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Engine Specific Info and Questions => IDI Engine => Topic started by: nissannx on February 11, 2015, 11:33:58 am

Title: Vacuum in coolant system
Post by: nissannx on February 11, 2015, 11:33:58 am

92 jetta 1.6 na

When I top up my coolant every 2-3 weeks it is really hard to take the cap off then coolant rushes back into the reservoir.

What causes the vacuum?

Title: Re: Vacuum in coolant system
Post by: burn_your_money on February 11, 2015, 01:29:37 pm

Sounds like a faulty cap to me.

As the system cools down, it depressurizes and the cap is suppose to open to let the vacuum out.

I think VWs do this anyways...

Title: Re: Vacuum in coolant system
Post by: nissannx on February 11, 2015, 02:25:03 pm

It's the blue cap. Brand new 4 months old max

Title: Re: Vacuum in coolant system
Post by: RunninWild on February 11, 2015, 02:30:19 pm

caps are cheap, I'd grab another and see if it fixes the problem.