279D Skid Steer

[Mitch O]

The air conditioning is lacking. In cool time of morning it blows cold air, but once the temperature rises outside it stops blowing cold air??

 

[92U 3406]

Throw some gauges on it and let us know what the pressures are running when its blowing warm air.

 

[Nige]

Also known for getting evaporators and ducts blocked with cr@p & crud. Sometimes only a complete disassembly of the ducting, clean the evaporator, pull the radiator apart, clean the condenser, etc, etc. will work. Need a S/No for more specific details - too many options out there.

 

[kshansen]

I know about nothing about AC systems, shop always farmed that out once we started getting equipment with those on them.

But the one thing I do know is cleaning things is critical. Any place air goes so will dust and cr@p and a little moisture turns the stone dust to cement and no more air flow!

 

[Zewnten]

Unfortunately cat packs most of the AC into a little black box but that being said once you open it everything is right there. I always check the charge first then like Nige says if that's good the thermostat may have fallen out of the evaporator, the evaporator could be full of dirt, air filters could also be clogged. What is the temperature at the vents and what is the ambient temperature at the same time?

 

[Nige]

I generally go first with anything that doesn’t require special tools, so for me I’d be checking cleanliness inside the black box and the duct and simple things like belt condition & tension first.

 

[kshansen]

I generally go first with anything that doesn’t require special tools, so for me I’d be checking cleanliness inside the black box and the duct and simple things like belt condition & tension first.

I often said the best mechanic is a lazy and cheap one.

I always tried the easy stuff first, check fluids, wash machine and stuff like that. Then if there was a point at which replacing a part seemed the way to go and I was not sure what needed replacing, replace the easy $5.00 part long before going for the hard to reach $1,000.00 part.

Now if we can convince someone with a D9H to follow that plan we and him will be money ahead!

 

[CM1995]

What year model is your 279D? I've got a '16 that after 3 years still blows ice cold.

 

[Mitch O]

What year model is your 279D? I've got a '16 that after 3 years still blows ice cold.

It's a 2014.

 

[Mitch O]

Thanks for all of the responses. I now have some where to start. Will post results when I get them.

 

[Nige]

Post a Serial Number and I will put up an illustration of what your ac looks like inside.

 

[Nige]

Come to think of it, have you replaced both the filters (fresh air & recirc) with new..?

 

[Mitch O]

Post a Serial Number and I will put up an illustration of what your ac looks like inside.

GTL00687

 

[Mitch O]

Come to think of it, have you replaced both the filters (fresh air & recirc) with new..?

I don't recall doing that.

 

[kshansen]

I don't recall doing that.

No air flow no cool air!

Replacing those on the quarry equipment was at least every engine oil change warm or cold weather!

 

[Nige]

I don't recall doing that.

Damnit..!! Beaten to it by Hansen.

Really.......... Do you not change the engine lube oil filter and fuel filters also..? They're all kinda part of a regular preventive maintenance program.
Another question. Do you have an Operation & Maintenance Manual for it..? If you don't I can give you directions on how to get one. Probably the best $50 you will ever spend...........

Attached is how to change the aircon filters. Part Numbers are 265-6618 and 265-6619. I suggest that you change both as a first step. Price is about $50 the pair. DO NOT mess around trying to clean them, especially at that price.
There is also an attachment of how to D&A the aircon and the heater. I don't recommend you disassemble the whole thing but Steps 6 & 7 of that procedure are relevant because they show you how to get at the core which is probably by now full of a mixture of dust & cr@p that resembles concrete. A lack of air flow through that core will also put a serious crimp in the way the a/c functions. While you're at it, go for the trifecta. Open the door at the back of the machine and give the a/c condenser a good wash, just for sh1ts & giggles.

 

[Nige]

Here's a couple of illustrations showing what the box looks like. The blower motor is down in the bottom.

 

[heymccall]

That looks like a heat only unit. Where's the evaporator?

 

[Ronsii]

That looks like a heat only unit. Where's the evaporator?

Well.... no wonder it won't blow cold...

 

[heymccall]

That looks like a heat only unit. Where's the evaporator?

Nevermind...I sees the orifice tube.