cooling system

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cooling system
Topic Started: Thu Jul 2, 2009 5:25 pm (166 Views)
protearose	Thu Jul 2, 2009 5:25 pm Post #1
Member Posts: 75 Group: Members Member #2,058 Joined: December 22, 2007	Hi. Cooling temperature climbs to 100 after 3 miles and stays there but doesnt boil?



Stempies	Thu Jul 2, 2009 5:30 pm Post #2
Hot Lips Posts: 3,305 Group: Members Member #2,380 Joined: March 6, 2008	Very hot weather may be a factor! Must admit mine still runs at 80* unless i hit heavy traffic!



mdavison	Thu Jul 2, 2009 8:05 pm Post #3
Undergraduate Student (BSc Mech Eng & Manufacturing) Posts: 195 Group: Members Member #3,534 Joined: November 23, 2008	Sound a bit warm, you might need to adjust the ratio of coolant/antifreeze to water.



algord83	Thu Jul 2, 2009 8:10 pm Post #4
Taller than shorter people Posts: 2,045 Group: Members Member #1,981 Joined: November 30, 2007	Mine has been climbing rapidly in traffic in this heat As soon as the fan kicks in, it starts to slowly cool off. However, If I give it a good revving in traffic with the fan on it cools very rapidly. .30 seconds or so at 3.5k does the trick Also revving when the fan is on is fun....sounds like a jet engine!....always gets attention in traffic Al



stwat	Thu Jul 2, 2009 10:40 pm Post #5
Moderator Posts: 12,367 Group: Moderator Member #28 Joined: November 11, 2005	Id change the thermostat. Does the fan never cut in? What engine is it? The 2.6 engines use a viscous fan while all other models have an electromagnetic fan which is controlled by a temp switch. Maybe you need a new fan switch. In any case, id say you need a new thermostat.



chrismatheou	Thu Jul 2, 2009 11:05 pm Post #6
Enthusiast Posts: 1,461 Group: Members Member #789 Joined: January 4, 2007	Both my 190's run at the correct temp. My 2.0litre used to creep up to 100 on a very hot day in traffic and come down to a max of ninety after the fan had kicked in. On my diesel after changing the waterpump & housing, new mercedes radiator and viscous fan the car still runs exactly as it did before the accident, thanks Matt That's the same temp of 82c all day long it hasn't ever budged from that in the last few steeming hot days whilst sat in a good few hours of London traffic



balamb37	Fri Jul 3, 2009 8:44 am Post #7
Member Posts: 560 Group: Members Member #3,881 Joined: February 25, 2009	I wouldn't worry too much over it, When I was in South Germany the temp. was always at around the 100 in summer where the outside temp was nearly always around the high 20s to 35, for the 190 there is two temp. Thermostats and also two temp Thermoswitches for the fan, whether that is the case here I don't know, and as long as you don't boil over you haven't a problem.



ML190E	Fri Jul 3, 2009 6:02 pm Post #8
Member Posts: 224 Group: Members Member #3,261 Joined: September 18, 2008	My 190 gets very hot in traffic too and i've never heard the fan cut in tbh i didnt think the fan was supposed to. Where are the fan switches located



balamb37	Fri Jul 3, 2009 8:07 pm Post #9
Member Posts: 560 Group: Members Member #3,881 Joined: February 25, 2009	Hi, The thermal switch that opperates the fan is in the top of the head, the front one with a plug on it with two connections in it. (depending on your model. I believe MB supply two different ones, with different opperating temperatures for switching the fan on. Cheers Barrie.



ML190E	Fri Jul 3, 2009 8:08 pm Post #10
Member Posts: 224 Group: Members Member #3,261 Joined: September 18, 2008	Cheers thanks for the info Barrie



balamb37	Fri Jul 3, 2009 8:13 pm Post #11
Member Posts: 560 Group: Members Member #3,881 Joined: February 25, 2009	With your ignition on, take the plug off and short the two connections in the plug and your fan should switch on if not then you have a problem in the power delivery somewhere.



protearose	Fri Jul 3, 2009 8:15 pm Post #12
Member Posts: 75 Group: Members Member #2,058 Joined: December 22, 2007	Thanks everyone. It doesnt boil so I wont worry. Maybe its a faulty gauge or temperature sender unit. I will see if it gets any worse.



EwanS	Mon Jul 6, 2009 6:53 am Post #13
Member Posts: 687 Group: Members Member #1,484 Joined: July 9, 2007	I ended up having to go on a rescue mission to collect friends from Wembley Stadium on saturday night, and the engine temperature gauge went up to 110 and higher when I got stuck in a traffic jam outside the event. Opened the bonnet to fit the "over-ride cable" onto the fan connector, but the fan had kicked in and was spinning really, really quickly. I ended up pulling over and abandoning the car with its bonnet up for half an hour to cool down before driving home again. So, how come this car despite the fan kicking in was still getting too hot? Its a 1991 1.8 manual with the electromagnet on the fan coupling. We changed the thermostat when we bought the car, should I change the switches too? Seemed a bit strange that despite the cooler temperature in the evening that it would get that hot in a traffic jam and not cool down when the fan kicked in. I should add, I had to replace the radiator last year when it overheated and blew a hole in the radiator and dumped its coolant all over the A3. That was in a traffic jam in November last year, so it wasn't exactly warm outside.



balamb37	Mon Jul 6, 2009 9:50 am Post #14
Member Posts: 560 Group: Members Member #3,881 Joined: February 25, 2009	Hi, They do tend to get a bit hot in standing traffic, but as long as your fan is kicking in all you need to do is rev it a bit and you should see the temp. fall, if not heater full on hot and speed with the windows wide open and when you get home check for the reasons why it failed, can be that someone has tipped a tin of 'radweld' or'barrs' in at sometime or another and somewhere a coolant chanel is blocked. But take into account that the temp. gauge could be over reading. Cheers Barrie. Edited by balamb37, Mon Jul 6, 2009 10:06 am.



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