W124

A/c and Heater '83 300SD

I've seen this question on here before. But I never saw the fix. I turn on my AC or heater on low fan speed it works just fine. But if your hot or cold and turn the fan to high speed it runs fine for abuot three mins.Then it's off for about 1 min. on for 5 secs. off for 5 secs. it dose this for about 5 mins. then it will run for about 1 1/2 mins. and starts this all over again. It also dose a screeching sound under the dash on and off too with the no and off. Is there a hight limit on the fan or somthing? Thank for any help the weather is starting to heat up

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'87 300DT - When To Replace Primer Pump?

I have an '87 300DT sedan, 603.960 engine, 143500 miles. Reading thru my electronic copy of the W124 Service Library concerning the fuel primer pump, it lists the minimum pressures it should be able to achieve at idle and at a certain rpm. Measured at the supply line between the cartridge fuel filter and the inlet to the injection pump, doing the conversion from bar to psi, it looks to indicate that the primer pump should obtain a minimum pressure of 4 1/2 psi at idle. I have an underhood fuel pressure gauge installed (Mr Gasket 15 psi from Advance Auto) in the line specified in the FSM. Initially idling cold, it registers 6 psi. After driving 20 miles to work, idling when hot it registers 5 psi.

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Door Locks 93 300D 2.5

After locking my doors with the key all four lock knobs pop open on there own after about 45-60 sec. I can hear a wirring sound comming from the back seat. I am assuming I have a vacuum leak somewhere or a malfunctioned pump under the back seat. Could the door vacuum actuators be faulty? I am trying to keep this simple at first before I need to take the door panels off. Thanks for your help Mike Stillwater, Minnesota

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'87 300DT with coolant, oil pressure, and fuel guage malfunction

Hi: I have an '87 300DT with the 124 chassis. Has been running fine. The problem: the gauges for the coolant, oil pressure, and fuel all dropped to zero. The combination relay (part 201 821 00 47) is vibrating and making noise. Replaced the relay with the identical part with no improvement. Fuses are all good. I am about to test the sender units for the above guages. Any ideas? Thanks much, Pat

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