I have a '98 Windstar with rear air. The rear air now blows out of
the floor as if it is on the heater selection and is intermittently
blowing hot air also. This happens regardless if the front control is
selected or the rear control.
Can anyone out there tell me what to look at replacing first? I am
competent enough to go to the dealer and get the part and replace it
myself. It looks as if I can get to all the electronic gear by
pulling the side panel off. I really appreciate any help.
I had a similar problem recently in my E150. While I was underneath the
chassis replacing twenty feet of heater hose I discovered a valve that
controls the water flow to the rear heater coil. It is controlled by a
vacuum line. That vacuum line had deteriorated and rendered the valve
ineffective. Consequently, hot water was always flowing through the rear
heater coil regardless of any environmental control selection.
The repair of the vacuum line also seems to have remedied the premature
step-down of the A/C whenever driving uphill.
I would suggest you chase your rear heater hoses until you find a vacuum
Rodney Hyde wrote:
Had a similar problem and it was a broken vacuum line. If you only have air
venting from the window defrost no matter what front vent selection you make
than it is a vacuum line, this is the default vent position. My break was
under the hood right in front of the passenger seat, I was told by a
mechanic that that is the most common break area. There is a vacuum line
that comes off from the back of the engine and runs to the right side of the
van (when looking from the front) it connects into a three way connector.
One of the connections goes into the large black container on the passenger
side the other goes into the firewall. The only problem I had was feeling
around behind the container as I couldn't see were the hose went onto when I
had it off, otherwise it was easy took 15 minutes to fix.
Hope this helps.
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