Joined
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416 Posts
Car: 1995 Supra
Symptoms: A/C blows cold, but not all the time. Sometimes it will run for an hour without a problem and will easily pull the interior temp down to 65 deg F on a 80 deg F day. Other times it will just start blowing hot air. If you look under the hood during the failure, the compressor is still engaged, but no cold air.
The A/C system diagnostics (as specified in the 95 TSRM) show no error codes stored at all.
Using a gauge on the low pressure port shows pressure in the 35 - 40 psi range when the system is running and blowing cold air. Temp gauge inserted into the center console vent shows air at 58 deg F with ambient in the 85 deg F range.
When the failure occurs the pressure gauge on the low side port drops to 0 psi, even when the compressor is running.
System contaminated? Moisture in the refrigerant freezing in the evaporator?
Any ideas?
Most cars I would just take to an A/C shop, but the thought of leaving a Supra with those guys gives me the willies...
Symptoms: A/C blows cold, but not all the time. Sometimes it will run for an hour without a problem and will easily pull the interior temp down to 65 deg F on a 80 deg F day. Other times it will just start blowing hot air. If you look under the hood during the failure, the compressor is still engaged, but no cold air.
The A/C system diagnostics (as specified in the 95 TSRM) show no error codes stored at all.
Using a gauge on the low pressure port shows pressure in the 35 - 40 psi range when the system is running and blowing cold air. Temp gauge inserted into the center console vent shows air at 58 deg F with ambient in the 85 deg F range.
When the failure occurs the pressure gauge on the low side port drops to 0 psi, even when the compressor is running.
System contaminated? Moisture in the refrigerant freezing in the evaporator?
Any ideas?
Most cars I would just take to an A/C shop, but the thought of leaving a Supra with those guys gives me the willies...