Ranger AC blows hot air on highway

MrHawk · Jun 21, 2012

Ford Ranger has new compressor and pressure has been tested by a Ford Mechanic. The air blows cold during city driving and at idling. However, on the highway as soon as the temperature gauge goes slightly above middle it blows hot air. Once the temp gauge goes middle or below cold air comes back.
Any suggestions would be appreciated.

freedom5 · Jun 22, 2012

MrHawk said:
Ford Ranger has new compressor and pressure has been tested by a Ford Mechanic. The air blows cold during city driving and at idling. However, on the highway as soon as the temperature gauge goes slightly above middle it blows hot air. Once the temp gauge goes middle or below cold air comes back.
Any suggestions would be appreciated.

If it has an accumulator there is a pressure switch mounted at the outlet. If so the compressor clutch circuit goes through this pressure switch. You can disconnect the plug on the pressuer switch and put a jumper across the terminals then test drive it. If it works this way - replace the pressure switch. It's rather inexpensive and you don't have to blow the charge as the switch has a schrader valve where it disconnects.

--weezl-- · Jun 22, 2012

there is also, on some models, a valve that blocks the coolant flow to the heater core, it allows coolant to go through the core when the heat is on, and blocks it for ac, it is vac controlled, this might also be your issue...

i would say if the above test proves fruitless, check that out... might be stuck open, or partially open...

Ranger AC blows hot air on highway

MrHawk

10+ Year Member

freedom5

10+ Year Member

--weezl--

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