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.
Resources for the Repair and Maintenance of your 1990 Dodge Ram Van B150
1990 Dodge Ram Van B150
1990 Dodge Ram Van B150 Problems
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 conne...
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.
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.
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.
1990 Dodge Ram Van B150 Questions and Answers
location of voltage regulator
when driving down the road van vibrates more so at 40mph stops when i let off the gas did a tune up might have put wires in wrong order ujoints seem to be good can u send a wiring diagram on plug w...
when driving down the road i get a bad vibration especially at 45mph when i let off gas it quits ujoints seem to be good just did a tune up can u email me a wiring diagram for the van plz
On the bottom of the radiator are two nipples to which hose connects to keep transmission cool. purchased used radiator but it did not have the nipples to whic I would need to connect the lines. ...