Question about Mastercool 67680 Evaporative Cooler Air Conditioner

1 Answer

After long heat, turned on evap; cool air not flowing. What is possible cause?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that gotĀ 5 achievements.


    An expert who has achieved Level 3.


    An expert that hasĀ over 500 points.

  • Master
  • 449 Answers

Your reversing valve is stuck in the heat position

Posted on Sep 10, 2010

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

To continue from my last Question, to do with HVAC Evaporator/Condenser Cycles, how often should the System go into Heat Standby, Heat Defrost, and Heat Modes? What are Heat Standby and Heat Defrost?

In this type of system (heat pump), the evap and condenser swap functions by means of a reversing valve, according to the mode selected. Evaps throw off cool air, condensers, warm air. In heat mode, the condenser is the indoor coil and it throws off heat from the outside air. Vice versa for the cooling mode. Heat Standby would be whenever the temperature thermistor has reached set point by the user and shuts down the system. Heat defrost is the cycle that reverses refrigerant flow and defrosts the outdoor coil by sending warm refrigerant liquid to that coil. In heat mode, the outdoor coil builds frost and ice on its surface.

Feb 05, 2015 | Refrigerators


Most common heating and air conditioning problem.

the most common HVAC problem i find is that the air filter is needing to be changed or is missing witch causes the evap coil to get plugged up, causing low air flow witch will trip a limit switch during the heat mode , and in A/C mode will cause the evap coil to ice up .clean or change your air filter every other month and make sure it is put in facings the right way there is an arrow on the side of the air filter it should be facing in the direction of the air flow. also if your a/c condenser is out side on the ground make sure the coil is clean and clear of any weeds or other da bree that would restrict air flow

on Apr 20, 2010 | Heating & Cooling

1 Answer

What does obd 1 code 25 and 26 mean?

EOBD II Error Code: 25
System too Lean, Bank 1
Possible Causes:
- Intake/exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Injector(s).
- Evaporation emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
- Contaminated fuel.

EOBD II Error Code: 26
Fault Location:
System too Rich, Bank 1
- Evaporation emission (EVAP) canister purge valve .
- Fuel pressure.
- Injector(s).
- Heated oxygen sensor (HO2S).
- Contaminated fuel.
Hope that works.

May 24, 2014 | 1995 Toyota 4Runner

1 Answer

Light check engine obd p0172

Error Code: P0172
Fault Location:
Fuel Trim, System too Rich, Bank 1
Possible Cause:
Evaporation emission (EVAP) canister purge valve.
Fuel pressure.
Fuel Injector(s).
Heated oxygen sensor (HO2S).
Mass air flow sensor.
Engine coolant temperature sensor.
Element air cleaner, clogged.

Dec 08, 2013 | Toyota ECHO Cars & Trucks

1 Answer

Heat coming from vent when nothing is on. AC is noisy when turned on but is not blowing out cold air. What is causing this?

Could be a blend door problem. On most modern cars the coolant flows thru the heater all the time, and the HVAC system controls the cabin temp by opening and closing vent doors. When you turn or slide the temp selector it makes the blend door or doors open and close for the heater core and A/C evap.
I would have someone check under the dash and see if the doors are moving.

Jun 27, 2012 | Cars & Trucks

1 Answer

I have got a gree 60000btu under ceiling unit, the suction pipe is icing up back to compressor its running on 360kPa suction and if I top up the refrigerant it does not change

major causes of evap.freezing dirty coil,evap fan motor or capacitor low on freon.moisture in system. first turn off cooling run fan to completely thaw unit. if possible clean coils and blower wheel. any unit running efficiently the evap coil will be at freezing or below. the key is to have enough airflow across the coil to remove the heat and humidity.its very easy to introduce air and moisture into the system. i have seen alot of techs. over the years make the same mistakes over and over again. when hooking up guages they dont purge the lines back; worst case is only to evacuate freon pull a vacume and recharge

May 22, 2012 | Heating & Cooling

1 Answer

Can low air flow across the evaporator coil cause the high pressure cutout to trip on a heat pump during the summer? If so, how.

No, Just the opposite will happen. If you have low air flow across the Evap. this will cause the refrigerant to "puddle" or become dormant. Causing low head due to evap. frosting or coil freeze up. With low air flow your system is not transferring heat to the refrigerant in the evap. coil, so it (the evap coil) just gets colder and colder, lowering the pressures. Here are things which cause Hi head pressure, dirty condenser coil, low air flow across the condenser coil, air in the system, bent or kinked tubing before the evap. coil. Crushed fins (causing restricted air flow) in the condenser coil. With low air flow across the condenser coil, you can not "cool" the refrigerant, in other words get the heat out, it stays in the refrig. and kind of cooks the system. If your system is shutting off due to hi head, get a water hose and clean your outside coil first. Pull the power cut off, should be right there at the outside unit. turn it off at the t-stat. pull the power at the unit. Wash the condenser coil good. Do not use a press. washer as they can bend the coil fins making things worse. Use a bit of soap in a bucket, fill that with water and splash into the coils let that sit and hose it out. It is best if you can work from inside out (opposite of air flow across the coil, backwashing) but you have to remove the fan shroud to do so. If after you wash the coil, you still have a hi press issue you will need to do more troubleshooting. Hope this helps Fix Ya up.

