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Coolant Bleeding

Eric S

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Hi Spec Z'ers,

I have a 2003 track model that I am thoroughly enjoying now that I have been able to get it on track. One thing I definitely did not enjoy while prepping it though was bleeding the coolant system! Not only did it take forever, it also made a HUGE mess. I flushed the coolant system and replaced it with water not realizing just how much of a pain in the ass it is to bleed the coolant system. I live in Colorado and my garage is neither heated nor is it insulated, so it definitely gets below 32 degrees come winter. This means I definitely need to drain the water from the system before winter freezes come, and will need to refill it in spring.

My question is: how do you guys go about making this job not suck as hard? I got one of those coolant bleeding kits form AutoZone that has the huge funnel and the extender to make it the highest point in the cooling system. While this eventually allowed me to get all of the air bubbles out, I'm not really looking forward to repeating the process.

I was watching a YouTube video of a couple guys who use one of those systems that use an air compressor to create a vacuum in the coolant system and it essentially "sucks" all the water/coolant into the system. Supposedly this prevents air bubbles from getting trapped since it draws the vacuum, but I've been fooled by claims like this before. Does anyone have one of these systems? If so, does it work as advertised?

Thanks in advance for any suggestions!

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  • 3 weeks later...
On 6/16/2021 at 7:15 PM, chinotalk said:

Hey chinotalk,

Thanks for the link. I'm familiar with how to bleed the cooling system, the problem is that the VQ35DE is notoriously difficult to fully bleed without getting air pockets in the cooling system. Also, it makes a HUGE mess. I was hoping that some fellow VQ/Z owners may have some tips on how to bleed the system effectively without making a huge mess every time.

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