Heater not working

Tiny
JOEMO
  • MEMBER
  • 1997 DODGE RAM
  • 5.2L
  • V8
  • 4WD
  • MANUAL
  • 200,000 MILES
Truck is a 1500. AC blows really cold, all fan speeds work, I can hear the ‘clunk’ from the valve door (I believe this is cable operated on this year) when I switch the heat knob from cold to hot and back again. Both pipes running to the heater core are hot when the engine is at operating temperatures, the outlet slightly cooler than the inlet but both still really hot. Yet no heat.

When I switch the heat dial from cold to hot the air gets slightly warmer but no more than 40 degrees F

Cold this still be a heater core problem if both pipes are hot?

What else could I check?

Thanks
Joe
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Friday, October 25th, 2019 AT 6:46 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Welcome to 2CarPros.

It sounds like everything is working but the blend air door. You are correct. It is a cable. Here are the directions for replacement of the cable. Before getting a new cable, make sure nothing has come loose or broken. The attached pictures correlate with the directions.

_________________________________________

1997 Dodge or Ram Truck RAM 1500 Truck 4WD V8-5.2L VIN Y
Temperature Control Cable Replacement
Vehicle Heating and Air Conditioning Air Door Air Door Cable Service and Repair Procedures Temperature Control Cable Replacement
TEMPERATURE CONTROL CABLE REPLACEMENT
Fig 43 Temperature Control Cable (Heater-A/C Housing End)

Pic 1

REMOVAL
1. Lower the steering column and roll down the instrument panel.
2. Disconnect the temperature control cable from the top of the heater-A/C housing.
3. Remove the heater-A/C control.

Fig 44 Temperature Control Cable (Heater-A/C Control End)

Pic 2

4. Disconnect the temperature control cable from the beater-AC control.

INSTALLATION
1. Connect the temperature control cable to the heater-A/C control.
2. Install the heater-A/C control.
3. Connect the temperature control cable to the top of the heater-A/C housing.
4. Install the instrument panel and raise the steering column.

_____________________________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Friday, October 25th, 2019 AT 9:36 PM
Tiny
TMCCARTT69
  • MEMBER
  • 1997 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 146,000 MILES
The heater in my 1997 dodge 1500 pickup does not work - it blows cool air. It has a new thermostat, and a new water pump. Blower motor works fine. Any suggestions?
Tom McCartt
email - indygirl62@bellsouth. Net
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Friday, November 27th, 2020 AT 11:18 AM (Merged)
Tiny
JDL
  • EXPERT
Does the engine reach normal operating temp, do the heater hoses get hot? The heater core may need to be flushed? Could be a temp blend door actuator under the dash, not working like it should?
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Friday, November 27th, 2020 AT 11:18 AM (Merged)
Tiny
97RAMFAN_2010
  • MEMBER
  • 1997 DODGE RAM
Heater problem
1997 Dodge Ram V8 Four Wheel Drive Automatic 171k miles

hi I have a 97 ram and I cannot figure this out, my heat always worked good and eveything in the past, and for the past couple years no matter what setting I put it on the heat only blows out of the vents on the dash by the windshield (Defroster vents). No Air is blown out of any of the other vents any suggestions? Thnxs
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Friday, November 27th, 2020 AT 11:18 AM (Merged)
Tiny
JSWAIN
  • MEMBER
You most likely have a leak in one of the vacuum hoses. Check the hoses in engine compartment between firewall and intake manifold first to see if they are leaking. There are also one-way check valves (2 I think) in those vacuum lines. Make sure they are working properly (you should be able to blow through them in one direction only).
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Friday, November 27th, 2020 AT 11:18 AM (Merged)
Tiny
97RAMFAN_2010
  • MEMBER
Ok thank you I will look into this and see if this may be the problem iam having and get back to you thanks again.
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Friday, November 27th, 2020 AT 11:18 AM (Merged)

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