Question about 2002 Chrysler Town & Country

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Loosing antifreeze but no visible leaks and none in engine oil. Also heater blows cold. Could thermostat be causing it to blow it out of overflow tube?

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Hello, you may be right on the money.

How to test the thermostat in most vehicles;

Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

What the thermostat does;

It seperates your coolant into two parts. The first part is in your engine, the second part is in your
radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating
on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now
the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows
from the engine into the radiator and reservior to be air cooled by the radiator fan.

I hope this helps you.

Posted on Feb 02, 2011

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1 Answer

Blows cold air from heater


Some things it could be but not specific to your vehicle.
Do you smell antifreeze? Engine temps running hot? Has it run hot?
No antifreeze in radiator, when cold take radiator cap off and look to see if it is full. add as needed in radiator and overflow container.
Heater control valve not working properly or inop.
Clogged heater core. Leaking heater core-heater core bypassed.
Heater box door not operating properly or inop.
Vacuum leaks or broken lines/cables.
Intake manifold leaks
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Could be many things, checks/tests need to be performed to determine the cause either by you or a certified repair shop.

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1 Answer

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If there is a internal antifreeze leak, there will be antifreeze mixed in your oil. Check your oil. If there is antifreeze in there, you probably have a bad head or base gasket. Worst case scenario is your block is cracked somewhere. Check your heater core and the lines as well. If the heater core is bad it will be leaking.
Check the thermostat housing for a leak. Sometimes
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1 Answer

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first likely problem is low antifreeze. If there isn't enough, it can't fill the heater core. wait til it cools down - about five minutes in this weather ;) and then open the radiator and fill it with antifreeze/water combination. If it takes a bit (more than a few pints, then you might try adding some Bars leak or radiator stop leak junk.

If radiator is already full then you probably have a blocked heater core or a stuck thermostat and will need to take it in.

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1 Answer

I checked all the fuses, none bad. Heater is only blowing cold air


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