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Crank Case Heater for a Air to Air Heat Pump

What does it do and will it help produce more heat quicker, and where and how is it hooked up

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The heater is in the bottom of the compressor in that round hole to keep the compressor warm in the winter to help on start up

Posted on Nov 23, 2008

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Heater, ac and fan speeds all working fine. Compressor not kicking in...just auxiliary heat working.


Outside temp too low, so outside thermostat and it's settings will not allow the heat pump to work. But insist on the ausilary heat to work instead. Heat pumps usually do not produce enough heat when below 40F outside temp. If you have Gas heat, it may be more economical than the heat pump below 40F. If electric auxilarry heat, it may compete at 32F. Talk to your dealer, installer, or manufacture.

Mar 04, 2015 | Amana PTH123B25AJ Heat Pump Air...

2 Answers

Why does the heater blow hot air when I drive after its been idling for 15min and not during the idle when it reaches the 100 Temp?...(it blows cold air in idle)


Firstly, a thermostat that opens quicker will not give you better heat. Your heater core may be partially plugged causing a low flow issue. Another area to check would be the water pump impeller for corrosion or slipping on the shaft. Does the vehicle's cooling system operate well otherwise?

Jan 27, 2015 | 2002 Pontiac Grand Am

1 Answer

No in car heating,blowers working fine but it wont produce heat. Its a 51 plate grand cherokee Thanks


If it won't produce heat then you have an issue with your heater core. The heater core could be bypassed, in which case no hot coolant will get to it to produce heat inside the cabin. The heater core could be stopped up with dirt/debris, in which case the heater core can't radiate heat to produce heat in the cabin. The ducting in the dash could not be allowing the hot air to flow to the vents - therefore no heat in the cabin. I'd start with the heater core and check to see if it is bypassed. This generally happens on older vehicles because the parts can be harder to find.

Nov 01, 2011 | 2001 Jeep Grand Cherokee

2 Answers

Heat only works when car is going fast


Sounds like the fan will not run, and the air pressure from moving quickly is the only air running through the heater core. Check all the fuses in the fuse block for any open (blown) fuses. If there are no open fuses, have your mechanic check for vacuum leaks, as they may be inhibiting the motion of the louvers that re-direct air in your heating system. (That is, if the fan DOES run and there is still no heat without moving quickly.)

Jan 06, 2011 | 2005 Nissan Pathfinder

2 Answers

MY HEATER BLOWS HOT AIR THEN BLOWS COLD THEN HOT THEN COLD,ICHANGED THE MOTHER BOARD, RELAY SWITCH, AND THERMOSTAT, IT IS RUN FROM A HEAT PUMP WITCH I HAD CHECKED AND IT WORKS FINE


I have a lux electric thermostat my furnace will blow out heat for about one hour to maybe three then it will start blowing cooler air,I then cut it off for thirty seconds or longer once I do that it will start blowing out heat again then it will repeat it self again what could be the problem.

Jan 07, 2010 | Heating & Cooling

5 Answers

What's the difference between EM HEAT and AUX HEAT?


Sorry, neither of these answers are completely correct.
You have a heat pump (or the wrong thermostat). Let's assume you have a heat pump.

In air conditioning mode, it works like every air conditioner you have ever had, but...

In heat mode, it reverses its operation. Have you ever felt the air coming out of the outdoor unit of your A/C unit? It's hot, isn't it. And the air coming out of the indoor unit (out of the registers) is cold. Now for a heat pump to produce heat it simply runs the air conditioner in reverse and the heat comes out in the house and the cold is released outside. Neat, huh!

Here's the problem with heat pumps...when it is really cold outside the heat pump can't produce enough heat to heat your home. So it has an additional heat source called "Auxiliary Heat". This heat comes on automatically when the house doesn't get warm enough. The source of this heat is based on the region of the country you are in. North/Northeast generally have oil heat, other regions have gas, and still others have to use electricity to heat. In Texas, we usually use electricity as the supplementary heat on heat pumps. VERY EXPENSIVE!

Now the "Emergency Heat"...this is exactly as stated in Solution #2. This is manually turned on by YOU at the thermostat when your heat pump fails. This turns on the auxilliary heaters and turns off the heat pump (remember, the reverse air conditioner). Again, this can be quite expensive to run if your heat source uses electricity! Gas and oil may be cheaper. The emergency heat is only designed (normally) to keep the house livable (not comfortable) until the Heating Tech can get out to you and fix your heat pump.

Something else you should know. It is normal for a heat pump's outdoor coil to frost up during heating mode. It will detect this and go into DEFROST mode and melt the frost off the coil. While it is doing this, it will turn on the auxilliary heater to keep the air blowing in the house at a reasonable "warm" temperature, but it will not be as hot as normal. In fact, heat pumps produce a lower temperature heat than traditional heaters. So the air may feel cooler during heating than you are use to anyway. This is normal and is not a sign of a problem.

So what do you do: Set your thermostat to the temperature you want and set the controls for HEAT/COOL and FAN-AUTO/ON and leave the EMERG HEAT off unless your heat pump breaks.

As always, keep your filters clean and your outdoor unit's coils clean and free of debris.

Hope this explains your question for you!

Oct 16, 2009 | Ruud Central System Air Conditioner

2 Answers

No heat in my dakota. flushed heater core and replaced therm with a reg one.


check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose

Oct 04, 2009 | 1987 Dodge Dakota

1 Answer

My heat pump doesn't produce cold air. The compressors come on but the condenser fan doesn't. Any suggestions??? Thanks George


A heat pump has more than just the contactor to contro the condenser fan, if it is getting power to the fan then repalce the fan and the capacior, if ther is no power it could be the defrost control sensor, or the defrost board, as the fan must shut off during the winter to provide a quicker defrost when in heating mode, hope this helps...

Jul 13, 2009 | Heating & Cooling

2 Answers

2006 ford f-250 diesel with no heat


it takes quite a while for a diesel to warm up by just idling in order to produce any heat.you have to put them under a load (drive it), before you will get any noticeable heat.if you have a block heater, plug it in 4-5 hours before you plan on driving it and that will definitely help produce interior heat quicker.

Feb 22, 2009 | 2006 Ford F-250 Super Duty

1 Answer

Carrier Thru-Wall Heater and Air Conditioner won't heat


http://www.residential.carrier.com/support/troubleshooting.shtml
Here is some troubleshooting tips.
Also service available.

Feb 25, 2008 | Carrier 52PQ307 Wall/Window Air...

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