4720 A/C Tips and Code 73

705 Views 3 Replies 2 Participants Last post by Weed Free, Aug 6, 2021

Weed Free

Discussion Starter · Jul 31, 2021

Over the last couple of years my a/c has been not fully putting out the way it should. After cleaning cab filter and blowing out dust in evaporator also found heater selector was allowing some flow that didn't help. I finally found the problem. I removed the intercooler and found the center of the condenser plugged. I blow the radiator and oil cooler often but wasn't getting the pressure to the a/c condenser . Once it was cleaned the a/c was back to normal. Tip I made a nozzle from a 1/8 stainless steel air nozzle flattened with a hammer drilled 2 3/32 holes in it now I can slide in to blow out condenser.
Another problem I have is code 73. Does anyone know what causes that code?

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arlen

· #2 · Jul 31, 2021

Weed Free said:
Over the last couple of years my a/c has been not fully putting out the way it should. After cleaning cab filter and blowing out dust in evaporator also found heater selector was allowing some flow that didn't help. I finally found the problem. I removed the intercooler and found the center of the condenser plugged. I blow the radiator and oil cooler often but wasn't getting the pressure to the a/c condenser . Once it was cleaned the a/c was back to normal. Tip I made a nozzle from a 1/8 stainless steel air nozzle flattened with a hammer drilled 2 3/32 holes in it now I can slide in to blow out condenser.
Another problem I have is code 73. Does anyone know what causes that code?

Looks like the output from the computer that fires the starter relay.
Maybe a bad relay, or a loose connection.

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Weed Free

Discussion Starter · #3 · Aug 1, 2021

arlen said:
Looks like the output from the computer that fires the starter relay.
Maybe a bad relay, or a loose connection. View attachment 797759

Thank you I will check

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Weed Free

Discussion Starter · #4 · Aug 6, 2021

Weed Free said:
Over the last couple of years my a/c has been not fully putting out the way it should. After cleaning cab filter and blowing out dust in evaporator also found heater selector was allowing some flow that didn't help. I finally found the problem. I removed the intercooler and found the center of the condenser plugged. I blow the radiator and oil cooler often but wasn't getting the pressure to the a/c condenser . Once it was cleaned the a/c was back to normal. Tip I made a nozzle from a 1/8 stainless steel air nozzle flattened with a hammer drilled 2 3/32 holes in it now I can slide in to blow out condenser.
Another problem I have is code 73. Does anyone know what causes that code?

Code 73 Fixed Cleaned ground strap from cab to frame also cleaned the multiple ground cables just below and to the left of oil filter. Mowed 10 hrs yesterday no 73 code and typically it would have come up every 10 minutes

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