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Car Heater causing window fogging

post #1 of 26
Thread Starter 
Anyone know why a windshield would start fogging up when using the heater in a car? It just started happening on my mothers car a year ago. She also says that there is kind of a fishy smell too.
Any ideas?
I tried using a window cleaner that is supposed to prevent fogging but it didnt work.
post #2 of 26
um...ever hear of the defroster? use it
post #3 of 26
Isn't it just simple condensation? If one side of the windshield is a lot colder than the other, you'll get condensation -- water comes out of the air and collects on the surface. If you're ever with a girl in the car at night, you'll see this phenomenon. Use the defroster to blow the same temperature air on both sides of the windshield so it doesn't happen (as much).

As for the fishy smell -- maybe some sort of oil issue?!
post #4 of 26
clean the windshield interiors with a cleaning agent.
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post #5 of 26
Kickaha and Amorph couldn't moderate themselves out of a paper bag. Abdicate responsibility and succumb to idiocy. Two years of letting a member make personal attacks against others, then stepping aside when someone won't put up with it. Not only that but go ahead and shut down my posting priviledges but not the one making the attacks. Not even the common decency to abide by their warning (afer three days of absorbing personal attacks with no mods in sight), just shut my posting down and then say it might happen later if a certian line is crossed. Bullshit flag is flying, I won't abide by lying and coddling of liars who go off-site, create accounts differing in a single letter from my handle with the express purpose to decieve and then claim here that I did it. Everyone be warned, kim kap sol is a lying, deceitful poster.

Now I guess they should have banned me rather than just shut off posting priviledges, because kickaha and Amorph definitely aren't going to like being called to task when they thought they had it all ignored *cough* *cough* I mean under control. Just a couple o' tools.

Don't worry, as soon as my work resetting my posts is done I'll disappear forever.
post #6 of 26
Kickaha and Amorph couldn't moderate themselves out of a paper bag. Abdicate responsibility and succumb to idiocy. Two years of letting a member make personal attacks against others, then stepping aside when someone won't put up with it. Not only that but go ahead and shut down my posting priviledges but not the one making the attacks. Not even the common decency to abide by their warning (afer three days of absorbing personal attacks with no mods in sight), just shut my posting down and then say it might happen later if a certian line is crossed. Bullshit flag is flying, I won't abide by lying and coddling of liars who go off-site, create accounts differing in a single letter from my handle with the express purpose to decieve and then claim here that I did it. Everyone be warned, kim kap sol is a lying, deceitful poster.

Now I guess they should have banned me rather than just shut off posting priviledges, because kickaha and Amorph definitely aren't going to like being called to task when they thought they had it all ignored *cough* *cough* I mean under control. Just a couple o' tools.

Don't worry, as soon as my work resetting my posts is done I'll disappear forever.
post #7 of 26
Switching the air source to outside air should help.
post #8 of 26
Turn the air conditioner on when defogging.
post #9 of 26
I work in the radiator industry. You probably have a leak in the heater core.
To make sure
1. Is there an odor of coolant from the vent.
2. There may be coolant leaking on either the floor mats, or there may be a drain on the engine side of the firewall.
3. A rad shop has equipment to pressurise your coolant system. If there is a leak anywhere this will find it.

Good Luck
post #10 of 26
Quote:
Originally posted by Scott
Turn the air conditioner on when defogging.

Most AC systems run the compresser during defrost independent of the outside air temperature. This is done to dry the air to make the defrost operation more efficent.
post #11 of 26
Thread Starter 
Quote:
Originally posted by AirSluf
Clean out and dry the defroster ducting. It has some stale funky water in it, so when you turn on the defroster you send hot extra-humid air straight onto a cold windscreen and it condenses instantly and won't go away until you physically heat the glass enough to dry it. You also need to find and seal the leak so the water won't get back in.

I have a similar problem in my old 911 whenever I go thru a deep enough puddle. But that's because of where the heater air intake is. It gets hot enough to dry out the ducts really fast, but it still leaves a couple minutes before the windscreen clears up.

I will try this, thanks
post #12 of 26
Thread Starter 
Quote:
Originally posted by applenut
um...ever hear of the defroster? use it

I believe the correct response to this is.............duh
She is blowing the defroster on high, this only started happening last year.
Weather is cold outside, she turns on the heater and the windshield fogs like crazy. I can see a little fogging, but the heater is plenty hot and there shouldnt be that much fogging.
post #13 of 26
Thread Starter 
Quote:
Originally posted by Ra
Switching the air source to outside air should help.

