1992 Mazda Miata upper raideator hose

1992 MAZDA MIATA
120,000 MILES • 4 CYL • 2WD • MANUAL
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JASONSCOTT619
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  • 1 POST
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
Jun 6, 2009 at 5:35 PM
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MHPAUTOS
  • ✓ASE Certified Mechanic
  • 31,937 POSTS
  • ASE Certified Mechanic
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)
Jun 6, 2009 at 6:46 PM
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