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Not so sure what to call the thread but it is about as simple as it gets. A year or more ago I bought a 1996 f350 2wd dually crew cab long box. It was left in a field for a number of years taken apart. I was foolish enough to see it as a diamond in the rough. Actually I was after a solid cab that wasn't molested. This one has the correct paint code and is an xlt. It followed me home at midnight.
I took it for a test drive around town and it was alright, once on the highway though the tcase blew up. I took it apart and it looks as the the hose broke off the pump causing the front bearings to go dry. Its probably rebuildable but 1356 are cheap second hand.
The truck is back together now and driving. The only change has been a sudden loss of speedometer reading miles per hour but still counting miles gone by.
I still need to figure out why the heater doesn't blow warm air. Even after running for an hour. I have replaced the thermostat with a known good one. The heater core has been replaced as well. The temp gauge barely moves off C. I am not sure where to go with this diagnosis either replace the water pump or re route the heater hoses to match the 1997 (this eliminates a T fitting)
Are any of the coolant hoses warming up? An hour of driving should get the engine hot, and all the hoses- radiator and heater- should be hot to the touch. You might have a squirrely temperature sensor or gage. If both heater hoses are hot, the coolant is heating up and running through the core. Next step would be to check that the blend door is closing fully. My "no heat" when I bought mine was a pen that fell down the defroster vents and jammed the blend door. You could have a physical jam, the actuator tab on the door could have broken off, actuator not working, control lever not working.
But do check the hoses to see what is hot and what is not. That should narrow down the possibilities.
Are any of the coolant hoses warming up? An hour of driving should get the engine hot, and all the hoses- radiator and heater- should be hot to the touch. You might have a squirrely temperature sensor or gage. If both heater hoses are hot, the coolant is heating up and running through the core. Next step would be to check that the blend door is closing fully. My "no heat" when I bought mine was a pen that fell down the defroster vents and jammed the blend door. You could have a physical jam, the actuator tab on the door could have broken off, actuator not working, control lever not working.
But do check the hoses to see what is hot and what is not. That should narrow down the possibilities.
When I replaced the heater core I vacuumed a lot of stuff out of the heater core box. As for the blend door I will have to look closer at that. The sensor could well be faulty. As for the heater hoses and radiator hoses I will run it for an hour or so and check it out.
I had a 4.9 truck with a similar issue i replaced everything then decided to pull the pump. Turns out the impeller was mangled from coolant freezing. (It gets cold here) once the pump was replaced it was good.
The water pump on the 7.3 has the bolt on neck that turns down vs the cast pump. I am it sure if this pump takes a different thermostat but I replaced it with a known good one and no change to the temp gauge on the dash
@paddler I had it out yesterday and sure enough it gets warm under the hood. So I checked the temp sensor connector and move it up and down a bit on the threaded post. Viola! Gauge works.
I noticed a vacuum leak in the hvac switch when in the off position. My next step is to check the blend door and vacuum lines. I am considering heat shrink tube over the vacuum lines to reseal them just because that is what I have.
Now I need to figure out why the speedometer quite reading. (Odometer rolls over) I need to pull the driver and passenger side kicks and check the grounds for the dash. If they are good I will.have to take the cluster out and check the ribbon cable. Last weekend I put in a new axle sensor.
I hope to get this all sorted and then part my 97 'the big fix' and sell the 1995 351 crewcab. Or sumthin not sure how it will work out but 3 crewcab trucks in my suburban driveway is too much.
Look’n good, did you get your speedometer working. In the past I have had the VSS (vehicle speed sensor) on the rear axle go bad and have that symptom.
Look’n good, did you get your speedometer working. In the past I have had the VSS (vehicle speed sensor) on the rear axle go bad and have that symptom.
The odometer was still reading so I figured it must be a connection on the cluster. I pulled the cluster cleaned everything and put a little dielectric grease on the connections and reassembled. With the rear end in the air the speedo seems to be working.
I found the white plastic vacuum line broken and repaired it. Not sure if I will have heat yet. Hopefully though.
The heater problem seems to have bee. Related to a failed white vacuum line under the hood and a the actuator some times working and mostly not. I am not sure if there are other failure points in the HVAC system.
Today I am hoping to get it to a friends shop to pull vacuum on the AC system and charge it.
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