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Searched around, lots of HVAC related posts. My E55 this winter has been exhibiting a symptom where the heat blasts quite hot, then it blasts cool, then hot, then cool. This seems to be a newer symptom, but hard to really say.
I read somewhere that this could be the interior temperature sensor, of which there is one near the ignition key, and frequently reference is one at the top dome. I tried the tissue test up around there but nothing stuck, but the ignition grille did hold the tissue. With the automatic systems taking all this input, not sure if anyone has had these exact symptoms in the winter. I can probably pop out that sensor to clean, but any other rundown of diagnostics I should look for?
Anyone have the part numbers for the sensor on the top dome? If that is indeed the issue.
Last edited by obiwantoby; Feb 12, 2022 at 04:32 PM.
Searched around, lots of HVAC related posts. My E55 this winter has been exhibiting a symptom where the heat blasts quite hot, then it blasts cool, then hot, then cool. This seems to be a newer symptom, but hard to really say.
I read somewhere that this could be the interior temperature sensor, of which there is one near the ignition key, and frequently reference is one at the top dome. I tried the tissue test up around there but nothing stuck, but the ignition grille did hold the tissue. With the automatic systems taking all this input, not sure if anyone has had these exact symptoms in the winter. I can probably pop out that sensor to clean, but any other rundown of diagnostics I should look for?
Anyone have the part numbers for the sensor on the top dome? If that is indeed the issue.
Always start by asking yourself 3 questions: what is my year, mileage, and common wear-out parts that can be attributed to this problem. So, thermostat, then heater control valve. Not likely to be an electric component when a mechanical component with a life span can go first.
Always start by asking yourself 3 questions: what is my year, mileage, and common wear-out parts that can be attributed to this problem. So, thermostat, then heater control valve. Not likely to be an electric component when a mechanical component with a life span can go first.
Well I found the sensor up top was broken. The thermistor wire broke. Will solder on a 10k ohm thermistor this week.
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