 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / BMW Cars / April 2007E30 cooling system question...
Will the lack of a thermostat make much difference in the cooling capacity of the radiator? I removed the thermostat months ago due to a cooling problem (which I believe turned out to be a bad viscous fan coupling) but the car still gets too hot. I have noticed that as the temperature climbs, revving the motor a bit causes it to come back down. This is obviously due to water moving through the radiator. Will replacing the thermostat solve this? I live in Florida so the need for a thermostat is questionable as far as most people are concerned... >Will the lack of a thermostat make much difference in the cooling >capacity of the radiator? No. Actually, it might be improved. >I removed the thermostat months ago due to a >cooling problem (which I believe turned out to be a bad viscous fan >coupling) but the car still gets too hot. Are all of the fan blades intact? The blades on my E30 started falling off, and one actual broke the top hose connection on the radiator on it's way out! >I have noticed that as the >temperature climbs, revving the motor a bit causes it to come back >down. I've always found my E30 320i to be a bit marginal on cooling. If I'm stuck in traffic I find that running the engine at 2300rpm really cools the engine down. This is because the viscous clutch drops the fan at about 2500rpm. Having said that, my 320i has never actually boiled over after 8 years of daily use in all weathers! >This is obviously due to water moving through the radiator. Will >replacing the thermostat solve this? No. Your problem lies elsewhere. Is you water pump shifting a sufficient volume? Is your rad blocked with bugs? Al. >>Will the lack of a thermostat make much difference in the cooling >>capacity of the radiator? > >No. Actually, it might be improved. This is what I thought but... >>I removed the thermostat months ago due to a >>cooling problem (which I believe turned out to be a bad viscous fan [quoted text clipped - 3 lines] >and one actual broke the top hose connection on the radiator on it's way >out! Actually, I was having multiple problems with the mechanical fan so I fitted and electrical fan to the radiator itself. This is a 325i but it should make no difference as compared to your 320. >>I have noticed that as the >>temperature climbs, revving the motor a bit causes it to come back [quoted text clipped - 6 lines] >Having said that, my 320i has never actually boiled over after 8 years of >daily use in all weathers! Someone had suggested that the thermostat opening actually restricted another passage in the thermostat housing and that caused the water flow to pass more through the radiator. I know it's a weird a.s housing and I haven't looked to see if this could possibly be the case (my son is driving mine while his in at the body shop). >>This is obviously due to water moving through the radiator. Will >>replacing the thermostat solve this? > >No. Your problem lies elsewhere. Is you water pump shifting a sufficient >volume? Is your rad blocked with bugs? Not to the best of my knowledge. I cleaned it out a few months ago and it hasn't been bug season yet. The water pump is new, the old one was questionable and seeing as they aren't expensive I replaced it. When the car is moving, it cools just fine although I have noticed that extended high speed driving tends to run it warmer than normal when it didn't use to. There's got to be an easy explanation for this and I'd really like to find it. Watching the temp guage is getting old... > Will the lack of a thermostat make much difference in the cooling >capacity of the radiator? I removed the thermostat months ago due to a [quoted text clipped - 4 lines] >replacing the thermostat solve this? I live in Florida so the need for >a thermostat is questionable as far as most people are concerned... The thermostat is not only there to control the temperature but to also restrict the flow of the coolant. Why? Well if the coolant does not stay in contact with the cavities in the cylinder head around the valve seats, stems, combustion chambers etc. then these could overheat or be over cooled - both are very detrimental to the safe running of the engine. Years ago when Mini Coopers were being races it was necessary to fit restriction plates if the thermostat was removed as the valves would seize and the heads crack around no 2 cyl (Cooper S had an extra head bolt in this area). The thermostat has NOTHING to do with the cooling or heat radiation of the Radiator only the coolant temperature circulating (or not). It you must have a cooler engine then fit a cooler thermostat or get a larger radiator if the one you have isn't keeping it at the correct temperature. Remember the radiator/thermostat is there to get the engine to the correct operating temperature and keep it there not to cool it down. > The thermostat is not only there to control the temperature but to also restrict > the flow of the coolant. Why? Well if the coolant does not stay in contact > with the cavities in the cylinder head around the valve seats, stems, combustion > chambers etc. then these could overheat or be over cooled - both are very > detrimental to the safe running of the engine. Hahah. Good one. Do you actually know anything about this? Those over cooled valve seats are a bitch.  