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Adam Stratton 
Orange Level Access
Joined: 11 Sep 2009
Location: SW MO
Points: 1363
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 Topic: 7045 intermittent air conditioning
Posted: 07 Jun 2016 at 10:23pm |
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When I first turn on the A.C. on my 7045 it is cool enough to be comfortable. It will stay that way for 15 minutes or so, then it starts getting warmer and warmer. If I shut off the fan and the thermostat for about 5 minutes, then turn it back on it will be nice and cool again. If I turn off the thermostat but not the fan, the air just stays warm and doesn't get cool again when i turn it back on. Any ideas why it acts this way? Its better than not having a.c. at all, but would like to be cool all the time.
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SHAMELESS
Orange Level
Joined: 13 Sep 2009
Location: EAST NE
Points: 29486
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Posted: 07 Jun 2016 at 10:33pm |
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the condenser in the roof is freezing up. or it's low on cold juice.
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SHAMELESS
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Joined: 13 Sep 2009
Location: EAST NE
Points: 29486
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Posted: 07 Jun 2016 at 10:38pm |
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when my 7010 or my 2290 does that, I take the roof panel off and blow out the dust and caked mud up there, then all is fine again! if you take a hose and nozzle to it up there you'll gits a lot of water in the cab.
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Stan IL&TN
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Joined: 13 Sep 2009
Location: Elvis Land
Points: 6730
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Posted: 08 Jun 2016 at 6:56am |
Agree with Dale, it's going to be one or the other. 
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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MACK
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Joined: 17 Nov 2009
Points: 7664
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Posted: 08 Jun 2016 at 7:23am |
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Listen to shameless, he's got it right. Except the condenser is in front of radiator and evaporator is in top of cab. MACK
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CAL(KS)
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Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3747
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Posted: 08 Jun 2016 at 7:41am |
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we carry a toothbrush in the cab. you can pop the filter out and comb the evaporator to get the dirt/junk out without pulling the top. you will have to pull the top to remove the dirt and debris from drip tray and drain hoses or to clean any material that may also be blocking the heater core. blockage can cause it to to prematurely freeze up.
Edited by CAL(KS) - 08 Jun 2016 at 7:43am
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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