Question about Dodge Caravan
My 2003 Caravan with 3,8L engine doesn't reach operating temperature before a goof hour of driving. If I just drive to work in traffic, which takes roughly 40 minutes, it only reaches luckewarm temperature, indicated by the gauge and the heater temp. The only way I can get the temp to go up slightly is to turn off the heater, and only then, does the engine temp go up slightly. If I reach operating temperature, and then turn the heat on, the engine temp goes down. I have replaced the thermostat and checked for leaks but nothing changed.
No one ever said new means good. Try another thermostat. Make sure it is the recommended temp for the vehicle. I would spend the extra money to buy a dealer thermostat. What controls temp is restriction of flow thru the system until a set temperature is reached and the thermostat opens. Has to be a thermostat.
Posted on Dec 31, 2013
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Posted on Jan 02, 2017
try changing the thermostat if thats not it check and see if you have water leaking in the passenger side floor board if so then you need a new heater core
Posted on Feb 24, 2009
I suspect you are right with the thermostat angle.
The new thermostats are the opposite to the old ones that used to cook the motor when they failed.
The new ones run too cold in case of failure and also up the fuel consumption because the computer gives a cold motor more fuel than a hot one.
Posted on Oct 17, 2009
Testimonial: "thanks for the response, I will replace the thermostat and see if this solves the problem"
the dommed part of the T-stat goes up, it won't go in backwards as memory serves me, what u almost certainly have going on here is the Air temperature control electric bend door actuator s defective, and the door is stuck in the cold air position in the heating/ac duct, to replace this the dash must be removed from the car..
Posted on Nov 14, 2009
Tips for a great answer:
The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.
When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.
The engine coolant temperature sensor is also utilized for control of the cooling fan.
Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines
Check this test procedure:
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