Need advice: A/C cooling & TPMS malfunction on my 2009 Scorpio

When I take the car above 120 for some time the AC vents stop giving out air.

BHPian yash_anand recently shared this with other enthusiasts.

I have 2 issues (which I feel are interconnected) with the my 2009 Scorpio VLX model.

  • This a strange issue - When I take the car above 120 for some time the AC vents stop giving out air. The AC is working as inside the vents are cold and the noise from the blower is ON. But cold air does not come into the cabin and in 5 min the whole cabin becomes hot.
  • The tyre sensors in the dashboard are always blinking. I attribute the same to a low voltage coming from the alternator. The low voltage was confirmed by one of the guys when he was trying to program a new remote lock for the car.

One of the local garages had tried rectifying the alternator but I guess this was before the observation in (2). So, either the job was not well done or something else.

The problem (1) is a bit irritating as I cannot drive beyond a certain speed limit. I was thinking of taking to a Mahindra service station but I wanted to be well-informed before getting into the mess of Mahindra service.

Any observations or reco(s) are welcome.

Here's what BHPian SS-Traveller had to say on the matter:

For problem #1, get an AC service centre to remove, wash and refit the cooling coil. The dashboard will need to be taken apart, and the gas will have to be recharged. A full day's job, so don't fret about it, or the expense. The cooling coil may need replacement if it fails a pressure test after cleaning.

For problem #2, have the TPMS sender (sensor) units in all wheels replaced. The batteries are running down (after 13 years that is expected), and are not replaceable, so the whole unit in each wheel needs replacement.

Here's what BHPian Kosfactor had to say on the matter:

AC work most of the times is done best at an AC specialist, I know of one - Aditya Car AC, they are very good at their work as I have experienced. Give it a try.

Alternator is fully serviceable however needs to be done at a competent place, else best to purchase a new one.

Here's what BHPian dhanushs had to say on the matter:

I think your evaporator coil is getting iced up. Just to check that it is the case, try switching off the compressor (AC Switch) and turning it on after a couple of minutes. Remember to keep the fan ON.

Once done, the ice should melt and you should get back the cold air.

In that case, what is wrong would be the AC Pressure Switch, dirty evaporator coil, or may be even low refrigerant in some cases.

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