My A/C & heat- wont turn off. In Manual I cannot adjust the fan speed. The temp does change to the setting and when I push the off button it beeps, the display turns off, but just goes into automatic mode and keeps blowing at the temp it was set to. Any Ideas?
Re: My A/C & heat- wont turn off. In Manual I cannot...
Go to salvage and get a new used ac head to see if this helps .the head will become corroed at the connections in side ,i have taken them apart to see if i could clean them up with electric cleaner...
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If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.
manual AC you set fan speed etc, auto you just set the temp where you want it and the fan will automatically adjust it's speed to maintain the temp you selected, it also automatically goes from recirculate to fresh air.
i am familiar with the car and the problem . the best thing to do is go to the local parts store and ask for an adjustable thermostat fan switch its about 40 dollars you wire it to the battery the fan and a ground mount it near the battery start the car and adjust the knob to the desired fan turn on temp . to fix the setup you have there is a fan turn on temp switch on the passenger side head toward the rear should have one wire on it that grounds the relay on the radiator support . 87 should have one fan one relay sometimes the relay burns and melts the plug you have to buy a replacement plug from a parts store along with a relay so to test it ground the sensor wire with the key on and fan should turn on if it does that's the problem you could also buy a low temp one from summit racing.com the fan will turn on sooner if it still wont turn on the relay is the next culprit check if you have power and a ground with key on at relay plug if you do the relay is bad change it . hope this helps
when it's on 'auto', the fan adjusts according to the temp in the car and the temp setting you have it set at. try setting the auto temp control down to 65, then hit the "-" one more time to send it to "LO" - the fan should automatically jump up to max.
will it sounds like u tryed everything except what could be cousing the problem it is probley the heater core is pluged with hard water or calcium build up or is just pluged and a rad flush wont flush the heater core unless you start the vechial and flushing the rad to do the heaterd core to turn on the heat to high and the fasters fan speed and make shore the van is running.
Blower motor control module probably , but without testing that's just a guess . Do you know how to do automotive electrical testing ? Testing B+ to the module ? Do you know where the module is ? You can find a wiring diagram here , http://www.bbbind.com/free_tsb.html There is a fuse for the blower motor in the I/P fuse box , HVAC blower 10amp ,
For the dash display, if you're finding it to be intermittent, where it lights up sometimes and other times it doesn't, or if you have the driver information center that displays all kinds of info, but it's missing pixels, this is a common failure. The only fix is to buy another one, and they're very expensive (around $700).
As for the heater, turn on the system by hitting Auto or one of the fan speed buttons. Use the + and - buttons below the temp display to change the temp setting. If the heat doesn't heat up very well, you may have either a thermostat stuck open, or a failed heater core.
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