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SVTPerformance's Chain of Restaurants
Road Side Pub
F250 AC fuse question
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<blockquote data-quote="Vinnie_B" data-source="post: 16870522" data-attributes="member: 201678"><p><strong>A/C Request</strong></p><p><strong></strong></p><p><strong><em>** <span style="font-size: 15px">When the customer directly inputs an A/C request into the HVAC control module, the module sends the request to the GWM over the MS-CAN . The GWM sends the request to the PCM over the HS-CAN1 .</span></em></strong></p><p></p><p><span style="color: rgb(184, 49, 47)">** When an A/C request is received by the PCM , the A/C clutch relay is engaged when all of the following conditions are met:</span></p><p></p><ul> <li data-xf-list-type="ul">Excessively high or low refrigerant pressure from the A/C pressure transducer is not detected.</li> <li data-xf-list-type="ul"><span style="color: rgb(184, 49, 47)">Ambient air temperature is above approximately 32.0°F (°C).</span></li> <li data-xf-list-type="ul">Engine coolant temperature conditions are within normal parameters.</li> <li data-xf-list-type="ul">Evaporator temperature is above approximately 33.8°F (1°C).</li> <li data-xf-list-type="ul">a Wide Open Throttle (WOT) condition is not present.</li> <li data-xf-list-type="ul">Battery state of charge conditions are within normal parameters.</li> <li data-xf-list-type="ul">the PCM does not detect temperatures from the Mass Airflow/Intake Air Temperature sensor that does not correlate with other temperature sensor readings at ignition ON. (Most Mass Airflow (MAF) sensors have an integrated Intake Air Temperature (IAT) sensor).</li> </ul><p>Compressor control and the evaporator temperature are a function of many parameters, not just a straight on/off, to avoid freezing the evaporator. The PCM monitors multiple temperature sensors for correlation including, but not limited to, AAT, CACT, CHT, ECT, IAT, IAT2, MAF, MAPT, TCB and TCIPT Parameter Identifications (PIDs) (as applicable). The PCM runs this logic after an engine off and a calibrated soak period of 6 to 8 hours. This soak period allows the Ambient Air Temperature (AAT) sensor and the other temperature sensors to stabilize and not differ by greater than a calibrated value, typically 18ºC (32.4ºF). <span style="color: rgb(184, 49, 47)">If a temperature sensor input is found to be reporting a temperature imbalance the PCM does not allow the A/C clutch to engage. </span></p><p></p><p></p><p>Lightning Fast<img class="smilie smilie--emoji" loading="lazy" alt="⚡" title="High voltage :zap:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/26a1.png" data-shortname=":zap:" />Electrical Automotive Repair LLC</p><p>PM Me or <a href="mailto:Lightning_Fast@comcast.net">Lightning_Fast@comcast.net</a></p><p>Website: <a href="https://www.lightningfastelectricalautorepair.com/" target="_blank">Lightning Fast Electrical Automotive Repair LLC</a></p><p>Remote or Local (On Site) Technical Repair</p></blockquote><p></p>
[QUOTE="Vinnie_B, post: 16870522, member: 201678"] [B]A/C Request [I]** [SIZE=4]When the customer directly inputs an A/C request into the HVAC control module, the module sends the request to the GWM over the MS-CAN . The GWM sends the request to the PCM over the HS-CAN1 .[/SIZE][/I][/B] [COLOR=rgb(184, 49, 47)]** When an A/C request is received by the PCM , the A/C clutch relay is engaged when all of the following conditions are met:[/COLOR] [LIST] [*]Excessively high or low refrigerant pressure from the A/C pressure transducer is not detected. [*][COLOR=rgb(184, 49, 47)]Ambient air temperature is above approximately 32.0°F (°C).[/COLOR] [*]Engine coolant temperature conditions are within normal parameters. [*]Evaporator temperature is above approximately 33.8°F (1°C). [*]a Wide Open Throttle (WOT) condition is not present. [*]Battery state of charge conditions are within normal parameters. [*]the PCM does not detect temperatures from the Mass Airflow/Intake Air Temperature sensor that does not correlate with other temperature sensor readings at ignition ON. (Most Mass Airflow (MAF) sensors have an integrated Intake Air Temperature (IAT) sensor). [/LIST] Compressor control and the evaporator temperature are a function of many parameters, not just a straight on/off, to avoid freezing the evaporator. The PCM monitors multiple temperature sensors for correlation including, but not limited to, AAT, CACT, CHT, ECT, IAT, IAT2, MAF, MAPT, TCB and TCIPT Parameter Identifications (PIDs) (as applicable). The PCM runs this logic after an engine off and a calibrated soak period of 6 to 8 hours. This soak period allows the Ambient Air Temperature (AAT) sensor and the other temperature sensors to stabilize and not differ by greater than a calibrated value, typically 18ºC (32.4ºF). [COLOR=rgb(184, 49, 47)]If a temperature sensor input is found to be reporting a temperature imbalance the PCM does not allow the A/C clutch to engage. [/COLOR] Lightning Fast⚡Electrical Automotive Repair LLC PM Me or [EMAIL]Lightning_Fast@comcast.net[/EMAIL] Website: [URL='https://www.lightningfastelectricalautorepair.com/']Lightning Fast Electrical Automotive Repair LLC[/URL] Remote or Local (On Site) Technical Repair [/QUOTE]
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F250 AC fuse question
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