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        General >> Problems >> Heater/Aircon stops circulating air
        
(Message started by: tpb on Jan 3^rd, 2009, 11:08am)

Title: Heater/Aircon stops circulating air
Post by tpb on Jan 3^rd, 2009, 11:08am

When first started the system works well, but after 30-60 minutes nothing comes through the vents (hot or cold), although the blower motor continues to work.

Re programming does nothing.

The car is 2.3 Ultima 1998.

Help/advice will be appreciated.

Title: Re: Heater/Aircon stops circulating air
Post by Simmo on Jan 3^rd, 2009, 1:00pm

Try the test procedure HERE (http://www.fordscorpio.co.uk/hbctest.htm)

Title: Re: Heater/Aircon stops circulating air
Post by scorpio_man on Jan 3^rd, 2009, 1:34pm

hi there

if no air is blowing (hot or cold), i'd think the evaporator is freezing up, due to a faulty thermistor.

see the main site page... http://www.fordscorpio.co.uk/deicetest.htm

hth

Title: Re: Heater/Aircon stops circulating air
Post by tpb on Jan 5^th, 2009, 4:46am

(quote )
"if no air is blowing (hot or cold), i'd think the evaporator is freezing up, due to a faulty thermistor."

The problem occurs when I'm running the heater as well as when the air condtioning is on. Could the evaporator freeze up when the heater is running?

Title: Re: Heater/Aircon stops circulating air
Post by Snoopy on Jan 5^th, 2009, 8:28am

IN Short Yes because the evaporator is BEFORE it gets to the heat exchanger .

Try switching the A/C Off and see what happens it might give you and us a clue /

Title: Re: Heater/Aircon stops circulating air
Post by tpb on Jan 7^th, 2009, 4:44am

The same thing happens when I switch off the aircon and just run the heater. It works well for anywhere between 30 and 90 minutes, then the airflow through the vents dies to nothing. It sounds as though the motor and fan are still running at full blast although no air whatsoever is coming through.
If I leave it off for a while and then turn it back on, it will start to work again for a short period.

Title: Re: Heater/Aircon stops circulating air
Post by Simmo on Jan 7^th, 2009, 7:41am

Have you had the pollen filter out to see what state it is in??.

Title: Re: Heater/Aircon stops circulating air
Post by gozz on Jan 7^th, 2009, 8:50am

tpb.
Is the aircon compressor definitely stationary when you switch it off,is the clutch jammed ? as scorpio_man says,it does smack of a faulty de-ice switch.
GOZZ.

Title: Re: Heater/Aircon stops circulating air
Post by scorpio_man on Jan 7^th, 2009, 9:38am

hi there

also if the air direction is at demist position, the a/c is still on even if the green light is off.

hth