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1999 Sterling dump truck. A/C problems. A/c blows cold then…

Customer Question
1999 Sterling dump truck...

1999 Sterling dump truck. A/C problems. A/c blows cold then start blowing hot. gotta turn off and wait a minute then turn it back in then it blow cold again

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Heavy Truck Mechanic I'm going to connect you with knows all the tricks and shortcuts.

Ok

Mechanic's Assistant: Are you fixing your truck yourself? What have you tried so far?

We changed hi pressure switch, low pressure switch, and blower motor resistor

Mechanic's Assistant: Anything else you want the truck mechanic to know before I connect you?

Thats it and its full on Freon

Submitted: 11 months ago.Category: Medium and Heavy Trucks
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Answered in 2 hours by:
9/7/2017
Technician: Andy, Truck Diagnostic Technician replied 11 months ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,033
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified

Hi there . My name is ***** ***** Sounds like you may not have enough air flow going through evaporator causing it to ice up. Have you replaced the fresh air filter ? Or removed it to see if it is any better? Also , does it seem to cool better when in Max ac ? If so , this proves it because in that mode , it was recirculate the air inside and use a different filter.

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Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,033
2,033 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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