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Old 08-14-2007, 08:25 PM
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Join Date: Jun 2007
Posts: 97
Coolant-flush now a/c problems

Flushed my entire cooling system. Now when I run a/c it's not as cold as it used to be. I can feel hot air comming from the defrosts vent and at the floor level vents . Whats up? 85 300SD 617 126 Checked a/c charge ,it's OK.

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Old 08-14-2007, 09:15 PM
rrgrassi's Avatar
mmmmmm Diesel...
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,122
Sounds like the mono valve diaphragm is either cracked, or the mono valve is not working. It needs 12v to stay closed.

70's Southern Pacific #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 133K miles-replaced the other '06 that quit after 300k miles. (did not catch the bad cam in time)

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 195K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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Old 08-14-2007, 09:55 PM
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Join Date: Jun 2007
Posts: 97
Were is the mono valve? And how do I fix it?

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