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1990 Dodge Ram Van B350 Problems

 

HVAC Air Flow Switching to Defrost When Accelerating

Verified for the Dodge Ram Van B350

The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops.  There is also a revised vacuum check valve available to address this concern.

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Erratic Blower Motor Operation Due to Overheated Switch

Verified for the Dodge Ram Van B350

The blower motor may operate erratically and the blower switch operation has a sticky or mushy feeling, the detents almost non existent. Our technicians tell us that the blower switch should be removed and inspected for overheating. This is common if the blower motor is frequently operated on high speed as the current flow through the switch tends to melt internal the components. Also carefully inspect all of the switch connector terminals for discoloration due to overheating and replace as required. A poor electrical contact at the connector will also cause the switch to overheat.

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Door Glass May Separate From Lift Channel

Verified for the Dodge Ram Van B350

The door glass may separate from the glass lift channel. Our technicians tell us a front door glass channel kit is available to repair the door glass. The repair involves removing the door glass from the vehicle.

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High Blower Only Due to Failed Blower Motor Resistor

Verified for the Dodge Ram Van B350

The HVAC blower may operate on high speed only. This is commonly caused by a failed blower motor resistor. Chrysler has released a revised part to address this problem.

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Distributor pickup plate may fail

Verified for the Dodge Ram Van B350
The distributor pickup plate may fail causing Intermittent Stalling or No Start Condition, usually when engine is hot. 
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Failed transmission due to a restricted cooler

Verified for the Dodge Ram Van B350
Automatic Transmission
A clogged or restricted transmission fluid cooler system can be the cause of reoccurring transmission failures. Our technicians tell us that if your transmission has failed due to lack of lubrication the transmission fluid cooler and lines should be thoroughly inspected for restrictions.
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HVAC blower motor fuse may blow

Verified for the Dodge Ram Van B350
The fuse may blow repeatedly for the HVAC blower motor or the motor may stop working all together. Our technicians tell us that can often be repaired by replacing the blower motor switch with a revised switch and installing a wiring harness with a relay assembly.
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Fuel injector or O-ring seal may leak fuel

Verified for the Dodge Ram Van B350
Hard Starting, Rough Idle, Black Exhaust Smoke, Poor fuel mileage may indicate a leaking injector or more commonly a leaking injector O-ring. Our technicians tell us that with engine idling and air cleaner removed, look into the throttle body with a flashlight, If fuel is seen dripping from around the injector, the O-ring is likely faulty. If fuel is dripping from the injector nozzle, replace the injector.
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Carbon buildup at top of piston may cause noise

Verified for the Dodge Ram Van B350

One the 3.9L V6 and 5.9L V8 the carbon buildup on the top of the piston is common. As the buildup increases with mileage and over time, symptoms may vary from light ticking, to ticking/hammering, to hammering/knocking noises. Fuel injector cleaner often solves the problem.

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Oil leaks from valve cover, intake manifold, and timing cover gaskets

Verified for the Dodge Ram Van B350

On the 3.9L V6, 5.2L V8 and 5.9L V8 the Oil leaks commonly from the valve cover gaskets, intake manifold gaskets (front and rear), timing cover gaskets, distributor O-ring, and the rear main seal area. Using fluorescent engine oil dye can be helpful in determining the source(s) of the oil leak.

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