Dash air

Topic: Dash air (Read 2304 times) previous topic - next topic

Re: Dash air

Reply #25 – June 18, 2017, 10:35:32 pm

Quote from: Jimmyjnr – June 18, 2017, 09:39:22 pm

So the dash fan and door system is working, the compressor pulley is spinning and clutch is engaged, the fan on back of radiator is running, so that leads me back to loss of refrigerant?

If the clutch is engaged you wouldn't be low on refrigerant. Low pressure switch would cut the compressor off. As posted by Red Tractor get some gauges. Then post your numbers and maybe I can help. All of my motorhomes have always had good dash air. More BTU than roof airs. They didn't always work when I bought them but all were simple to repair.

Re: Dash air

Reply #26 – June 18, 2017, 11:03:47 pm

Was just at harbor frieght today ?
May do a reverse loop tomorrow and get a set , any particular setup required?

Re: Dash air

Reply #27 – June 19, 2017, 09:38:23 pm

Get a set for R134a then they will hook up to your fittings. The ones I got came in a plastic carrying case and have to be assembled but that is very easy and there are instructions included.

Re: Dash air

Reply #28 – June 19, 2017, 10:01:34 pm

Not so sure that the compressor running is a good indication of a proper change. My coach low pressure switch will declutch at 10 psi suction pressure. It will depend on temps, but my best evap temp is achieved with 30 to 45 psi on the suction side. At 10 psi had very little cooling, but compressor was turning.

Re: Dash air

Reply #29 – June 19, 2017, 11:04:33 pm

Depending on ambient temp, my thermostat cuts the compressor off at 40 deg. at the register with 20 psi on the low side.

Re: Dash air

Reply #30 – June 24, 2017, 08:23:29 pm

Ok gauges arrived today
Ambient temp 85f
Engine off
Low side 85psi
High side 80 maybe 85 it was hard to read
Engine running
Low side 5psi
High side 120psi
Campground is packed so I had to be quick , engine only ran few minutes and only at idle.
Just wanted to get a sense of the problem

Re: Dash air

Reply #31 – June 24, 2017, 08:30:47 pm

Add Freon with the dye-check and get the low side up to 20-25 psi. Just one can of Freon with dye and one just R-134a With the compressor off the pressures will always equalize.

Re: Dash air

Reply #32 – June 24, 2017, 08:42:37 pm

So add freon with dye ( via gauges or direct into low pressure port ) ?
Going to assume engine and compressor running ?
Then 134a again via gauges or just straight into low port ?
Do I need glasses and light to see dye ?

Re: Dash air

Reply #33 – June 24, 2017, 09:06:00 pm

You probably can't add a can of Freon through the gauges. My gauges will only hook up to a 30lb bottle or something similar.
Yes you need a light and glasses to see the UV dye.

Re: Dash air

Reply #34 – June 24, 2017, 10:02:45 pm

Using 1# cans you will need a Freon can tap to go from can to center gauge hose. Available at any parts store or off the net.

Pamela & Mike

Re: Dash air

Reply #35 – June 25, 2017, 09:12:25 pm

Quote from: craneman – June 24, 2017, 08:30:47 pm

Add Freon with the dye-check and get the low side up to 20-25 psi. Just one can of Freon with dye and one just R-134a With the compressor off the pressures will always equalize.

Always watch the high side....it tells if it is overcharged or another issue.

Re: Dash air

Reply #36 – July 01, 2017, 01:24:22 am

Got some dye and frown into system , at idle low side 20psi high side 180 psi .
Drove to CG outside was around 90f and dash air was cool not cold !!
checked compressor and rear radiator and connections, no signs of leak .
Anyone know where front evaporator is located under dash and how to get to it ?

Re: Dash air

Reply #37 – July 01, 2017, 08:49:40 am

Here is its location to check for leaks.

dash air expansion valve

Re: Dash air

Reply #38 – July 01, 2017, 09:35:10 am

Wow , have no idea how to get into dash , I know the curved section behind instruments just pops out but the flat top above slide out tray is a mystery.
I will further investigate when we stop tonight

Re: Dash air

Reply #39 – July 01, 2017, 10:25:44 am

Jimmy, I think yours is same as our 2000 in so much as you first lit the curved top up then pull up on the centre one you mention.
if wrong, sorry.
johnH

Re: Dash air

Reply #40 – July 01, 2017, 11:09:45 am

John, you are right, the flat tops are held on by Velcro. Kinda hard to remove but they do come off.

Re: Dash air

Reply #41 – July 01, 2017, 11:16:51 am

My 2000 center dash is hinged at the front with brass bead latches at the back. [Similar to the curved piece] You might need both hands, as it is well seated.

Re: Dash air

Reply #42 – July 04, 2017, 09:02:27 pm

Started removing dash trim to find dash evaporator, don't want to disassemble more than necessary.
Any advice would be greatly appreciated

Re: Dash air

Reply #43 – July 04, 2017, 10:02:14 pm

Removed another section!

Re: Dash air

Reply #44 – July 04, 2017, 10:26:44 pm

If it uses R 134-A refrigerant you can get do it your self kits at any auto or big box store to put in refrigerant, but it might leak out again if you don't find the leak. The cans of refrigerant run $5 to $10 depending on where you get them. Might take several.

Wantabe

Re: Dash air

Reply #45 – July 05, 2017, 03:08:50 pm

Looks like I may have to open up the drivers footwell , can't see anyway in from top or passenger side !
If any of you guys can advice ??

Re: Dash air

Reply #46 – July 05, 2017, 04:44:07 pm

Jimmy,
I have a more expensive one of these, but this might save you a lot of time. If you have a leak at the evaporator this will find it at one of the registers at the dash. I had to resort to one of these to find the leak on my Grand Cherokee. If it doesn't find anything you don't have to remove any more dash parts.

AGPtek Refrigerant Halogen Freon Leak Detector CFC HFC HCFC Air Gas HVAC...

Re: Dash air

Reply #47 – July 06, 2017, 06:55:50 pm

That sounds like a plan, because digging further into the dash doesn't look like fun

Re: Dash air

Reply #48 – July 07, 2017, 10:08:59 am

Jimmy,
When I changed my dash air blower motor I removed the center (front) of the dash so I could get in through the front.
Only a few screws on mine to get that off.
One required removing an air vent and using a long screw driver to get back to that screw. Yours is newer so you will probably have more wires to disconnect to get that center piece out of the way.

Re: Dash air

Reply #49 – July 07, 2017, 12:54:25 pm

John
Not sure which center piece your referring to . Looking like evaporator is buried deep in dash near windshield

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