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Try heater hoses.
Could be a failed engine coolant temperature sensor. Easy enough to replace and not too expensive.
probably the sensor
coolant temp sensor not working
Check the temp sensor. The control is not turning on the fan when engine temp requires it, so the most common cause is the sensor.
Temp. sensor my have stopped working. Quick and fairly easy fix.
Yes
under intake manifold pass side
Replacing the actual part is not always going to fix a problem. The cooling temperature sensor may stop working if the wiring, to and from it is burnt out, and if the fuse is broken.
The coolant temp sensor screws into the side of the engine. It is located just below the connectors for the heater hoses.
1. low coolant 2. heater pump (below top radiator hose) should be buzzing while heater is on. 3. heater control valve (below heater pump) 4. in car temp sensor (above ign. key) try spraying air into grill intake to clean it 5. bring to jag expert
Is it full of antifreeze? Does the engine come up to temperature? Does it sound/feel like the temp control is moving anything?