That was my first suggestion to her. Would you believe this car has no way to change this? Its a 1987 Chevy Celebrity and there is no fresh air/recirc switch.
post #14 of 26
Thread Starter 
Quote:
Originally posted by ROFF
I work in the radiator industry. You probably have a leak in the heater core.
To make sure
1. Is there an odor of coolant from the vent.
2. There may be coolant leaking on either the floor mats, or there may be a drain on the engine side of the firewall.
3. A rad shop has equipment to pressurise your coolant system. If there is a leak anywhere this will find it.

Good Luck

I believe thats what her mechanic suggested to her, but he wasnt sure and she didnt want to pump too much money into such an old car unless this was a sure fix. I will have her go for a second opinion. Thanks
post #15 of 26
Quote:
Originally posted by steve666
I believe the correct response to this is.............duh
She is blowing the defroster on high, this only started happening last year.
Weather is cold outside, she turns on the heater and the windshield fogs like crazy. I can see a little fogging, but the heater is plenty hot and there shouldnt be that much fogging.

well you said when you put the heater on. not the defroster. sometimes solutions are pretty simple.

duh.
post #16 of 26
Thread Starter 
Quote:
Originally posted by applenut
well you said when you put the heater on. not the defroster. sometimes solutions are pretty simple.

duh.

OKOK, dont get your panties in a bunch
post #17 of 26
Quote:
Originally posted by steve666
OKOK, dont get your panties in a bunch

plus, you're foreign.... you have been confused about stranger/more obvious things in america
post #18 of 26
Thread Starter 
Quote:
Originally posted by applenut
plus, you're foreign.... you have been confused about stranger/more obvious things in america

foreign? where do you think Im from?
post #19 of 26
Quote:
Originally posted by steve666
Anyone know why a windshield would start fogging up when using the heater in a car? It just started happening on my mothers car a year ago. She also says that there is kind of a fishy smell too.
Any ideas?
I tried using a window cleaner that is supposed to prevent fogging but it didnt work.

Have you mechanic look at your heater-core. I had the exact same problem with my old Bronco II. The heater-core is underneath your dashboard and would be causing this problem. The fogging isn't air, its actually antifreeze, thus explaining your weird smell. My repair bill was around $100. Good luck.

Dave
post #20 of 26
Thread Starter 
Quote:
Originally posted by Dave K.
Have you mechanic look at your heater-core. I had the exact same problem with my old Bronco II. The heater-core is underneath your dashboard and would be causing this problem. The fogging isn't air, its actually antifreeze, thus explaining your weird smell. My repair bill was around $100. Good luck.

Dave

Dave, if the repair comes out to only $100 my mother will be ecstatic!
post #21 of 26
Quote:
Originally posted by steve666
foreign? where do you think Im from?

nowhere apparently
post #22 of 26
Yeah, I had a similar problem...bad heater core. Except that after a couple of days mine blew right into the passenger footwell. (Pontiac 3000 station wagon...stupid car) Hot boiling coolant. Wish somebody had told me what it was before that happened.
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post #23 of 26
Thread Starter 
Quote:
Originally posted by benzene
Yeah, I had a similar problem...bad heater core. Except that after a couple of days mine blew right into the passenger footwell. (Pontiac 3000 station wagon...stupid car) Hot boiling coolant. Wish somebody had told me what it was before that happened.

Yep, looks like thats what it is. i just rubbed my hand all over the passenger side floor mat and entire area, and on the back of my hand is a spot of antifreeze. I told her to get it fixed pronto and to mention to them that it cost soemone here only around $100.

I dont trust her mechanic and expect him to try and rip her off.
post #24 of 26
Quote:
Originally posted by benzene
Yeah, I had a similar problem...bad heater core. Except that after a couple of days mine blew right into the passenger footwell. (Pontiac 3000 station wagon...stupid car) Hot boiling coolant. Wish somebody had told me what it was before that happened.

I hope the bill will come to as little as $100, it could be more
In some later Loncolns the book time is 11 hours to replace the heater core. You start by removing the seats, center console, and then work up into the dash. Some cars require the draining the freon from the AC system. I have had to remove the complete dash in about 1/4 of the cars I worked on.

Good luck
post #25 of 26
take it into a dealer
post #26 of 26
Thread Starter 
oh boy, if its that big a job and its expensive, its going to be time for her to buy a new car. She was going to buy a new car sometime next year anyway.

Now, what to get? She likes Chevys, Im thinking an Impala or Malibu I have the GM card and about $1700 to use towards a new car which i will give to her.

I also considered Suzuki Verona or Forenza but they have those stupid shiftgate auto transimissions and she has carpal tunnel in her hands and that would be a pain for her to shift.
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