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Why would heat turn to cold when you slow down on a 2002 Nissan sentra?
Wiki User
∙ 11y ago
Check the radiator coolant level! When it is low, and RPMs decrease at low speeds or idle, the coolant isn't being circulated through the entire cooling system, such as the heater core! Be sure the engine is cool before opening the radiator cap and adding coolant! NEVER add coolant to a hot engine because it will crack the block or cause the head gasket to blow!
Wiki User
∙ 11y ago
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What may cause a 2002 Nissan sentra 1.8L to blow cold air and overheat when the thermostat has been replaced?
Sorry to say, and I know it doesn't make much sense, but you most likely have a blown headgasket. I'm in the midst of replacing the headgasket myself on my 2002 Sentra. Not sure why, but it seems this is not an uncommon issue with these cars. Exhaust gas is getting into the coolant galleys within the head, which creates an airbubble of sorts that creates the overheating problem. Don't drive it around too much or you risk warping the head. Take it to a mechanic. I thought it was a thermostat myself, hoping against hope. The cold air from the heater is a result of poor coolant circulation through the heater core due to the void created by the rupture in the headgasket.