Signature-Fred W >> The thermostat is not only there to control the temperature but to also restrict >> the flow of the coolant. Why? Well if the coolant does not stay in contact [quoted text clipped - 3 lines] > >Hahah. Good one. Do you actually know anything about this? Sarcastic bugger --- YES I BLOODY WELL DO! >Those over cooled valve seats are a bitch. > Will the lack of a thermostat make much difference in the cooling > capacity of the radiator? I removed the thermostat months ago due to a [quoted text clipped - 4 lines] > replacing the thermostat solve this? I live in Florida so the need for > a thermostat is questionable as far as most people are concerned... If you ever lose coolant I'd suspect the head gasket. Doesn't the US model (I'm guessing you have aircon) have a two speed electric fan? I'd check it's working OK. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price Don't appear to lose coolant. Until my son sat in a drive through last night and it got hot enough to blow a weak gasket on the throttle body heater (fixed today with home cut gasket), I haven't had to add coolant since I changed it several months ago. I keep an eye on it and don't allow it to get that hot. >> Will the lack of a thermostat make much difference in the cooling >> capacity of the radiator? I removed the thermostat months ago due to a [quoted text clipped - 9 lines] >Doesn't the US model (I'm guessing you have aircon) have a two speed >electric fan? I'd check it's working OK. >Don't appear to lose coolant. Until my son sat in a drive through last >night and it got hot enough to blow a weak gasket on the throttle body >heater (fixed today with home cut gasket), I haven't had to add >coolant since I changed it several months ago. I keep an eye on it and >don't allow it to get that hot. Oh DIY - use porridge to seal any rad leaks and drive it to the wrecking yard. >>> Will the lack of a thermostat make much difference in the cooling >>> capacity of the radiator? I removed the thermostat months ago due to a [quoted text clipped - 9 lines] >>Doesn't the US model (I'm guessing you have aircon) have a two speed >>electric fan? I'd check it's working OK. >>Don't appear to lose coolant. Until my son sat in a drive through last >>night and it got hot enough to blow a weak gasket on the throttle body [quoted text clipped - 3 lines] > >Oh DIY - use porridge to seal any rad leaks and drive it to the wrecking yard. If I were going to send it to the wrecking yard, I wouldn't be trying to fix it a.shole. Thank you for your completely idiotic input. It's too bad that the internet has no pre-use qualifications as your input would most likely not be here if it did. >>>> Will the lack of a thermostat make much difference in the cooling >>>> capacity of the radiator? I removed the thermostat months ago due to a [quoted text clipped - 9 lines] >>>Doesn't the US model (I'm guessing you have aircon) have a two speed >>>electric fan? I'd check it's working OK. > Don't appear to lose coolant. Until my son sat in a drive through last > night and it got hot enough to blow a weak gasket on the throttle body > heater (fixed today with home cut gasket), I haven't had to add > coolant since I changed it several months ago. I keep an eye on it and > don't allow it to get that hot. I assume you really do have coolant (anti-freeze) in it, not just water. >> Don't appear to lose coolant. Until my son sat in a drive through last >> night and it got hot enough to blow a weak gasket on the throttle body [quoted text clipped - 3 lines] > >I assume you really do have coolant (anti-freeze) in it, not just water. Yes, it has a mixture (although right now I can't say it's 50/50). Will be correcting the mixture as soon as I can track this down and fix. I had the exact problem as you do few weeks ago with my E30/325i. The Issus was one of the stud was broken in Valve Cover. I have the Valve Cover Gasket replaced, the temperature problem solved. However, I am suffering a new problem now, well, this is different story. "Psycho" <psycho@tbcia.net> ¼¶¼g©ó¶l¥ó·s»D:go8n23dnhhue3v25pngcpog5lqg5v6pg8g@4ax.com... > Will the lack of a thermostat make much difference in the cooling > capacity of the radiator? I removed the thermostat months ago due to a [quoted text clipped - 4 lines] > replacing the thermostat solve this? I live in Florida so the need for > a thermostat is questionable as far as most people are concerned... |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.