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#1
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92 Caravan A/C & Radiator fan problems
Both fans & A/C clutch don't work. All will work when I put a 12 v source
to them, but won't work otherwise. I have checked the power past the fuseable link at the battery, and have power, but no power at the relays. I have a parts car and have change out the relays, but that didn't help. How do you check the relays for operation, and is there some other fuses or fusable links that I haven't found that I can check or replace. Any ideas would be appreciated. |
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#2
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"remlap" > wrote in message
lkaboutautos.com... > Both fans & A/C clutch don't work. All will work when I put a 12 v source > to them, but won't work otherwise. I have checked the power past the > fuseable link at the battery, and have power, but no power at the relays. > I have a parts car and have change out the relays, but that didn't help. > > How do you check the relays for operation, and is there some other fuses > or fusable links that I haven't found that I can check or replace. > > Any ideas would be appreciated. > > Sometimes the fusible link will partially fail so you still get 12V with no load but then the fans run slow or not at all. Check the voltage after the link while the load is on. This happened to me and it took a while for me to figure out... -- Scott Ehardt http://www.scehardt.com |
#3
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"remlap" > wrote in message
lkaboutautos.com... > Both fans & A/C clutch don't work. All will work when I put a 12 v source > to them, but won't work otherwise. I have checked the power past the > fuseable link at the battery, and have power, but no power at the relays. > I have a parts car and have change out the relays, but that didn't help. > > How do you check the relays for operation, and is there some other fuses > or fusable links that I haven't found that I can check or replace. > > Any ideas would be appreciated. > > Sometimes the fusible link will partially fail so you still get 12V with no load but then the fans run slow or not at all. Check the voltage after the link while the load is on. This happened to me and it took a while for me to figure out... -- Scott Ehardt http://www.scehardt.com |
#4
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This was my advice for another person with radiator cooling problem only.
There is also a sensor/switch for the a/c fan located in behind grill along with radiator sensor. a/c clutch activation is usually dependent on adequate freon pressure so you might check that first. This prevents compressor damage. Good luck 1. Thermostat was a good start and really does not matter where you purchase the item. If you really need to feel it works then test the activation point slowly boil a pot of water on the stove and hang a cooking thermometer on the side. Your real problem as described appears to be your radiator fan is not activating at the appropriate time. Check to see if it is working by warming up the engine and letting idle until it reaches normal or slightly higher temp. If the radiator fan does not activate above your normal reading or at all then check that the electrical connections are clean etc. You can also apply 12v directly to the fan motor leads (while car is off) to verify the fan motor is working. If connection and fan are ok then your likely problem is the electronic temperature sensor/switch for your radiator cooling fan or the relay that supports it. Relay is part of a three/four relay group mounted to the inside of driver front fender (next to battery) It should click everytime the fan turns on/off. If the relay is fine then replace electronic temperature sensor/switch for your radiator cooling fan. It is behind your grill and is usually mounted to the center brace. It measures both the incoming air and the radiant temp of the radiator and turns the fan on (using the relay) as needed. The sensor/switch fails over time or can break loose from its mount (plastic tab used) and is simple to change. Relay is std part you can get anywhere. Sensor is a dealer only part, remove the old one and take it to the dealer so they can order the part. "Scott Ehardt" > wrote in message news > "remlap" > wrote in message > lkaboutautos.com... > > Both fans & A/C clutch don't work. All will work when I put a 12 v source > > to them, but won't work otherwise. I have checked the power past the > > fuseable link at the battery, and have power, but no power at the relays. > > I have a parts car and have change out the relays, but that didn't help. > > > > How do you check the relays for operation, and is there some other fuses > > or fusable links that I haven't found that I can check or replace. > > > > Any ideas would be appreciated. > > > > > > Sometimes the fusible link will partially fail so you still get 12V with no > load but then the fans run slow or not at all. Check the voltage after the > link while the load is on. This happened to me and it took a while for me > to figure out... > > -- > Scott Ehardt > http://www.scehardt.com > > |
#5
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This was my advice for another person with radiator cooling problem only.
There is also a sensor/switch for the a/c fan located in behind grill along with radiator sensor. a/c clutch activation is usually dependent on adequate freon pressure so you might check that first. This prevents compressor damage. Good luck 1. Thermostat was a good start and really does not matter where you purchase the item. If you really need to feel it works then test the activation point slowly boil a pot of water on the stove and hang a cooking thermometer on the side. Your real problem as described appears to be your radiator fan is not activating at the appropriate time. Check to see if it is working by warming up the engine and letting idle until it reaches normal or slightly higher temp. If the radiator fan does not activate above your normal reading or at all then check that the electrical connections are clean etc. You can also apply 12v directly to the fan motor leads (while car is off) to verify the fan motor is working. If connection and fan are ok then your likely problem is the electronic temperature sensor/switch for your radiator cooling fan or the relay that supports it. Relay is part of a three/four relay group mounted to the inside of driver front fender (next to battery) It should click everytime the fan turns on/off. If the relay is fine then replace electronic temperature sensor/switch for your radiator cooling fan. It is behind your grill and is usually mounted to the center brace. It measures both the incoming air and the radiant temp of the radiator and turns the fan on (using the relay) as needed. The sensor/switch fails over time or can break loose from its mount (plastic tab used) and is simple to change. Relay is std part you can get anywhere. Sensor is a dealer only part, remove the old one and take it to the dealer so they can order the part. "Scott Ehardt" > wrote in message news > "remlap" > wrote in message > lkaboutautos.com... > > Both fans & A/C clutch don't work. All will work when I put a 12 v source > > to them, but won't work otherwise. I have checked the power past the > > fuseable link at the battery, and have power, but no power at the relays. > > I have a parts car and have change out the relays, but that didn't help. > > > > How do you check the relays for operation, and is there some other fuses > > or fusable links that I haven't found that I can check or replace. > > > > Any ideas would be appreciated. > > > > > > Sometimes the fusible link will partially fail so you still get 12V with no > load but then the fans run slow or not at all. Check the voltage after the > link while the load is on. This happened to me and it took a while for me > to figure out... > > -- > Scott Ehardt > http://www.scehardt.com > > |
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