August 9th, 2016 AT 2:31 PM
Tiny
HOWLING
  • MEMBER
  • 4 POSTS
Pressure test has been done it holds pressure
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Wednesday, August 10th, 2016 AT 1:43 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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.
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Thursday, August 18th, 2016 AT 3:45 AM

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