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 1999 Dodge Ram Van 1500
1999 Dodge Ram Van 1500
1999 Dodge Ram Van 1500 Problems
On 3.9L V6 and 5.9L V8 engines, the intake manifold gasket may leak and cause increased oil consumption and a spark knock during acceleration; the gasket should be replaced.
Some vehicles may exhibit one or more of the following: Spark knock complaints when the vehicle is under load, various single cylinder misfire, and surge in 4th gear (around 45 mph). Our technicians tell us that rerouting the coil and spark plug wires to minimize induction effects will commonly correct this condition. If wires must cross during the reroute procedure, they must cross at a 90 degree angle.
Leak detection pump failure can be caused by the internal diaphragm switch sticking, or in some cases, contamination from debris or carbon particles from vapor canister. If black carbon particles are present in the LDP, replace vapor canister in addition to LDP. The purge solenoid should also be checked for debris or carbon contamination and replaced as necessary. All evap system hoses are subject to cracking and splitting causing leaks, Inspe...
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.
1999 Dodge Ram Van 1500 Questions and Answers
The van is making a single, dull, heavy, ‘thud’ or ‘clunk’ like sound. There does not seem to be any pattern or repeating causitive condition associated with the noise. The sound may occur when the...
I understand that there are many components that may need to be replaced;
Please Advise. Thank You.
Where is the CamShaft Positioning sensor located on my 1999 doge mach 3 conversion van? If this was bad would the check engine light come on? Cause mine is not. I have fuel and spark but will not f...
need a layout of vac lines for heater and air had engine replaced with rebuilt and air and heat have not work right since. need where they come from and go to.
1999 Dodge Ram Van 1500 Reviews
my van is one of the best vehicles i own up untill now i have had very little problem's with it, just needs a little work done to it engine wise, body wise it is in almost show room quality, i think it is remakable it has lasted in this condition for over 128,000 miles i'am very pleased with it and gas mileage is pretty good nearly 20 mpg's (4.10) gears help alot.