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Tiny
NYP1973
  • MEMBER
  • 2007 NISSAN
Hi. I have a Nissan Dualis (Qashqai) 2.0 liter. Recently I have a problem with the car where it wouldn't start. Accidentally I discovered that there is pressure in the coolant tank (the one connected to the radiator) and if I release that pressure the car will start and run normally. If I don't release the pressure and I let it accumulate, a few days later the car will not start. Is the pressure in the coolant tank normal and, if yes, what could be the cause of the problem?
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Monday, March 4th, 2013 AT 9:55 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
We do not have any information on your vehicle so I do not know the system used but as far as I understand, Nissan do not use the closed system therefor there should be no pressure in the recovery tank.

The other thing is I don't understand why this pressure has anything to do with non starting.

If you can post some picture of the coolant tank and the radiator, I might be able to understand the reason for the pressure accumulating.
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Monday, March 4th, 2013 AT 6:29 PM
Tiny
NYP1973
  • MEMBER
  • 3 POSTS
Hi thanks for the reply. I've attached 2 pics for your ease. The reason that I mentioned the pressure is because that's the only logical explanation. If I don't release the pressure every time I stop the car it will go for a maximum of a week and then at some point it won't start.
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Thursday, March 7th, 2013 AT 11:08 AM
Tiny
KHLOW2008
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  • 41,815 POSTS
This is a closed loop system and there would be pressure in system but it should not build up too much. Check the radiator cap and you should try replacing it.
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Thursday, March 7th, 2013 AT 12:34 PM
Tiny
NYP1973
  • MEMBER
  • 3 POSTS
Thanks. You suggest to replace the radiator cap but I thought it might be the plastic coolant tank cap that might need replacement. Is any of the two made so they would release some pressure?
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Friday, March 8th, 2013 AT 10:01 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Sorry, I meant the coolant tank cap. I don't think there is any other radiator cap present in system.
A bad cap can result in excessive pressure in system.
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Friday, March 8th, 2013 AT 12:07 PM
Tiny
SAFIAN ABDIN
  • MEMBER
  • 4 POSTS
Sorry im new user and in wrong page
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Sunday, August 6th, 2017 AT 12:51 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
No Problem :)
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Monday, August 7th, 2017 AT 2:08 PM

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