20 Most Recent 1999 Jeep Wrangler - Page 9 Questions & Answers

my horn quit working on my 99 wrangler...took it to a shop...the part they changed was called a clock switch...very expensive part but it fixed the problem...part was supposedly dealer only part...horn works great now

The intake manifold is the common culprit for this. It may look like it is flush to the block, but it isnt and is causing a huge vaccum leak. There are two locating dowel pins that the manifold must be flush on before tightning the bolts. The usual problem is that the manifold is resting on top of these pins instead of flush, causing a gap. You have to unbolt the intake and exhaust manifolds, relocate the intake and replace the bolts.

The best fix is to install the two piece OEM manifold from the later model (2000's) wranglers. There are also manifolds with accordian type flex joints for sale on line that will last MUCH longer than the one piece OEM manifolds.

There is no inertia switch on a 1999 Wrangler.

The key is the heater hoses. The top hose is the inlet for the heater core and the bottom is the return line. If the bottom hose is not hot, there is little flow through the heater core. It does not have to be completely clogged to reduce the heat output. The core needs to be flushed multiple times IN BOTH DIRECTIONS through the heater hoses. If this does not restore the heat, try a commercial/radiator flush. Many people have had alot of success by filling the core, through the heater hoses, with a CLR type product and letting it sit for 10-15 minutes to remove scale followed by a thorough flush.

The throttle position sensor on a Jeep Wrangler is not serviceable. It must be replaced if bad.

The fuel filter is in the gas tank attached to the fuel pump. The tank must be taken out of the vehicle to change the pump and/or filter.

The fuel filter on a 1999 Wrangler is an intergral part of the fuel pump and is a sock type filter. You must drop the fuel tank and remove the pump from the top to replace.

this problem could be a worn or loose wheel bearing or a worn or broken shock or a worn tie rod inner or outer.

you have a serious wiring problem. you will have to take that to dealer.

Remove the transmission & open it up to diagnose

Change the resistor but also check the fan to make sure it is not a bad fan motor.