Air conditioning blows hot has full charge refrigerant

MANDATUCKER

MEMBER
2013 FORD FUSION
2.0L
4 CYL
2WD
AUTOMATIC
127,000 MILES

What would cause my AC to blow hot even though refrigerant is fully charged? Also, my external temperature on instrument cluster and radio panel shows negative when starting then goes to fifty degrees and stays there. What can be done to fix these problems?

Tuesday, March 27th, 2018 AT 7:02 PM

5 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good morning.

When you change from heat to cool, can you hear the mode door move in the dash? It may be the blend door motor that is not working correctly.

As far as the temperature readings, it may be the ambient temperature sensor may be bad not sending the correct reading.

Roy

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Wednesday, March 28th, 2018 AT 3:47 AM

MANDATUCKER

MEMBER
3 POSTS

The AC will work one minute then blow hot.

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Wednesday, March 28th, 2018 AT 4:21 AM

ASEMASTER6371

MECHANIC
52,796 POSTS

Okay thanks.

You will need a set of gauges to monitor the pressures of the AC system. There may be a malfunction in the pressure side of the AC system.

You can rent a set of gauges from a parts store and hook them up and then I need to see what the high and low pressure is while running.

Roy

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Wednesday, March 28th, 2018 AT 4:45 AM

MANDATUCKER

MEMBER
3 POSTS

I read somewhere else it could be the air conditioning (A/C) evaporator discharge air temperature sensor. Where is that located on my car?

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Wednesday, March 28th, 2018 AT 4:51 AM

ASEMASTER6371

MECHANIC
52,796 POSTS

On the evaporator assembly itself. That is not the issue. That is what cuts off the compressor when the evaporator is too cold. It prevents ice build up on the evaporator.

You need to check the pressures. That is where we need to start.

Roy

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Wednesday, March 28th, 2018 AT 4:57 AM