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Randall C
Randall C, ASE MasterTechnician
Category: Ford
Satisfied Customers: 12720
Experience:  35 years ASE Master Tech, Diagnostic , Electrical Specialist
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Ford F350 SuperDuty Pickup 4x4: Where is the a/c relay switch

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Where is the a/c relay switch located at on a 1999 F350 7.3 diesel pickup
Hello, My name isXXXXX will do my best to assist you.

Unsure what you refer to "ac relay switch"

can you reword or send what is not working etc
Customer: replied 4 years ago.
When we are driving AC works great, then the AC will stop blowing cool air and the blower keeps blowing, then in a little bit AC will start blowing old air again
the thing here is :

is it a behind the dash problem like blend door>?

or is the comprerssor 100% kicking off?

do you know if compressor stops or just know stops blowing cold air

have you tried anything to fix this
Customer: replied 4 years ago.
Air keeps blowing the entire time but the cool quits and then comes back. We have not tried anything but we were told it may be AC relay.
well. it could be the compressor cycling switch. there is no compressor relay on this model

the cycling switch is what turns compressor on/off as needed based on pressures

The freon could be low as well. Without knowing the pressure readings, I cant say for sure, but even if slightly low, can cause this

the other thing is about the compressor, is it really turning on/off when the problem happens OR a blend door motor behind dash could be failing

I lean more to compressor shutting off but you have not confirmed this

so.. you can try the clutch cycle switch. If no work, then need gauges hooked up for pressures.

switch is in the drier as shown in the picture

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