Thermostats
Dodge Ram Van

How do you change the thermostat on a 1999 Dodge Van 5.9 liter?

Answer

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Wiki User
07/30/2007

Follow the upper radiator hose to the engine block. Then remove the housing to access the thermostat. You may have to remove the fan housing to gain enough access to the therm housing. Make certain to get the right temp thermostat(185) and install exactly as removed. Use a good gasket sealer. It's a PITA. (PAIN IN THE ASS!) You have to remove the upper alternator bolt to slide the alt to the left. Depending on the location and style of clamp used ,you may have to remove the air compressor. ONLY REMOVE THE FOUR BLOTS OF THE COMPRESSOR AND NOT THE LINES. Remove the 2 bolts for the thermostat. It is a good idea to relace the little bypass hose while you are replacing the thermostat. You will need to reomve the compressor/alt bracket to do this . If you have gotten this far it is well worth it. A good DYI'er can do this job in approx 1-1 1/2hrs. Better than a few hundred at dealer.