Question about Dodge Caravan

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Caravan does't reach operating temperature

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.

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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

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SOURCE: CAr Stalls engine temperature warning light turns on

Next step is thermostat

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SOURCE: Thermostat problem? 99 GMC savanna cargo 2500 5.0 liter

jt\\it could be the water pump or the thermostat giving you problems

Posted on Jan 22, 2009

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SOURCE: 2002 Lincoln Navigator. Heater is

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

  • 125 Answers

SOURCE: why does my engine not reach normal operating

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"

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SOURCE: replaced thermostat,heater core and still no heat

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

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I would suspect the thermostat first.

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Hi there:
The engine coolant temperature sensor is a variable resistor with a range of -40 degrees F-265 degrees F (-5 degrees C-129 degrees C).

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:

  1. Turn the ignition switch to the OFF position.
  2. Detach the coolant temperature sensor electrical connector.
  3. Using a DVOM set to the ohms scale, connect one lead to terminal A and the other lead to terminal B of the coolant temperature sensor connector.
  1. With the engine at normal operating temperature, approximaterly 200 degrees F (93 degrees C), the ohmmeter should read approximately 700-1000 ohms.
  2. With the engine at room temperature, approximately 70 degrees F (21 degrees C), the ohmmeter should read approximately 7000-13,000 ohms.
  3. If not within specifications, replace the engine coolant temperature sensor.
  4. Test the resistance of the wiring harness between PCM terminal 26 and the sensor wiring harness connector. Also check for continuity between PCM connector terminal 43 and the sensor wiring harness connector. If the resistance measures greater than 1 ohm, repair the wiring harness as necessary.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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I need the drive cycle for a 2002 Toyota corolla?

About a half hour of freeway driving should do. You just want the computer working in closed loop operation for awhile, long enough to have everything working, all gear shifting gone through, and the engine running for a bit at normal operating temperature. If that doesn't work, try two or three shorter drive cycles. As long as the engine is warmed up, the computer is in closed loop operation (using the sensors to perform engine management), that is basically one drive cycle Hope this helps you.

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In order to set the monitor it the drive cycle 2 trip criteria that means you need to have a cold start up and reach operating temperature then another cold start up with a operating temperature reached and the drive for each one is part throttle hold for 2 miles and a decelration for the catalytic to get ready.when the cat is ready the evap runs.If you are loosing monitor at key off and everything reset you can see the referee let them smog it. The EGR and EVAP are almost impossilbe to get ready

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Heater donot get hot whil running

It could be a plugged heater core or heater control problem. I assume the blower is working, but the air is cold. The first thing to check is the coolant level, make sure there is coolant in the resivoir. Next see if the temerature gauge reaches the normal operating temperature range. If the gauge reads cold most of the time, it would tell you that the thermsotat is faulty and not allowing the engine to reach full operating temperature. If your car doesn't have a temp gauge, the blue cold engine light might stay on for an extended period of time. The thermostat is supposed to not allow coolant flow in the radiator until the engine reaches operating temperature. If you drive the car for a couple of minutes, from cold start, the radiator or upper hose should be cool until the engine reaches operating temp.

Mar 15, 2011 | 2003 Volkswagen Beetle TDI

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2000 Dodge Caravan 2.4 L Radiator fan motor will not stop running with engine off.

The fan should continue to run until the coolant reaches the shut-down temperature as determined by a sensor. Check the coolant level, is the van running hotter than it used to? A radiator flush may resolve the problem as build-up in the system can coat the sensor, preventing it from operating correctly.

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Over heating engine, can drive for 1 mile without damage?

Any engine, when cold, takes at least 3 miles before reaching operating temperature.. After reaching operating temp it still takes a mile or 8(depending on your vehicle) before "over" temperatures are reached. Therefore if needed, a vehicle can be driven several miles without any coolant/water at all before overheating and causing damage, if started from from cold.

Dec 26, 2010 | 1999 Lincoln Continental

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I drove about 5 miles with heat and when i pulled back into my drive way it was like someone turned the ac on. why?

The RPM while driving were higher than when you pulled into the Driveway.
Check and top off the Radiator Fluid. Low levels cause this fluctuation. Make sure the engine is cool. Remove the radiator cap. Turn the engine on and turn both the front and rear heater on high when filling. Make sure you use only straight Radiator Fluid (not mixed) in the Reservoir. Replace the cap before it reaches normal operation temperature.
Now check the heating inside with the van. Is it any better?
IF NOT: There maybe a problem with the thermostat, egine coolant temperature sensor, or with the Water Pump itself. I would start with the Thermostat replacement, followed by the Sensor, before replacing the Water Pump. Work $mall and up to Big to save you money.

Jan 03, 2010 | 2003 Dodge Caravan

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My 1999 VW new beetle stalls when it warms up. This has happened 5 times now. There is a temperature light that goes out when engine is warm. If I let the car sit for half hour or so it will start again....

The thermostat on your volkswagon helps the engine keep operating at a predetermined temperature for best fuel economy and engine performance. However, the thermostat mechanism wears down after months of use and subsequently fails. If stuck in the closed position, the thermostat will not allow coolant to circulate, causing the engine to heat up dangerously; if stuck in the open position, the engine will never reach proper operating temperature, causing fuel consumption and poor engine performance. In either case, the thermostat must be replaced. Its fairly cheap

Aug 28, 2009 | 1999 Volkswagen Beetle

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