Bigmo5328

Having a couple issues with my 91 ls.....I recently replaced the blower motor due to the fact that my fan was not working...also had to replace the blower motor resistor because after replacing the motor all I had was high. My current issue I can not get the windshield to defrost properly. In all other cars I've driven I let the car warm up turn defrost on once the windshield is clear im good to go never have any issues again. In my ls I turn on the defrost setting and put it on the none recirc setting and the windshield barely clears up. Later on while I'm driving the fan seems to go into overdrive mode and kicks in and defrosts the window then turns off. Windshield fogs up again. Any ideas? Also driver side and passenger side window defrosts just enough I can see into the side mirrors. Second issue is leaking water on the passenger side. Its not as bad as it was before I replaced the blower moter but I'm still getting water dripping in. Did some googling seems one cause could be passenger side cowl leak? Any help would greatly appreciated. Also on a side note when I replaced the blower motor the new one I purchased didn't have the inset connector like the old one just two wires black and blue. I took apart the old one and ripped the connector out of there. What i didn't pay attention to was where to put what wire where both had positive signal on the motor itself so I thought I'd be ok. Could this be causing an issue?

Zaspher

Yeah you have a cowl leak, you should replace that ASAP as that's what caused your old blower motor to fail, water leaking on a electrical part. Also do you have hot air? Dont expect miracles from the you defroster I would just ice scrape for a minute.

fcm

It is a DC motor the only diff, it will make if wired "backwards" is motor would run backwards, [suck instead of blowing air].

Please explain, "Later on while I'm driving the fan seems to go into overdrive mode and kicks in and defrosts the window then turns off" does the blower motor stop working or just no air from defrost vents? 94

Bigmo5328

Yes I definitely have hot air now I had it before it just didn't come through into the car unless I was going faster then 45-50mph. I will definitely order the parts needed and fix that too.

Bigmo5328

Ok cool so that's no issue... It definitely is blowing the air through the car.... The air coming through the defrost vents is minimal. But sometimes when I'm driving I can hear it get louder and a little bit stronger and the window defrosts a little bit better. Also It seems to randomly want to kick in and actually switch to whatever setting I put it on. Just went outside and played with it for a bit every setting besides defrost setting blows strong air. Put it on defrost and its real weak. If I Rev the car up a bit and hold it or go driving the fan suddenly seems to go into fast mode when on defrost for a few and then cuts off. I do wonder if the system u have in my car could cause the issues with the blower acting up?

fcm

Then my guess is, mode control is not working, possibly problem, [electrical] with HVAC head, [heater control panel] the mode control motor itself or a mecanical problem with the mode levers, [defrost mode lever in particular]
#11... http://www.acuraautomotiveparts.org/...ystemcomp=List All&vinnoT=&trim=&trans=&view=normal

It may even be one of the doors not working properly.

Even though it does not look like anything big enough can get down the defrost vents, and into the heater unit, they do.

The problem is, to check you will need to pull the dash and heater box.

Lets hope it's something else.

I would start by checking the mode control motor and levers, you can do that by looking up from under the drivers side of the dash, all the above is on the left side of the heater unit.

Unplug the MCM and spray a little contact cleaner or penetrating oil, [WD40 will work] into both the plug and socket, plug it in and unplug it a few times to clean the connetions.

Make sure all levers move "correctly", nothing loose, bent, broken or disconnected.

All the above assumes that the blower motor is "weak", when in defrost mode, because of a restriction, [have you tried it with both fresh and recirculate] or air is redirected, [also coming out vents or floor].


If the blower motor actually slows down, you have a connection problem, blower motor speed has very little to do with engine RPM or car speed, a slight bit more voltage from the alt., but hardly noticeable.

Check if changing fan speed and back does anything.
Check heater fan speed switch ground, and heater control ground, [two black leads at heater control]. 94

Bigmo5328

Thanks for the information.... Today turned the car on left on defrost for about 30 mins.. Came back drove turned it to the front vents and all was good had no issues with it fogging up.... Got off work about an hour ago let the car warm up blew the defrost for about 10 minutes and then started driving no issues again. It blows air whether it's on no recirculation or recirculation mode but I feel like I get more heat in the car with the non recirculation mode.... I also do have an issue with my lights dimming and the fan speed slowing down when I slow down to a stop while driving.... Start driving lights get brighter and fan gets faster..... Any ideas on that? I was told I need to go ahead and replace or do the "big three" upgrade and I should be good. And do you have any links I can look at?

fcm

Fresh air will be cooler the recirc. , for obvious reason.

Unless you have added more load, there is no need to upgrade the grounds, [although it can't hurt].

Redoing the main grounds, [disconnect/clean/reconnect] is a good idea and a must on older cars, once the grounds are done take the car to a batt./alt. shop, [Interstate Batteries] and have the batt. and charging system checked, it will be a free test and only takes a few min. 94

Bigmo5328

1500 Watt system connected new battery and alternator replaced about two months ago... Had an issue with lights dimming so I purchased a bigger battery and a capacitor... Now the only issue I really have is it seems everything dims down when the ram drops.... and I have no ac... Ac compressor was bypassed when I purchased the car....