1992 Mazda Miata upper raideator hose

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

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)