Jul 09, 2011 | Heating & Cooling

1 Answer

What is po411 and po445 for 2006 vw jetta/

P0411- Means Secondary Air Injection System Incorrect Flow Detected!
Possible causes - Vacuum hoses damaged.
- Air Pump inoperative.
- Air bypass solenoid circuit open.
- Air bypass solenoid leaking/blocked or stuck open/closed.
- Air diverter valve leaking/blocked or stuck open/closed.
- Air air hoses r Possible solution - Visually inspect vacuum lines for disconnects in the AIR systems and visually inspect for proper vacuum line routing. Repair if necessary.
- Disconnect the air pump hose at the solenoid valve, start the engine and see if there is air being pumped P0445- Means Evaporative Emission Control System Purge Control Valve Circuit Shorted! Possible causes - Damage harness or connectors to the Purge Control Valve
- The valve circuit is open or shorted
- EVAP canister purge volume control solenoid valve may be faulty
P0445 Description The EVAP canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the ECM. The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve. When is the code detected? - An excessively high voltage signal is sent to ECM through the valve

Jan 11, 2011 | 2006 Volkswagen Jetta

1 Answer

Compressor keeps freezing. Then I turn it to fan and it blows tiny bits of ice out the front.

There are two major reasons an air conditioner 'freezes up.'

#1 - low on freon

This is really "not likely" - especially if the unit is fairly new and has never been 'opened up.' By 'opened up' I'm referring to a procedure where 'valves' are installed in the system: usually welded, although a less desirable way to do the same - involves a self-piercing valve that is screwed into the line.

#2 - and the 'more likely reason' for the unit to freeze up - is "lack of air across the evaporator coil." The evap coil is the one where 'cool' air comes from.

Note: you should make sure all the ice is off the unit, so, you need to run it for a good while on 'fan only' to insure all the ice is gone and you are starting with a fully defrosted unit.

a) check the filter (in front of the evap coil) and make sure it's clean. Sometimes just a dirty filter can cause the unit to freeze. Remember - the idea is to allow air to flow across the evap coil.

b) if the filter has been changed often and is 'clean' then you're probably chasing rabbits here - "but" if the filter was "dirty" it's a good bet that the coil will be dirty and you should make sure you 'clean' it real good. Once you've cleaned the filter and the coil - the unit should quit freezing up.

#2A - also involves 'air flow' and is a 'far less possibility' but still - it's possible - so I will tell you about it.
Sometimes 'motors' will start to break-down (electrically) from age or whatever. Usually the bearings (which can't be oiled anymore) will start to wear causing the fan motor to 'heat up.' When the motor 'heats up' it will cause the amps to rise and eventually the 'internal overload' which is in the motor will 'open' causing the motor to "stop." When the motor stops - air flow stops and the unit will freeze. The interesting thing and a sometimes troublesome thing from the Service Tech's veiw is - that once the motor cools off - the internal overload will 'reset' and the motor will come back on and unless someone is there to see this happen - it's always in the background of the Service Tech's thinking, i.e. is the motor cycling "on and off" on the internal overload. Like I said - this is such a rare occurance that it doesn't come into play much - but hey - it does happen - so if your coil and filter were clean - you might watch the unit and see if the motor (fan motor) is going off.

hope this helps

Jun 12, 2010 | Heating & Cooling

2 Answers

P0441 EVAP Control System Incorrect Purge Flow

Error Code: P0441
Fault Location:
Evaporative Emission (EVAP) System - Incorrect Flow Detected
Possible Cause:
Malfunction Indicator Lamp (MIL) active.
Evaporative Emission (EVAP) Canister Purge Regulator Valve faulty/jammed.
Evaporative Emission (EVAP) Canister Purge Solenoid Valve faulty/jammed.
Evaporative Emission (EVAP) Canister Sealing faulty.
Pipes between Tank Breathing and Throttle Body leaky/blocked.
Hose connection(s).
Intake leak.
Possible Solutions:
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Perform Output Test.
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve.
Check Evaporative Emission (EVAP) Canister.
Perform Basic Setting.
Check Pipes between Tank Breathing and Throttle Body.
VSV connector near air filter box disconnected.

Jun 15, 2009 | 1996 Chevrolet Monte Carlo

Not finding what you are looking for?
Mastercool 67680 Evaporative Cooler Air Conditioner Logo

Related Topics:

36 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mastercool Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Boyet Soriano
Boyet Soriano

Level 2 Expert

293 Answers

Are you a Mastercool Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides