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Heater control issues. How hot?
Posted 15 December 2005 - 01:53 AM
I am on my way to the wreckers tomorrow to get a new heater push-button control as mine is physically broken. It was broken when I got the car. The "covers" are all missing and I just have small clear plastic buttons to push. After trial and error I have found what button does what. Since it's been cold, I don't get the heat I need. I'm used to driving an air cooled VW in the winter (scraping ice off the inside while driving!). So I really feel there actually is a heater problem here.
This is what it does:
The outside air vent (behind glove box) opens on every setting except vent. For it to close on vent, I have to hold the button while driving, the air is a good kind of warm then. On defrost, feet or mix the outside vent opens and when it's below 30f it just doesn't cut it (Chills!). I have unhooked the outside air vent motor and found without the fresh air it doesn't defrost worth a darn, so I hooked it back-up. The T-stat is new and does maintain 180 F, Core hoses are hot and correctly hooked up, the mixing linkage moves from one extreme to the other. This is the first water cooled car I've ever liked and it's real practical, but I expect more out of the heater. My wife gets to drive the nice newer cars and they will "Melt your face off!" if you let them. Even on the cold days! What's with the Soobie? How can I get the heater to crank? Thanks, Zorrro
Posted 15 December 2005 - 10:46 AM
The biggest thing stopping my heat was the cable on the temp adjuster. It was broke behind the dash. Since I did not have a replacement in the works I just grabbed the cable end and pulled it up to full heat. The next thing was my restore pack, but that was not a big deal I just have full fan and off.
You may also want a 192 tstat. That extra 10 deg. can make a difference in cold weather. You could even hold on to the old one to swap in for the summer.
Also if you are still having problems keeping warm you can put some card board in front of the radiator, only block about half of it. This will decrease you engine cooling thus increase the temp of the heater core.
Hope this helps!
Posted 15 December 2005 - 10:52 AM
If you have to hold the button in to get it to work, I would say it's definitely bad. If it were just a vacuum line disconnected, it wouldn't work even when you hold it in.
Although the hoses to and from the heater core are warm, you still may not be getting good heat transfer. That can be caused by a couple of things, scale buildup inside the core or damage or debris on the heater core fins. I would backflush the core by putting a garden hose on the outlet side of the core, if it's not too cold where you are. Also check for airflow across the core.
You also might want to go with a hotter thermostat, like FredRogers said. Those newer cars your wife is driving probably have 195 degree thermostats, because of fuel economy and emissions controls.
Posted 15 December 2005 - 09:46 PM
Posted 16 December 2005 - 01:45 AM
Posted 16 December 2005 - 11:29 AM
Posted 21 December 2005 - 03:34 PM
I thought I replied yesterday but didn't see this in the tread? This is what's going on so far:
I have flushed the heater core with vinegar and mouth pressure (Yuck!). I then flushed with water and mouth pressure until all vinegar was gone. It was too cold to get a hose de-iced and I didn't feel like defrosting one in the house. I re-hooked the heater core up, filled and burped the cooling system. I also replaced my broken controls, it is real nice to have buttons that work! I have put a few hundred miles on it and the heat is only slightly improved. Max A/C is the only way I get any "good" heat out of it. Driving is a back and forth effort of driving on max A/C (no outside air) and switching back to defrost when the window fogs and so on. I expect the heater to keep the cock-pit warm in defrost. Every other car seems to do this? At the moment I'm planning a day to dismantle the dash and replace the core (just because I'm there). During that process I will be looking for air leaks and damper problems. At the moment, all the 3 actuators work and seem to direct air where they are supposed to. The heater hoses are hot with one that I can squeeze and maintain a good poker face. The other is too hot to squeeze for very long. The engine temperature does not change when heater is on either. I would expect in this cool weather that the core would provide enough cooling to keep engine at 180F when at idle. It still warms up to cooling fan temp when heater on full and car at idle. As long as your driving a 3mph or so temp stays at 180F. I'm pretty sure the core is not rejecting as it should. Either because of internal scaling or bypassing air. If hoses were cold at the core and warm at the block I would expect a plugged core. If one hose was hot and the other cool I would expect low water flow. If one was hot and the other warm I would expect normal operation and mine both being hot I would expect poor heat transfer. Any input before I devote a day to dash dismantling would be helpful. Thanks, Zorrro
Posted 22 December 2005 - 03:16 AM
As far as pulling the dash goes, the EA-82 dash is way easier than the EA-81's are. I've pulled both... Moosens has a write-up floating around on here on pulling the dash out of the EA-82 vehicles. The '86 Sedan I have sitting in the garage has a mouse nest sitting right on top of the heater box, could possibly have caused some issues there. There's also one in he fresh air intake under the wiper cowl on the driver side. Pesky little varmits anyways.....
FYI; A properly working heater system doesn't have enough cooling capacity to keep the engine at the "normal" area of the temp gauge, usually the half way mark, it will heat up enough to have the cooling fan come on. Yes, you can use the heater to help cool an over-heating engine, but it's not enough in itself to do a proper job alone.
Posted 22 December 2005 - 04:31 AM
"There's also one in the fresh air intake under the wiper cowl on the driver side. Pesky little varmits anyways....."
Are you saying there is more outside air intakes than the one behind the dash? If so, I'm looking there! I have a mice problem too. We have a modern full size truck I don't drive, cause of the 11mpg deterent. Anyway the mice moved into that and shredded the insulation on the fire wall. Nuke em!!!!!!!
Posted 22 December 2005 - 05:12 AM
I have the dash out of the Sedan, as I'm stripping it down for parts. I took pics of the backside of the dash, and of the heater system as it's mounted in the car. I could get a few more detailed pics of the heater control system, door actuators and such and send them to you in an email if you like. Could try to do that tonight or tomorrow. Let me know....
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