3.2 coolant leak problem

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lucamax
Frischfleisch
Beiträge: 8
Registriert: Sonntag 19. Januar 2020, 06:05
Fahrzeug: Frontera B 2,2 Gasoline

3.2 coolant leak problem

Beitrag von lucamax » Montag 4. Mai 2020, 12:20

A couple of months ago I bought a 1999 3.2 Frontera and drive it home by 1000 km ,
The previous owner warn me that there was a leak from the thermostat.
During the 1000 km travel I did notice any coolant leak.

I spent some weeks getting the back of the car from rust and making new brake lines.
I notice that the coolant level was going down and all the under of the motor had coolant drops.

Yesterday I decide to change the thermostat and this is what I found...
gkrellShoot_04-05-2020_115407.jpg


The thermostat had a generous layer of motor paste evidently to try to stop the leak.
gkrellShoot_04-05-2020_115426.jpg
Analisys:
Since there was not an increase of leak during drive when the pressure of the cooling circuit increase I think it is not the thermostat gasket .
The leak happens little by little when the car is still.
The reason is because when the car drives the raise of temperature tends to make evaporate the coolant in the sort of pool at the motor base, when it stops it continues to leak until it reach enough level to overflow.

Repair:
I plan to replace in any case the thermostat and his gasket but I think that the problem could be the heat pipe seals.
gkrellShoot_04-05-2020_115446.jpg
Unfortunately these seals are really hard to find.

What are your suggestions ?

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Marco.Schmühl
Abhangjäger
Beiträge: 338
Registriert: Dienstag 31. August 2004, 13:38
Fahrzeug: Frontera A Sport
Wohnort: Erftstadt

Re: 3.2 coolant leak problem

Beitrag von Marco.Schmühl » Mittwoch 27. Mai 2020, 21:54

Hi Lucamax,


did you already check 7zap? On basis of the GM spare part number you are maybe able to find suitable OEM parts?

Regards,
Marco

lucamax
Frischfleisch
Beiträge: 8
Registriert: Sonntag 19. Januar 2020, 06:05
Fahrzeug: Frontera B 2,2 Gasoline

Re: 3.2 coolant leak problem

Beitrag von lucamax » Donnerstag 28. Mai 2020, 09:27

Hi,
the stock seals are no more available , P/N 9095612250 , 9095612200
The Isuzu replacements are standard O-rings.

The leak was on the thermostat bypass hoses, I have change all of them.
gkrellShoot_28-05-2020_093715.jpg
I discoverer it after removing the plenum intake and put the coolant circuit under pressure.

The most difficult is to unmount the EGR nut and mount again fuel hose.
The trick is to lift the plenum a couple of centimeters to have more space.

I was quite surprized by the 2,5 kg/meter torque for the 8 plenum bolts, that is really a lot.
gkrellShoot_17-05-2020_090352.jpg

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