Need an A/C education please

Started by 48ford, July 15, 2005, 11:17:09 PM

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48ford

On my everyday driver(1994 F-250) the a/c is not working good,and i see that the expantion valve is all iced up.
What is the problem and how do I fix it.
thanks Russ&Irene

HOTRODSRJ

Quote from: "48ford"On my everyday driver(1994 F-250) the a/c is not working good,and i see that the expantion valve is all iced up.
What is the problem and how do I fix it.
thanks Russ&Irene

Usually icing is a sign of low frigerant believe it or not.  I know....most would think the other way around but there is not enough cooling media (refrigerant) to remove heat effectively.  So, ice you get usually inside at the evap.

Does it work just for a matter of minutes then quits?  This is the sign.
STEVE "JACKSTANDS" JACK

48ford

Quote from: "HOTRODSRJ"Usually icing is a sign of low frigerant believe it or not.  I know....most would think the other way around but there is not enough cooling media (refrigerant) to remove heat effectively.  So, ice you get usually inside at the evap.

Does it work just for a matter of minutes then quits?  This is the sign.
Yes it works but not good.
I will see if it is low on 134.
Thanks Russ&irene

EMSjunkie

You might want to check for a
resistance to air flow.
that can cause an icing condition.

possible blocked evap.
i think  :?


Vance
"I don\'t know what your problem is, but I bet its hard to pronounce"

1934 Ford 3 Window
Member, Rural Rodders
Member, National Sarcasm Society  "Like we need your support"
*****Co-Founder  Team Smart*****

entodad

Sounds like low 134a.  There might be no other problem other than low refrigerant because 134a is notorious for migrating through the hose.
(134a is a very small molecule)
Doug :roll:
Quote from: "EMSjunkie"You might want to check for a
resistance to air flow.
that can cause an icing condition.

possible blocked evap.
i think  :?


Vance
WaChiss......(famous last hillbilly word)

Ed ke6bnl

Quote from: "HOTRODSRJ"
Quote from: "48ford"On my everyday driver(1994 F-250) the a/c is not working good,and i see that the expantion valve is all iced up.
What is the problem and how do I fix it.
thanks Russ&Irene

Usually icing is a sign of low frigerant believe it or not.  I know....most would think the other way around but there is not enough cooling media (refrigerant) to remove heat effectively.  So, ice you get usually inside at the evap.

Does it work just for a matter of minutes then quits?  This is the sign.

They will ice up when low the pressures get lower and the refrigerant is colder then you loose enough and that ice is gone and it will go off on a  low pressure swith.
1948 F3, parts
1950 F1 SteetRod,
1949 F1 V8 flathead stocker
1948 F6 V8 SBC,
1953 Chevy 3100 AD pu future project& 85 s10 longbed for chassis
1972 Chopped El Camino daily driver
1968 Mustang Coupe
1998.5 Dodge 4x4 cummins 4door, 35"bfg,