[4th Gen : 01-07]: Multiple air/heater problems
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Multiple air/heater problems
My 02 Caravan has multiple problems with the air/heat.
1. Front fan doesn't work. I can hear it randomly try to work. Could this be a simple resistor fix or is it safe to say it's the blower motor?
2. The rear only gets cold air, no heat. I don't know if this would be caused by a leak or if something is not operating as it should. (what would it be and where do I find it)
3. I am burning coolant somewhere (see above possibly). I can smell it but don't see any leaks. Front floorboards are dry and no visible leaks on the ground.
1. Front fan doesn't work. I can hear it randomly try to work. Could this be a simple resistor fix or is it safe to say it's the blower motor?
2. The rear only gets cold air, no heat. I don't know if this would be caused by a leak or if something is not operating as it should. (what would it be and where do I find it)
3. I am burning coolant somewhere (see above possibly). I can smell it but don't see any leaks. Front floorboards are dry and no visible leaks on the ground.
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1. Smack the blower motor under the dash behind glove box. If it comes to life or dies you have a bad blower or loose connection. Nothing happens? Probably a bad resistor or controller depending on if you have auto temp control or not.
2 Feel the heater lines under the van passenger side rear. Are they at least warm? Probably a dead mode door actuator in the rear HVAC unit.
3. If you can't see it I would use a pressure tester to apply constant pressure with the engine off. If it doesn't hold pressure keep pumping pressure in till you see a puddle then trace it from there. Can sign them out on loan from parts stores. To verify you don't have an internal leak (bad head gasket) sign out a combustion tester.
2 Feel the heater lines under the van passenger side rear. Are they at least warm? Probably a dead mode door actuator in the rear HVAC unit.
3. If you can't see it I would use a pressure tester to apply constant pressure with the engine off. If it doesn't hold pressure keep pumping pressure in till you see a puddle then trace it from there. Can sign them out on loan from parts stores. To verify you don't have an internal leak (bad head gasket) sign out a combustion tester.
Last edited by Cougar41; Nov 11, 2015 at 05:41 PM.
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Thanks!
We did end up replacing the blower motor which got air flow back into the cabin but driver side was an ambient temp while the passenger side stayed cold. At that point we replaced the resistor and that didn't help.
What I'm seeing now is this...
Once van is at operating temp I get cold air when fan is on high. If I put the van on the lowest setting I get slightly warm air. If I turn off the heat, wait a few minutes then turn it back on I get a burst of warm out out of all the vents (front and back) but then it quickly changes to cold air. Could this be a faulty water pump? Blend door? heating core?
We also discovered that while my coolant reservoir was full (actually above max line) my radiator had very little coolant. Would the lack of coolant flowing into the radiator also cause the heat to not work?
We did end up replacing the blower motor which got air flow back into the cabin but driver side was an ambient temp while the passenger side stayed cold. At that point we replaced the resistor and that didn't help.
What I'm seeing now is this...
Once van is at operating temp I get cold air when fan is on high. If I put the van on the lowest setting I get slightly warm air. If I turn off the heat, wait a few minutes then turn it back on I get a burst of warm out out of all the vents (front and back) but then it quickly changes to cold air. Could this be a faulty water pump? Blend door? heating core?
We also discovered that while my coolant reservoir was full (actually above max line) my radiator had very little coolant. Would the lack of coolant flowing into the radiator also cause the heat to not work?