weired thing going on
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Elder User
Joined: Aug 2006
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weired thing going on
ok so it got HOT ysterday... and i am always driving with the ac on even if it is not hot and the fan on full blast...
but yesterday and today the fan seems like it is surgung.. going high low medum high hen low again and then staying low...iw wondering wtf is going on? .. fan resistor or something or alternator or ????
but yesterday and today the fan seems like it is surgung.. going high low medum high hen low again and then staying low...iw wondering wtf is going on? .. fan resistor or something or alternator or ????
Fleet Owner
Joined: Aug 2010
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From: Reynoldsburg, Ohio
Assuming this change of speed in the blower motor is somewhat intermittent it sounds like the blower motor itself is beginning to fail. An issue with the A/C system shouldn't affect the blower motor even if it was the refrigerant had leaked completely out.
Elder User
Joined: Mar 2014
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Hi timso1,
I've had both, evap icing up due to low freon and other times when the connector at the blower motor overheated with corrosion. For a time, the blower would not start, then randomly it would start working.
Check the connector under the hood first, unplug and look then replug it and test. If that ain't it, check pressures on freon. Another indication of icing the evap is a BIG puddle of water when sitting. All that ice melts and there's your answer. Another method, when the blower sags, switch to heat for 10 seconds then back to AC. If it's ice, it will melt quickly and the blower will take off again.
jim
I've had both, evap icing up due to low freon and other times when the connector at the blower motor overheated with corrosion. For a time, the blower would not start, then randomly it would start working.
Check the connector under the hood first, unplug and look then replug it and test. If that ain't it, check pressures on freon. Another indication of icing the evap is a BIG puddle of water when sitting. All that ice melts and there's your answer. Another method, when the blower sags, switch to heat for 10 seconds then back to AC. If it's ice, it will melt quickly and the blower will take off again.
jim
Fleet Mechanic
Joined: Oct 2012
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The blower motor in my '88 started surging and then would intermittently cut out. It was the wiring/plug to the blower motor. I cleaned up the plug and it worked well for a while (about 3 months) then it started again. I replaced the motor and found there was a wiring issue where the wires went into the old motor.
If it were icing up the blower RPM would not change, just the airflow would reduce and the air temp would not be nearly as cold.
If it were icing up the blower RPM would not change, just the airflow would reduce and the air temp would not be nearly as cold.
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Elder User
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i get water all the time under the van .... even way before this issue.. i will check the freon ..it should be good as when it does work it is cold.. im thinking its the stepper motor / blower motor having an issue .. it all started when i pulled out the sterio to look at something..i wonder if i loostned a conector ??
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Cargo Master
Joined: Apr 2013
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From: Central Florida
The other people here are steering you correctly. Icing up, or bad motor/resistors, or bad connector...
You have to isolate each possible theory and test it.
How old is your motor? Years/miles. If it's old: it's either bad or about to be bad. Replace it now (with new resistor).
Then move forward.
You have to isolate each possible theory and test it.
How old is your motor? Years/miles. If it's old: it's either bad or about to be bad. Replace it now (with new resistor).
Then move forward.
Fleet Owner
Joined: Aug 2010
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From: Reynoldsburg, Ohio
I've not seen too many vehicles where water is essentially flooding the upper part of the engine bay. Because most of the blower motor connectors and wiring is located higher than the intake manifold its unlikely rain or melting ice has caused this.
Long term exposure to the environment can/does allow a corrosion to form on higher amp draw connections so this could also be a factor should you find this to be the case on the resistor network connector.
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Elder User
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i put a new motor and resistor pack in today .. even a new wheel. $100 in parts .. everythigbn works nicely now .. i even pulled the radio out and checked the conectors to the switch .. i will assume the 250,000 original mile motor and resistor were dying lol
Elder User
Joined: Mar 2014
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There are springlock type connectors in the wiring harness to the motor. With the high current draw, extra heat from the engine area, and moisture (they aren't sealed) those connectors corrode and become resistive. My plastic connector in the harness had melted enough to let one of the connectors melt through the plastic.
Since the harness connector was for manufacturing only, I spliced the wires and eliminated the source of that problem. I'm still on the same motor, only had 106K on it when I sold it. :-)
jim
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