99 Toyota Solara a/c pressure interpretation for diagnosis

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99 Toyota Solara a/c pressure interpretation for diagnosis

Postby chasr212r » Wed Feb 27, 2008 5:11 pm

Hello everyone. This is my first post and I need some help trying to determine the course of action to fix the a/c on a 99 Toyota Solara V-6. The system blows warm air, 70* with a full charge. The ambient temp here is 68*.

The compressor comes on and my guage readings are 15-20" of vacuum on the low side and 100psi on the high side at 1500 rpm's. I'm not sure how to interpret these readings and would like to know if there is a specific failure or could there be more than one possible cause? I do some a/c work, but sometimes I get a bit concerned that I may mis diagnose a problem like this. I also noticed that the guage readings do not equalize after turning the car off and letting it sit for 15 minutes.

Any input would be greatly appreciated. Thank You
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99 Solara

Postby Nacho » Wed Feb 27, 2008 6:12 pm

Your readings indicate that the system is low in refrigerant. Common leak areas in many Japanesse designs are both suction and discharge hoses. Oily appearance is an evidence.
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99 Solara update

Postby chasr212r » Wed Feb 27, 2008 7:22 pm

I evacuated & recharged the system on the 99 Toyota Solara 1lb 10 oz R134a. Rechecked the pressures and have 2psi (two psi) on the low side and 170psi on the high side and a duct temp of 65* Any suggestions? Thanks
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99 Solara

Postby Nacho » Wed Feb 27, 2008 8:04 pm

OK. If the charge is complete and with those readings (vacuum or abnormally low suction pressure), the problem is a defective expansion valve. I suggest replacing the drier as well
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99 Toyota Solara

Postby chasr212r » Wed Feb 27, 2008 8:14 pm

Thank you for the quick responses. I will be waiting at least a month before I replace the expansion valve & drier . I'll leave an update after the job is done.
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Postby Warren Willingham » Thu Feb 28, 2008 7:00 pm

I agree with Nacho. I would start at the liquid line (condenser outlet) and look for any cold spots going back to the drier then the TXV. It could be a block in a line, the drier could be plugged but most likely, it is the expansion valve as Nacho said.
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Re: 99 Toyota Solara a/c pressure interpretation for diagnosis

Postby chasr212r » Thu Feb 28, 2008 9:20 pm

Thanks Warren, The more info I have the better. I'll post the results in about a month +/_
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Re: 99 Toyota Solara a/c pressure interpretation for diagnosis

Postby Tom Greenleaf » Thu Feb 28, 2008 10:30 pm

Just a question for chasr212r...........

Just where are you in Mass that has an ambient temp of 68F? If you are testing indoors with a vehicle that's just been outdoors it's near impossible to get accurate pressures for quite a while till the whole vehicle warms up.

I've done it but still wasn't sure about performance at the usual Winter temps for here,

T
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Re: 99 Toyota Solara a/c pressure interpretation for diagnosis

Postby chasr212r » Fri Feb 29, 2008 1:02 am

The car is in a garage with a stable indoor temp of 68*.. The car had been in the garage for two days prior to the testing . Thanks for the additional info.
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