AC/Heater Question
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Joined: Aug 2002
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From: Warner Robins GA
AC/Heater Question
Hey everyone,
It was pretty nasty out tonight, and my windshield was all fogged up when I got in the car. I tried out the defrost and it didn't really seem to do anything (first time I've tried it since I bought the car). I heard a slight hiss sound for a moment, but nothing came out of the vents.
Tried the heater, air conditioner, and everything and it all seemed to do the same thing. Now, I knew before that something was up with my A/C. I just put it off for now because the cooling weather lowered its priority. I figured my problem was a leak and I had lost all my coolant, so it wasn't kicking on. A call to a mechanic seemingly confirmed my suspicion.
Now however, I'm wondering if maybe my heater blower motor is bad. I know next to nothing about air conditioning systems, but I do know the main parts and what they do (for the most part). Would a bad blower motor cause nothing but a quiet hissing sound when AC or heater is engaged? By the way, I did confirm that the heater was getting warm by leaving the car off but the ignition engaged.
Any ideas, guys? If you think it's the blower motor, have any of you ever replaced this? Judging by the steps in my Haynes book, it doesn't look that hard. It can be decieving at times. I've checked all fuses.
Thanks much.
It was pretty nasty out tonight, and my windshield was all fogged up when I got in the car. I tried out the defrost and it didn't really seem to do anything (first time I've tried it since I bought the car). I heard a slight hiss sound for a moment, but nothing came out of the vents.
Tried the heater, air conditioner, and everything and it all seemed to do the same thing. Now, I knew before that something was up with my A/C. I just put it off for now because the cooling weather lowered its priority. I figured my problem was a leak and I had lost all my coolant, so it wasn't kicking on. A call to a mechanic seemingly confirmed my suspicion.
Now however, I'm wondering if maybe my heater blower motor is bad. I know next to nothing about air conditioning systems, but I do know the main parts and what they do (for the most part). Would a bad blower motor cause nothing but a quiet hissing sound when AC or heater is engaged? By the way, I did confirm that the heater was getting warm by leaving the car off but the ignition engaged.
Any ideas, guys? If you think it's the blower motor, have any of you ever replaced this? Judging by the steps in my Haynes book, it doesn't look that hard. It can be decieving at times. I've checked all fuses.
Thanks much.
Drifting
Joined: May 2001
Posts: 1,726
Likes: 1
From: COCOA Florida
Re: AC/Heater Question (Tourney3p0)
1 what year is the car
2 does the clutch on the compressor engage when you put the air on
3 is it electronic C68 or manual
post answers and we will see what help we can give. tom
2 does the clutch on the compressor engage when you put the air on
3 is it electronic C68 or manual
post answers and we will see what help we can give. tom
Drifting
Joined: Feb 2000
Posts: 1,994
Likes: 0
From: Charleston, WV
Re: AC/Heater Question (C4TOMCAT)
The hiss sound may have been the vacuum switch under the dash but it should have defaulted to defrost if that were the case. The blower motor is an easy job......... need more info though. :seeya
Thread Starter
Pro
Joined: Aug 2002
Posts: 715
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From: Warner Robins GA
Re: AC/Heater Question (C4TOMCAT)
1 what year is the car
2 does the clutch on the compressor engage when you put the air on
3 is it electronic C68 or manual
post answers and we will see what help we can give. tom
2 does the clutch on the compressor engage when you put the air on
3 is it electronic C68 or manual
post answers and we will see what help we can give. tom
1) Sorry, it's an 88. Originally wrote it out but must have removed it when I edited it for my poor wording.
2) The clutch engages alright.
3) It's a manual.
I was looking through the factory manual and saw that there's an under-hood fuse for the electric, and I don't have that.
I unplugged power from the motor and put a voltmeter on it. I didn't get a register on it, so assuming the voltmeter isn't toast, I guess it's more than likely not the motor. Should it have a constant 12 volts, even if it's switched to off? I turned on the ignition but not the car itself and turned on the heater. Same slight "hiss" sound but no air of any kind. That's when I checked the voltage and got nothing.
I suppose I could now try running a hot 12v wire to it to see if it turns on, but I think it may be a moot point since I don't seem to be getting voltage to it anyway.
Drifting
Joined: Feb 2000
Posts: 1,994
Likes: 0
From: Charleston, WV
Re: AC/Heater Question (Tourney3p0)
You get this hiss sound with the engine OFF?...... it's not vacuum then. If the motor runs at this point maybe you have a bunch of dirt inside the heater box up against the heater core or evaporator. Maybe the hiss is air coming through the dirt?....... :seeya
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Pro
Joined: Aug 2002
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From: Warner Robins GA
Re: AC/Heater Question (vettmech)
I suppose it could be dirt causing the hissing sound. Problem with that is though, it only does it for a second, like air escaping. I'm wondering if maybe I simply have a bad switch. From what I can tell, that'd cause me to get no volt reading at the motor as well. I don't think getting in there to test it would be a big deal. Now I just need to figure out how to test it..
