Date registered: Feb 2006
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79 300sd overheating in 20F weather
While driving to work this am, I noticed that my temp. guage was jumping around and reading high (just under 250F ) most of the time. Pulled over, added coolant / water (the plastic tank was empty) and noticed that the black box closer to the firewall (heat exchanger? mono valve? ) was letting out steam and had a small puddle under it.
The heater worked GREAT 1 second and blew cold the next.
Can anyone tell me what this part is? Can send pic's if needed.
Also, what is the repair procedure?
Thanks a million!