1992 Mazda Miata upper raideator hose

Tiny
JASONSCOTT619
  • MEMBER
  • 1992 MAZDA MIATA
  • 4 CYL
  • 2WD
  • MANUAL
  • 120,000 MILES
After the car has been parked over night the upper hose on the raideator is flat like it has sucktion & if I take the raideator cap off air get`s sucked in. Do you have any ideas?
thank you for your time
Saturday, June 6th, 2009 AT 5:35 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

The return valve in the radiator cap is faulty and this is causing a vacuum to build up in the cooling system as it cools causing the hose to collapse, replace the faulty cap.

Mark (mhpautos)
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Saturday, June 6th, 2009 AT 6:46 PM

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