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.

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.

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 a 98.5 24 valve is the firing order 153624 and if so which is number 1 2 3 4 5 6 on the block

The following have been replaced: thermostat, clutch fan, radiator cap, water pump (wasn't running hot until clutch fan was replaced and radiator flush was done) We were told the clutch fan wa...

Can someone let me know what specific brand/part to buy as there are so many online. My father-in-law asked me to buy: a water pump, fan belt, and belt tensioner. Thanks.