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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: JetPo on August 27, 2008, 10:44:08 am

Title: Coolant Pressure Problem
Post by: JetPo on August 27, 2008, 10:44:08 am

I have a 98 TDI in my mk2 Jetta. Its fully mecanical with AAZ pump and K24 turbo. I realised that even after sitting for 12h in my driveway, there is still a lot of pressure in my coolant ( when i open my ''bol'' its squirts everywhere ...) . What could be the problem ? My temperature stais good ...

Thanks
Alex

Title: Coolant Pressure Problem
Post by: jtanguay on August 27, 2008, 11:08:47 am

do this test:  release pressure from the bowl by opening the cap.   (motor should be let cool down a lot, maybe even overnight) put the cap back on, and start the motor.  let it run for about 1-2 minutes, and shut off.  now open the cap and see if it built up pressure.  if there is pressure, then you have a leak into the coolant system.

but i'm thinking that you might just have a problem with the expansion cap.  they're supposed to 'breathe' a little bit to reduce pressure.  if yours isn't, then that could explain all that pressure inside.

Title: Coolant Pressure Problem
Post by: JetPo on August 27, 2008, 11:33:48 am

Quote from: "jtanguay"

do this test:  release pressure from the bowl by opening the cap.   (motor should be let cool down a lot, maybe even overnight) put the cap back on, and start the motor.  let it run for about 1-2 minutes, and shut off.  now open the cap and see if it built up pressure.  if there is pressure, then you have a leak into the coolant system.

but i'm thinking that you might just have a problem with the expansion cap.  they're supposed to 'breathe' a little bit to reduce pressure.  if yours isn't, then that could explain all that pressure inside.

Ok, thanks, ill do the test tonight  :D

Title: Coolant Pressure Problem
Post by: JetPo on September 02, 2008, 03:54:02 pm

Ok, so i did the test, let the pressure out at night, let the car stand for the night. Next morning, put some coolant back in, close cap and let the motor run for about 5min. ... there was some pressure  :oops:  So that meens i have a F!"/$%/$%ing leek  :evil:  Head gasket ? Help please  :(

Title: Coolant Pressure Problem
Post by: VW_Commuter on September 02, 2008, 04:24:35 pm

If there is no oil in the coolant you can rule out the oil cooler so I would say it's the headgasket.  If you've caught it early enough it shouldn't have had a chance to do any damage to the seating surfaces on the head or block but the only way to find out is pull the head and inspect.

Title: Coolant Pressure Problem
Post by: JetPo on September 02, 2008, 04:26:06 pm

Quote from: "VW_Commuter"

If there is no oil in the coolant you can rule out the oil cooler so I would say it's the headgasket.  If you've caught it early enough it shouldn't have had a chance to do any damage to the seating surfaces on the head or block but the only way to find out is pull the head and inspect.

The head gasket was changed like 5000km ago ... ***

Title: Coolant Pressure Problem
Post by: jtanguay on September 02, 2008, 07:56:17 pm

before you start thinking the worst, maybe you just need to have the head bolts re-torqued???

Title: Coolant Pressure Problem
Post by: zukgod1 on September 03, 2008, 07:52:55 am

Quote from: "jtanguay"

before you start thinking the worst, maybe you just need to have the head bolts re-torqued???

I would try this first just to see..

Title: Coolant Pressure Problem
Post by: zukgod1 on September 03, 2008, 07:53:20 am

Quote from: "JetPo"

Quote from: "VW_Commuter"

If there is no oil in the coolant you can rule out the oil cooler so I would say it's the headgasket.  If you've caught it early enough it shouldn't have had a chance to do any damage to the seating surfaces on the head or block but the only way to find out is pull the head and inspect.

The head gasket was changed like 5000km ago ... fu@*

Fixed that for ya ;)

Title: Coolant Pressure Problem
Post by: JetPo on September 03, 2008, 12:57:15 pm

Quote from: "zukgod1"

Quote from: "JetPo"

Quote from: "VW_Commuter"

If there is no oil in the coolant you can rule out the oil cooler so I would say it's the headgasket.  If you've caught it early enough it shouldn't have had a chance to do any damage to the seating surfaces on the head or block but the only way to find out is pull the head and inspect.

The head gasket was changed like 5000km ago ... fu@*

Fixed that for ya ;)

Thanks ;) And for the retorquing ill give it a trie