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New
1984-2/92 Ford Bronco
1984-2/92 Ford F150, F250, F350
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New Ford # E4TZ-2A451-A
What does this part do?
This vacuum pump operates the heater controls and four wheel drive front vacuum hubs on your Ford Diesel truck.
What happens when it fails?
Your heater defaults to defrost only, and your four wheel drive may not engage if the pump does not run at all. The pump may also fail and run continuously - in this case, there may be a leak in the system which the vacuum pump can not keep up with, so it runs all the time. Disconnect the outlet hose and plug the connection on the pump with your finger. If the pump stops running there is a leak in the system - probably a broken line, etc. If the pump does not stop running when you perform this test, it is bad and needs replacement.
Yes! Anybody with a few simple tools can do it! As easy as changing oil! The pump is located on the passenger's side inner fender between the battery and the blower motor. It is easy to get to. Just unbolt it, carefully dismount the old pump from the rubber "feet" and mount the new pump. Remove the original electrical connector, and install the two provided electrical spade connectors in their place. The black wire goes to the connection marked with a negative symbol on the pump. Apply a little grease to the terminals to prevent corrosion.
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