ac help
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Seasoned Member
Joined: Sep 2011
Posts: 474
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From: segoville tx
Year: 1997
Model: Cherokee
Engine: 4.0 6 cylinder
ac help
Ok i kno this is a common question.. but why is my ac switchin to defrost around 50 to 60... its too hot in texas for it to keep doing that lol.. anybody have this problem and found the solution??!!??
Thread Starter
Seasoned Member
Joined: Sep 2011
Posts: 474
Likes: 0
From: segoville tx
Year: 1997
Model: Cherokee
Engine: 4.0 6 cylinder
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Thread Starter
Seasoned Member
Joined: Sep 2011
Posts: 474
Likes: 0
From: segoville tx
Year: 1997
Model: Cherokee
Engine: 4.0 6 cylinder
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CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
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- bayerlad, 1997 Jeep Grand Cherokee, 160,000 mi
Rookie
Under acceleration when the engine pulls vacuum, the small check valve on the manifold vacuum line does not hold allowing the AC/heater directional system to default to the defrost system (no vacuum position). Check valves are netorious for failing or leaking. I was able to "stall" the problem by "cleaning" the check valce with wd40 but it is only a short term fix and will only work if the check valve is dirty and not broken. A check valve this size should cost less than $10.00 but buyer beware... it is probably a "special" component and may cost more???
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Thread Starter
Seasoned Member
Joined: Sep 2011
Posts: 474
Likes: 0
From: segoville tx
Year: 1997
Model: Cherokee
Engine: 4.0 6 cylinder
Follow this Problem Report Unfollow this Problem Report
[*]bayerlad, 1997 Jeep Grand Cherokee, 160,000 mi
Rookie
Under acceleration when the engine pulls vacuum, the small check valve on the manifold vacuum line does not hold allowing the AC/heater directional system to default to the defrost system (no vacuum position). Check valves are netorious for failing or leaking. I was able to "stall" the problem by "cleaning" the check valce with wd40 but it is only a short term fix and will only work if the check valve is dirty and not broken. A check valve this size should cost less than $10.00 but buyer beware... it is probably a "special" component and may cost more???
Flag This
Like | 3 people like this3
[*]bayerlad, 1997 Jeep Grand Cherokee, 160,000 mi
Rookie
Under acceleration when the engine pulls vacuum, the small check valve on the manifold vacuum line does not hold allowing the AC/heater directional system to default to the defrost system (no vacuum position). Check valves are netorious for failing or leaking. I was able to "stall" the problem by "cleaning" the check valce with wd40 but it is only a short term fix and will only work if the check valve is dirty and not broken. A check valve this size should cost less than $10.00 but buyer beware... it is probably a "special" component and may cost more???
Flag This
Like | 3 people like this3