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#1
10-09-2007, 11:18 AM
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A/C blows hot.
Hey folks!
I have a 84' 300DT. Y/D, after work I started the car up and set sail for home. To my suprise the A/C system started to blow hot. It was 93F outside and my thermostat was on 22C. My center vent does not work so i suspect a vacuum issue there. But the temperature control has not been a problem before. Any suggestions to the problem. Thank you BTW: This site has saved me lots of time and money and i just want to thank everyone for being so helpfull and knowlegable. 
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#2
10-09-2007, 12:34 PM
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Quote:
when mine did this it was because of the valve on the passenger side firewall. it is supposed to regulate the flow of engine coolant. it turned out that the terminals were dirty and it was not closing. this should have 12v when the temp is all the way clicked down.
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 1982 300CD Turbo (Otis, "ups & downs") parts for sale 2003 TJ with Hemi (to go anywhere, quickly) sold 2001 Excursion Powerstroke (to go dependably) 1970 Mustang 428SCJ (to go fast) 1962 Corvette LS1 (to go in style) 2001 Schwinn Grape Krate 10spd (if all else fails)
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#3
10-09-2007, 01:01 PM
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That would be a monovalve. You also need to make sure the compressor is operating and that freon pressures are good.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#4
10-09-2007, 01:22 PM
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Was the problem with the center vents pre-existing or did it occur concurrently with the hot air episode?
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#6
10-09-2007, 06:39 PM
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If it's "heater hot," the monovalve is open for some reason. Maybe a bad monovavle, maybe a fuse, maybe a control unit.
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#7
10-09-2007, 08:19 PM
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Quote:
If you have 12V then it is probably the valve insert that has gone bad. If not, then you probably blew the climate controller or the fuse. The fuse also controls things like the transmission kick down and the reverse lights so if the fuse goes you should notice other things "wrong" with the car. The CCU can blow due to the Aux water pump drawing too much current and melting the solder. Do a search on CCU fixes to see how to repair it. It is pretty easy, but takes some time and a soldering iron. To change a bad monovalve insert takes five minutes and the loss of a little coolant. You can get replacement inserts many places including on this site. It is funny how my BMW uses the same monovalve but as never had an issue in 24 years. Wonder if I just jinxed it...
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy" Current Monika '74 450 SL BrownHilda '79 280SL FoxyCleopatra '99 Chevy Suburban Scarlett 2014 Jeep Cherokee Krystal 2004 Volvo S60 Gone '74 Jeep CJ5 '97 Jeep ZJ Laredo Rudolf ‘86 300SDL Bruno '81 300SD Fritzi '84 BMW '92 Subaru '96 Impala SS '71 Buick GS conv '67 GTO conv '63 Corvair conv '57 Nomad 
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#9
10-10-2007, 07:43 PM
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Check all fuses on the firewall in the engine compartment.
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-disav 99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete 98 E300 TURBODIESEL Alexandrite Green on black leather 289K 95 E300 DIESEL Green Queen 267K SOLD 84 300D 216k SOLD 87 300D 299K #22 head - intercooler - full load adj. - 8sec 0-60mph - SOLD 76 300D 214K SOLD
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