Heating system problem! - AC Auto Repair Help Forum


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Heating system problem!

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comprehensive12345
New User

Dec 3, 2009, 2:53 PM

Post #1 of 4 (2099 views)

Heating system problem!	Sign In

1994 Dodge Caravan 3.0 L engine 279 000 km.

Heater is giving out heat but should be much better! Heater blows out cool air when idling.
When driving it puts out heat but it should be much better!

What have I already done? A new winter thermostat has been installed. The air flow from the fan is strong.
The line into the heating core is hot to touch. The outline is also hot. antifreeze is circulating properly.
Any common problems to dodge I have not checked yet?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 3, 2009, 4:10 PM

Post #2 of 4 (2084 views)

Re: Heating system problem!	Sign In

Please define what a "winter thermostat" is.

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

comprehensive12345
New User

Dec 4, 2009, 12:11 PM

Post #3 of 4 (2072 views)

Re: Heating system problem!	Sign In

winter thermostat is 195 degrees f.
Hoses on both sides of heater core are hot to touch.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 4, 2009, 12:59 PM

Post #4 of 4 (2066 views)

Re: Heating system problem!	Sign In

There is no such thing as a "winter thermostat". That vehicle requires a 195 stat year round and will have computer/mixture issues if anything else is installed.

Since both heater hoses are hot, you can eliminate anything to do with the coolant, although I have my doubts about that being accurate since racing the engine increases the temp.

The heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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