Heating issue
03-09-2016, 09:14 PM
#1
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300SEL 1990
Heating issue
Hi folks,
Practically no heat, which is not to say none, but almost none. If I stop the fan for a couple of minutes, the heat builds up somehow. But as soon as I start the fan, I get a momentary blast of decent heat but then it soon cools down to nothing.
I replaced the mono valve. Things only got colder. So I pulled out the mono valve, put it back again and removed its power leads. No effect. Then, even though the temperature gauge showed a steady 82F temperature, I changed the thermostat to an 87F model. Made sure that coolant level was topped up. No effect.
I'm at a loss. Does anyone have any ideas? Thanks!
Practically no heat, which is not to say none, but almost none. If I stop the fan for a couple of minutes, the heat builds up somehow. But as soon as I start the fan, I get a momentary blast of decent heat but then it soon cools down to nothing.
I replaced the mono valve. Things only got colder. So I pulled out the mono valve, put it back again and removed its power leads. No effect. Then, even though the temperature gauge showed a steady 82F temperature, I changed the thermostat to an 87F model. Made sure that coolant level was topped up. No effect.
I'm at a loss. Does anyone have any ideas? Thanks!
04-27-2016, 01:07 AM
#2
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Join Date: Apr 2016
Location: San Jose, CA
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w201,w124,w126
Was it like this when you bought it or has it slowly happened? I believe some cars had a axillary water pump for the heater. Might want to look into that. Sorry, I don't know much about the 300SEL.
