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?
Monday, March 4th, 2013 AT 9:55 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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
  • MECHANIC
  • 41,814 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
  • 41,814 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
  • 54,144 POSTS
No Problem :)
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Monday, August 7th, 2017 AT 2:08 PM

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