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A/C problems in a 300TD
Symptoms:
Condenser fan does not come on. I tested fan with 12 volts and it works fine. 12v at one of the plugs on the drier (the one with 2 wires on the connector) when system switched on (and motor running) Jumped plugs on drier and still no fan workie Compressor comes on when it wants to. Can rev the engine and often hear the clutch click but not engage. Clutch does engages occassionally. There is charge in the system (and oil) Fuses are good. I swapped ACCs with a good used one and still get same symptoms. When the compressor runs while driving, the system does produce cold air. I don't operate it in traffic since the condenser fan is not working. Ideas?
__________________
Make Biodiesel Not War '85 300TDT |
#2
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Is your car a Wagon ?
What year is it ? Be sure you jumped the correct plugs on Rec/dryer.... what do you mean by this ---"I swapped ACCs with a good used one and still get same symptoms." Is that the stuff in the dash ? How do you know it was good ? Have you checked any of the solinoids in the system ? Can't think of the usual name for those... switches which control larger currents by use of a smaller one.... ( and don't any of you say transistors either )....the fan is probably controlled by one....oK, thought of it.. electromagnetic relay..... |
#3
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Hmmm
Quote:
Use a feeler gauge to check the air gap.
__________________
ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#4
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Car
Quote:
__________________
Make Biodiesel Not War '85 300TDT |
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Air gap
Quote:
__________________
Make Biodiesel Not War '85 300TDT |
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Have you found the condensor fan relay and checked it ?
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Fan relay
Quote:
__________________
Make Biodiesel Not War '85 300TDT |
#8
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Hey,
It would help if you put your vehicle make and model and where you live in your profile. The relay, at least in my car, is in the fuse block. It's the front right and the one directly behind it is the compressor clutch relay. They can be either silver or black in color. Danny
__________________
1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#9
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Quote:
Also, for the ACC, even bad ones should operate the A/C when the Temp wheel is all the way to cold, the fan switch is manually on high and full operation is selected (button next to defrost.) All the bad units I've repaired at least still worked in manual operation. I'd suspect something under the hood. Try the fan jumpering as explained above and LUK what you find. If nothing else, we're getting into summer, you should be able to supply 12v to the fan so it's on all times while running. Good luck.
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1984 300D Turbo - 4-speed manual conversion, mid-level resto 1983 300D - parts car 1979 300TD Auto - Parts car. 1985 300D Auto - Wrecked/Parts. ========================= "If you don't know where you are going, any road will get you there". Lewis Carrol |
#10
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bigrichard,
I'm a little confused. You say you don't operate it in traffic because you don't know if the fan comes on. You won't KNOW if the fan is coming on UNTIL you are in traffic conditions. It only comes on in the event of excessive high side pressure in order to prevent damage to the a/c system. In a mild climate (since you choose not to list your location I have no idea what your climate is) it would be possible for a properly working aux fan system to live its life without ever coming on. Go to the high pressure switch at the r/d, disconnect and short the pins on the connector to see if it comes on. If not the problem is with the wiring between there and the fan. If it does, and the fan still does not come on at the specified high side pressure, then the high pressure switch is bad. BTW, I don't remember which one, but I think that it is the high pressure switch that is actually a temperature switch. In the a/c system pressure is indicated by temperature, so they use a temp switch to sense excessive high side pressure. Good luck, |
#11
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Quote:
No relay No fan. danny
__________________
1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#12
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Quote:
__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto 1983 300D - parts car 1979 300TD Auto - Parts car. 1985 300D Auto - Wrecked/Parts. ========================= "If you don't know where you are going, any road will get you there". Lewis Carrol |
#13
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Quote:
__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto 1983 300D - parts car 1979 300TD Auto - Parts car. 1985 300D Auto - Wrecked/Parts. ========================= "If you don't know where you are going, any road will get you there". Lewis Carrol |
#14
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Update
I rechecked the high pressure switch by jumping the two wires and the fan does work. Apparently, I didn't have good contact the first time I tried to jump them.
So the next move is to replace the pressure switch, then I'll check out the intermittant compressor issue. Thanks all for your advice.
__________________
Make Biodiesel Not War '85 300TDT |
#15
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Whoa .....
I assume you know that the pressure switch replacement requires evacuating the refrigerant from the system ? But you did not mention it... so thought I would...for others ...
The Temperature switch on the R/D can be replaced without evacuating because it works on convection... no direct contact with refrigerant in system.... |
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