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Apu fails on heater system

I have a proheat apu unit on my truck that runs perfectly as long as the a// is on but when i turn it to the hearter mode it falters and shuts the power off to my tuck ,,, whay would it do this ??

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Does heat pumps from 1980"s work without freeon for the heat part?

Posted on Dec 23, 2008

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HVAC not working. I do not have any faults


Randy, Being this new of Truck, take it back under warranty and have HVAC repaired.

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Carier unit starts then shuts down says apu power apu f/b


Low freon: When not running the pressure equalizes. When the unit starts the pressure drops on the low side and the low pressure switch turns it off. This protects the compressor when there is not enough freon to carry the oil it needs

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Thermoking apu starts up then runs for a min then shuts off and shiws a code ac5 .what is this code?


If the unit starts and runs for a short period then The code will refer to either low gas or excessive gas in the system or the thermostat to control the temperature is set to close to ambient temperature. I would go for low gas from a leak in the system

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No water is going thought the hearter core


ensure that the heater tap is turning on when you select heat. you may need to have the coolant system pressure bled to remove any air in the system at the heater core.

Dec 09, 2013 | 2001 Dodge Caravan

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Ronmcmiller@yahoo.comi'm getting a nice sheet of ice on evaporator,when the system goes into defrost the ice will not drop, the unit seems to stay in a semi defrost stage. what do I do to repair this...


Hello Ron,
It sounds to me as if either the defrost thermostat is weak and cutting the hearter off before all frsot is melted OR the defrost timer is running too fast and not giving sufficent time for frost to properly melt. The usually total time the refrig will spend in the defrost mode is 25-30 minutes,that is the time from when it starts defrost mode,until the time it goes back to cooling mode,typically all the frost will melt within 15 minutes, but it still stays in deforst mode if the heater is on or off until the 25-30 minutes has elapsed. Now if you have a older (late 1980's to mid1990's) General Electric the problem is more severe and the compressor is bad, but only ge brand during those times.

Gene

Aug 07, 2011 | Refrigerators

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Runs hot and hearter not blowing hot air


a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.

last thing you can check if heater core is ok. is the thermostat.

Feb 18, 2010 | 1999 Pontiac Montana

1 Answer

Hearter core removal


  1. Disconnect the negative (-) battery cable.
  2. Drain the engine coolant into a suitable container.


CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  1. Disconnect the heater hoses. Be careful not to damage the core by pulling on the hose to remove. Cut the hoses if they will not come off easily.
  2. Remove the instrument panel.
  3. Disconnect the resistor assembly.
  4. If possible, disconnect and move the duct (non air conditioning) or the evaporator housing (air conditioning) to the right to gain clearance for the heater unit. If equipped with air conditioning, do not disconnect air conditioning system until absolutely necessary. Refer to for discharging, evacuating and recharging the system.
  5. Remove the instrument panel stay and heater unit.
  6. Disassemble the heater unit by removing the duct, mode control case, core assembly and heater core.

To install:
  1. Assemble the heater unit by installing the duct, mode control case, core assembly and heater core.
  2. Install the heater unit and instrument panel stay.
  3. Connect the duct (non air conditioning) or the evaporator housing (air conditioning) to the heater unit. Evacuate and recharge the air conditioning system if the system was discharged to remove the evaporator assembly.
  4. Connect the resistor assembly.
  5. Install the instrument panel as outlined in this section.
  6. Connect the heater hoses. Be careful not to damage the core by pulling on the hose.
  7. Refill the engine coolant into a suitable container.
  8. Connect the negative (-) battery cable and check for leaks.

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1 Answer

Load rigmaster apu


Try running the exhaust in to the truck cxhaust pipe. Have a carrier that way and it quietened the exhaust noises. The fitting can be got from the dealer.

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I have a proheat 2x, and the pump will only spray water for a few seconds when unit is turned on, then nothing. The attachment is the same way. I think this is the pump failing, and the unit is only over a...


I just had my pump replaced for $66 and the repairman said this unit is notorious for this problem. He had 6 other units in his shop when we came in. Make sure you keep your clean water tank FULL, as he said the pump fails as soon as it runs dry.

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1998 Larado Jeep heater on/off problem


Sounds like the blower motor is bad. The motor has brushes in it that could be worn.
When the heat goes out, do you hear the motor running?

Dec 17, 2008 | 1998 Jeep Cherokee

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