QuestionI have a 2001 Dodge Durango with a 4.7L engine. The thermostat had to be replaced. After replacing the thermostat, re-attaching the housing, now coolant will not stop leaking. Why is the coolant leaking and how do I fix the problem?
AnswerHi Stacy,
You could get a better view by removing the 'spash shield' nearby to where you are working. That is the panel between the wheel well and the engine compartment. So remove the wheel, then there are three screws that hold it to the fender and 5 'inner screws, and one electrical connector push-pin to remove. Remove the splash shield and you can see what I describe below.
The manual points out that the new thernostat has to be like the old one (e.g. the correct part) and the spring side has to go in first. but before inserting the thermostat, the mating surfaces of the housing and the timing chain cover need to be cleaned to be sure of no dirt/stray material between them. The thermostat must be centered in the machined groove provided for it in the timing chain cover, and the thermostat housing has to be installed properly with the thermostat still positioned in that machined groove. Finally the securing bolts have to be tightened to 9 foot-pounds, gradually and very evenly. If any of those steps are not accomplished there can be a leak, or worse, damage to the timing chain cover or the thermostat housing. No mention is given of a gasket so apparently there is not one, so you have to be sure the mating surfaces are clean before assembly.
That is from the factory manual. Also, check that the leak is not due to a loose/cracked radiator hose where it attaches to the thermostat housing.
I hope this helps you solve the leak.
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Thanks,
Roland
