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#1
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Brrrr......Heat is no longer hot.
In my 420, the air coming out of the heater is no longer hot when going down the highway (over 60 mph). I look at the water temperature gauge and it reads 60 C. When I drive around town it will go to about 65F and eventually 70-75F if I drive for a long time around town. It will go back to 60F if I go back on the highway.
When I turn the car off, and say go to the store for 15 min and when I come back into the car, and turn it back on, the air is hot, but just until I go > 60 mph again. The air has a better chance of staying warmer (but not hot) longer if I drive at <50 mph around town and in traffic. It absolutely turns unwarm when >60. I have a few theories. 1 - Bad thermostat? 60 C seams pretty cold for the water temperature. I thought it should run between 80 to 100F? 2 - Bad water/heater controller valve? I do not know what you call it, but I think there is some kind of valve that can go bad, get stuck or something and that can cause hot water not to flow properly (Not sure). 3 - Bad electronic controller? Unlikely, but thought I would throw it in because you never know. I checked and replaced the fuse anyway. Any thoughts? I am thinking it is #1 or #2. I drove up north and froze my @#$@#$%@# off. Brrrrrrr |
#2
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sounds like thermostat, remove and replace, see what happens. cheap and easy fix.
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1995 MB E320 Wagon 2001 BMW 530i 2007 MINI Cooper S (!) |
#3
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I would agree that a new thermostat, and more likely, the monovalve repair kit will solve your problem...
Jay..
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89 300SEL Money Pit 92 Blown Buick Ultra Pimpmobile 220K and adding 1K per week 88 Wagoneer Slightly modified (Not for soccer moms) 04 Kia Sedona with every option... NICE |
#4
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aux water pump ?
__________________
1994 E500 (MY SUNDAY DRIVER) 1993 190E SPORTLINE LE W/ M104 SWAP 1997 C230 2002 ML320 2000 BMW 528I (WIFEY'S CAR) "Excuses are crutches for the unfounded." |
#5
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Thanks guys. Will get thermostate ASAP.
What is the monovalve? What is involved in the "monovalve repair kit?" |
#6
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Quote:
__________________
89 300SEL Money Pit 92 Blown Buick Ultra Pimpmobile 220K and adding 1K per week 88 Wagoneer Slightly modified (Not for soccer moms) 04 Kia Sedona with every option... NICE |
#7
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I had the exact same problem. -Engine temp 60 C. and penguins running around in the cabin.
I replaced the thermostat and my engine temp. went up to 85-90 C. and i can now toast a loaf of bread on the dashboard. $15 and ten minutes of work. Do it! Freestyler
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Never criticize someone until you've walked a mile in his shoes. That way, when you do, you're a mile away -and you have his shoes! '86 300E optically converted to '95 E300 (Sold) -Blauschwarz on silver -Black leather -17" AMG & 15" AMG for winter |
#8
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Just to make sure, to replace the thermostat, do I also need to buy a new gasket? If I have to buy a new gasket, is there a special adhesive I need to apply as well?
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#9
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Quote:
Unscrew the three bolts..Pull he housing off.. Pull the o-ring off.. Pull the old thermostat out.. Put the new one in in the same direction as the old one.. Install new o-ring.. Yada Yada Yada. Don't break the bolts when you re-tighten.
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89 300SEL Money Pit 92 Blown Buick Ultra Pimpmobile 220K and adding 1K per week 88 Wagoneer Slightly modified (Not for soccer moms) 04 Kia Sedona with every option... NICE |
#10
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The thermostat for a 300 SEL is as easy as pie, but the one for the 420 SEL (a V8) is not. You have to take a bit more apart and need some special tools in order to access the bolts.
After 3 hours, I gave up and had to tow it to a tech. Will see how it performs today. |
#11
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I needed a new thermostat and heater valve. The cars runs now at 82C and the heat is toasty warm.
The thermostat is pretty tricky on the 420. |
#12
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I was just wondering. What is the ideal engine operating temp?
Can you cause engine damage without the theromstat, i.e, running the engine at 60C as opposed to 85C over the long haul? |
#13
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The ideal engine temp is between 80 and 100 dC but if it goes above 100 dC there should not be any problem as long as it drops back down when the aux fans come on. You do not want to run these cars without a thermostat.
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Jim |
#14
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I'd assume that the lack of a thermostat would cause it to run more ineffieciently, but could it cause signigicant damage to rings, pistons, etc. Just curious.
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