Toyota Sequoia poor AC performance

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theherbster
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Joined: Wed Sep 05, 2018 10:12 pm

Toyota Sequoia poor AC performance

Postby theherbster » Wed Sep 05, 2018 10:29 pm

Hi guys,

Wondering if you could help me out please. Dual Ac Sequoia doesn't seem to cool very well - poor performance in hot weather. Compressor seems to run constantly, but that may be the high temps here in Texas?

When I had the timing belt done, the garage noticed the poor performance, 'checked' the systems and told me my compressor was 'on it's way out' and wanted $2700 to change the whole system. Needless to say I told them to stick to cars as their comedy act was terrible.
I had the system evac'd and put in 39 oz exactly, to make sure it wasn't the levels, but not a real improvement.

Pressures are: LOW 55 HIGH 260
Temp 86 degrees
Humidity was 68% at the time
Vacuum 45 mins, check no leaks for 20 mins

The car had been running at 1500 rpm for a couple of minutes. What do you think could be the problem? Thanks
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bohica2xo
Posts: 550
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Location: Las Vegas, NV

Re: Toyota Sequoia poor AC performance

Postby bohica2xo » Fri Sep 07, 2018 10:06 am

Condensing problem. Condenser fans , air path blocked etc.

Were those pressures taken at 1500 rpm? Both cabin fans on highest speed? Doors open?

What year is this Toyota?
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Cusser
Posts: 371
Joined: Sun Apr 24, 2016 6:29 am

Re: Toyota Sequoia poor AC performance

Postby Cusser » Fri Sep 07, 2018 11:34 am

Also check to make sure no heated air or outside air is getting mixed in.
theherbster
Posts: 2
Joined: Wed Sep 05, 2018 10:12 pm

Re: Toyota Sequoia poor AC performance

Postby theherbster » Sat Sep 08, 2018 6:16 am

2003 Toyota. Pressures at idle
Condenser fan kicks on fine with good airflow
Fans high speed with doors open
Hot goes hot and switches back to cold when I turn the temp.

Thanks for the replies so far.
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Cusser
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Joined: Sun Apr 24, 2016 6:29 am

Re: Toyota Sequoia poor AC performance

Postby Cusser » Sat Sep 08, 2018 6:22 am

Post pressures at 1500 - 2000 rpm.
JohnHere
Posts: 117
Joined: Sun May 13, 2018 10:20 am
Location: South Carolina Upstate

Re: Toyota Sequoia poor AC performance

Postby JohnHere » Wed Sep 12, 2018 10:59 am

I don't think it's the compressor, which seems to be putting out sufficient pressure. In fact, both high-side and low-side pressures are elevated. The pressure on the low side, 55 PSI, corresponds to evaporator temps in the high 50's. So I can see why you aren't getting enough cooling.

In addition to the suggestions already mentioned, it could also be a partially stuck-open TXV.

What vent temps are you seeing?

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