Mercury Grand Marquis cracked intake manifold issue persisting for nearly 2 years on Mercury Grand Marquis

Some Mercury Grand Marquis owners report experiencing issues with cracked intake manifolds, particularly in models from 1996 to 2001, which are made entirely of plastic. These problems can lead to engine overheating and coolant leaks, even under normal driving conditions. Owners often notice the check engine light and low coolant warning light activating due to a factory defect that causes cracking in the front coolant passage of the intake manifold. Additionally, some owners have found that aftermarket replacements, such as the Dorman intake manifold, may also be susceptible to cracking. It is crucial for Grand Marquis owners to stay vigilant and conduct regular maintenance and inspections to mitigate the risks associated with this persistent issue.