Question about Ford E-350 Super Duty
Heater core gets warm, fan can be heard blowing strong all speeds, 2 doors open and close when switching from AC to heat. One door goes out firewall to where blower is the other door is behind heater core. There is no cabin filter in this model to get blocked. I get only slightly luke warm air at very low output no matter what the fan speed is. Any ideas?
Not completely sure what symptoms are but you may have a partially plugged heater core. A reverse flush through the heater core may do the trick. There will be two hoses going to the heater core, one in and one out. Sometimes these heater cores are easy to replace, sometimes it's a major job. I am not familiar with the e350. There is a danger of creating a leak in a reverse flush if rust or whatever is sealing a leak.
Posted on Jan 15, 2013
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Posted on Jan 02, 2017
replace the blower motor resistor. It controls the fan speeds. It defaults to high speed only when it fails.
How to replace the blower motor resistor block: Caution: Stay clear of the blower motor and resistor block (Hot). Do not operate the blower motor with the resistor block removed. 1. Disconnect and isolate the battery negative cable.
2. Remove the glove box from the instrument panel.
3. Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch.
4. Depress the latch on the blower motor resistor wire harness connector and disconnect the connector from the resistor.
5. Remove the two screws that secure the blower motor resistor block to the HVAC housing.
6. Remove the resistor block from the HVAC housing. Installation:
1. Position the blower motor resistor block into the HVAC housing.
2. Install the two screws that secure the resistor block to the HVAC housing. Tighten the screws to 2.2 Nm (20 in. lbs.)
3. Connect the wire harness connector to the resistor block.
4. Push in the lock on the blower motor resistor wire harness connecgtor to lock the connector latch.
5. Install the glove box.
6. Reconnect the battery negative cable.
7. Have a nice day!
Posted on Oct 11, 2010
I have the same issue and my problem is not the blower, it works but the plug into is the problem and that small part is not sold seperately. I wedged it for a time but now that is not working. Anyone else having the issue or replaced that part?
Posted on Oct 18, 2010
SOURCE: heater only blows Very luke
Read all of these instructions before starting this job.
First test your heater core for flow by disconnecting both heater core hoses from motor and forcing air from an air compressor into one of them watching for flow from the other. If you have no flow then you may need to backflush your heater core - it is possible you have blockage in it. Your local auto parts store has a backflush kit you can buy that will have a backflush valve ( to be added to your supply heater core hose ) and an additive to put in your coolant system. The kit will not include new coolant so you will need to get that too. Install valve and connect a garden hose.Run motor specified time in the kit. Remove lower hose from your radiator and turn on the water from the hose full blast. Watch the coolant coming out from your radiator to see if any chunky stuff comes out - also watch for the color of the flow. Run water until it comes out clear, then shut off water and disconnect garden hose. Allow system to drain, reconnect radiator hose and cap flush valve. Refill coolant system, turn heat on high and run motor until it is warm. Top off coolant in radiator ( be careful - the pressure may cause coolant to spray out when you remove cap - put a rag over the cap before you remove slowly). If you do not have warm air at this point you may have a bubble in the heater core and may need to block rear wheels then raise the front of the vehicle until the radiator cap is higher than the heater core. Restart vehicle and turn heater on high . Check coolant level in radiator and top off, then cap radiator and shut off motor. Lower vehicle and start again with heater on high. If you still have no heat then your heater core may be plugged. To check, remove both heater hoses from motor and force air from an air compressor into one of the hoses, watching for flow from the other hose - if no flow then core is plugged and needs to be replaced, but if you have flow then you still have an air bubble in the system and need to purge using the above steps until you have heat.
Hope this helps and please rate my solution - good luck!!
Posted on Nov 29, 2010
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