+ Reply to Thread
Results 1 to 11 of 11
Thread: Ice Storm Overheat
02-02-2011 08:53 AM #1
Ice Storm Overheat
Well- I just came in from looking at my coolant and oil and am hopefull that I have dodged a bullet. My 97 528 has been in need of an aux fan fix for awhile now as my attempts to fix it have not succeeded. I have been carefull to stay out of traffic and away from the drive-thru's. But yesterdays ice storm here in Ohio nearly got me. It was so bad on the roads that I never got going fast enough to cool the radiator and the light came on just before I reached my driveway. I have said my prayers and vowed to take it straight to my indy. Just thought Id warn everybody about how snow and ice can lead to overheating.
02-02-2011 10:32 AM #2
You need more than an aux fan
I don't mean to sound flippant, but the aux fan is not your only problem if what you say is true. As a matter of fact, it might be broken but it's probably not responsible for your recent overheats in any way.
First, in sub-freezing temperatures the E39 doesn't need any fans to stay cool. Just by having the hood open, no fans installed, no heat on, it can't get above 70C (I just did this on the weekend trying to bleed).
Second, the main fan, even when not engaged, provides more than enough airflow in these conditions to keep the engine cool. EVEN IF your main fan is failed freewheeling, it'll still move enough air to keep from overheating.
Third, add the heat sink effect from your cabin heater and the situation is even less precarious.
Does your cabin heat work solid or go cold from time to time? What is the condition of your thermostat and water pump? Does the gauge jump around, or smoothly change readings and gradually overheat? What happens if you turn the heat up to full (i.e. set for max temperature and max fan) when it starts to indicate an overheat?
I'd seriously place the aux fan aside in your mind and start checking other things. It's POSSIBLE that it could have kicked in to prevent an overheat depending on what else you've got going on, but the aux fan should not have even been necessary in these kinds of temperatures.
02-02-2011 10:41 AM #3
- Pembroke, MA, United StatesMember No: 4328
- Join Date
- Oct 2000
- Rep Power
Homer probably had ice&snow blocking the air flow
"Drive It Like You Stole It, A Sickness for Quickness"
The Bottle Rocket "King of Spray" 2 Stage Nitrous Oxide
Dare to be different and stand out among the crowd of me-to-cars!
No guts, no glory! Tire smoke, not traction control!
Zionsville all aluminum radiator to replace the 3 leak prone Nissens Radiators!
NOS Progressive 2 Stage Controller with port injection
Snow's Performance Methanol/Water Injection
Dinan downloads, VAC Under Drive Pulleys
Dinan Carbon Fiber CAI
Dinan Front Strut Bar
Electric Cooling Fan w/PWM controller
NGK Iridium Plugs
DDE Enhanced Angel Eyes, Smoked Lenses
Koni FSD's/H&R Springs, BAV Brass Caliper Bushings
Eisenmann Race Exhaust (from H8-Rain's car)
///M5 3.15 LSD
///M5 Sway Bars, Front & Rear
Energy Suspension Polyurethane Sway Bar Bushings
///M5 Gauge Cluster Rings ///M5 Lip Spoiler
///M5 Mirrors and Switches
Leather Z weighted shift knob (thanks H8-Rain)
Rogue “Octane” Short Shift kit w/WSR
Rogue Tranny Mounts
StopTech Brake Lines Front & Rear
Axxis Deluxe Plus pads Front & Rear
Staggered M Parallel 66, Xenons
Modified CDV, UGDO
Euro Storage Tray (thanks Zombywolf)
Redline in Diff and Tranny
Passport 8500 X50, Escort ZR3 Laser Jammer
G-Tech/Competition Pro Data Logger
Auto Enginuity OBD-II Scan Tool
25% Tint, X-Pel, LoJack
PIAA Driving Lights
BMW CCA Member Boston Chapter
02-02-2011 11:50 AM #4
02-02-2011 12:39 PM #5
02-02-2011 12:43 PM #6
Re: Yes-Other issues
Are you constantly getting air out of the system? Or do you bleed constantly but there isn't much of an air problem?
If there's not a lot of air in the system, maybe your water pump has issues. Maybe part of the impeller is even missing? Maybe you have a blockage somewhere preventing the easy flow of coolant. Or it could be the t-stat stuck open, I suppose, over cooling the engine with the radiator so you have no heat left.
The heater and the block are "inside" of the stat and with the exception of overcooling have no relation to the operation of the stat. If you were overheating and simultaneously not getting heat the other day - it's not just the stat.
If you are constantly getting air out of the system, it could be a head gasket issue but we'll all hope that it isn't that.
02-02-2011 11:49 PM #7
Re: Homer probably had ice&snow blocking the air flow
last week i was driving in the snow storm on the highway and after a while my headlights were worthless cause of all the snow buildup on the front. (hids=no heat) I pulled over on the shoulder to clean the headlights real quick and got stuck in some snow so i had to spin the tires for about 30-45 seconds (not constant) and i saw my temp start climbing past 110. At 114c the needle started moving, at 117c it was at the 3/4 line. I [Oops!] a brick and shut it off, i hit the rest button on the climate control and watched the temp drop sooo fast. Anyways i popped the hood and needless to say there was 0 airflow. Driving on the highway in snow clogs up all the air passages. The whole front of my car was wearing a mask of ice and snow. only the fogs lights were clear from their own heat. Headlight washer systems should of been standard on all cars with HIDS. I had to pull over every 10 mins to clean off the headlights.
86 325es (wrecked by careless driver)
87 325 300k (project for life)
00 540is 6spd 180k (daily driver)
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)