Question about 1999 Dodge Ram

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1999 dodge 5,9 diesel warm heat only

Checked coolant, checked tubes to heater vary hot in and out, checked out side air intake and cab air flapper ( works with A/c) checked a/c and cab temp on dash with fan running engine running turned to a/c cold got cold turned to hot got a little warm, lot of air movement knob turned to defrost, some when moved to floor position did replaced thermostat 50/50 mix the one valve that has wires to it I could see movement when I moved the heat/a/c knob, this would also move the outside and cab air flapper I pulled the glove box out to get access to some of the heater assy

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  • Dodge Master
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First thing I would do is flush the heater core with a 4 to 1 mixture of water and muratic acid. Put it in there and blow it out both ways 3 or 4 times. Let the acid mix set for about 10 minutes before blowing it out with air. This is a cheap fix, if it works. $7 and your time. Got to say though, it only works about 30% of the time. The other 70% is to remove the heater core. Dodges/Chrysler su(k. To get to the heater core, you have to drop the steering column, and remove the entire dash. Then remove the heater/A/C plenum to remove the heater core. Buy a manual to do this. Way to many hidden screws and bolts. This job costs about $800 at a garage. It takes about 8 hours to do, if you know what your doing.

Posted on Dec 07, 2014

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Posted on Jan 02, 2017

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There may be an external heater control valve next to the firewall that is either vacuum or cable controlled.
the lever on the side opens and closes: warm coolant going into the heater core,inside the cab. If the valve is stuck,no heat.
If the vacuum to the valve is ZERO,it should open.
If the heater control vacuum hose is leaking air,you should get hot air ALL of the time.
people in the winter want heat NOW. Bypass the heater valve,under the hood with a section of copper or plastic tubing.
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Hey,
I'll assume for now that the blower motor is working.
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2. The thermostat. When the engine and coolant are hot, your top rad hose should be hot as well. See if the rad hose is hot to the touch. If it isn't, your thermostat might be faulty. It's a fairly easy and cheap fix as well.
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