Haunted heater controls

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May 11, 2014 | 06:29 AM

#16

asavage

FTE Community Team

Joined: Nov 2001

Posts: 1,866

Likes: 274

From: Oak Harbor, Washington

Two years ago I had replaced that check valve with a JY unit off some random Ford. Thing was, it had an extra tap. I had a pack of vacuum caps I'd recently purchased for a friend's car, so I slipped a cap on the extra tap.

Fast forward two years, I had divert-to-Defrost on hills again last week. I took a look at that check valve, and the cap had failed.

Cheap Chinese crap. How hard is it to make a vacuum cap that last longer than two years?

Click HERE for larger

Click HERE for larger

I used a glob of RTV this time 'round.

May 11, 2014 | 08:28 AM

#17

Jose A.

Fleet Mechanic

Joined: Apr 2003

Posts: 1,460

Likes: 6

From: Florida

I started having this same symptom after disconnecting the vacuum line to the check valve while I did the Upper Intake Gasket repair in the '97 4.0.

I too have been checking that little check valve, the funny thing is that my 1984 Jaguar displays identical symptoms caused by an identical check valve.

so I remembered years ago, a Jaguar mechanic taught me a trick: put the check valve in a pan of almost boiling water for some 15 minutes. (ALMOST BOILING/HOT). Then blow through it, because usually some debris has gotten stuck in it or in the line to it and there is a ball inside which gets "lazy".

I did the same to my Aerostar this week and the sympton has dissapeared.

So try putting it in a pan of hot water (but not so hot as to melt the plastic).