Question about 1991 Mercedes-Benz 420

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Overheating-computer problem? overheating

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Thermostat, water pump, low A/C charge or temp sensor which controls low fan speed. Engine temp C/O sensor which controls high speed fan. Strip fuse which supplies power to fan or the relay.

Posted on Jul 07, 2009

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Posted on Jan 02, 2017

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Can an overheating transmission affect the computer box? iam thinking that maybe the computer could have been affected after the transmission overheated


If you tranny is sending an error signal to computer it can prevent car from starting. Kinda like when you have the auto stick to choose Drive, Reverse, etc in the Reverse position car win't start unless in Drive. Take to a place that can read the code from the computer and it'll likely have an answer to your non-start. Hopefully you won't be spending $2000 for a transmission job!
Why change fuel pump? Was there no pressure on fuel rail? Was it not making its pump sound when key in acces. position? Did you check fuel filter if it indeed is a fuel related issue? Clues are awaiting your inspection such as rusted fuel tank, water in line, etc. by checking. But I'd want to know WHY you chose to replace pump since it has nothing to do with tranny.
IF a transmission related issue and you haven't gotten it to a place to read computer you might want to check if your vehicle has a separate transmission cooler up with radiator (usu. in front of radiator behind grill). See if fluid is flowing thru the cooler. If it is plugged then the transmission can have fluid but its overheated because its in a closed loop essentially and if it hasn't warped your metal trans. parts the overheated trans. fluid might send a stop signal to computer so won't start. Open T-valve and see if trans.fluid is in trans. cooler (again IF your vehicle has one, not all do but things meant to tow usu. do) and if so examine fluid and connections.

Dec 24, 2014 | Isuzu Cars & Trucks

5 Answers

Fix an overheating buick rendezvous 2002. Truly overheated once, then had the radiator flushed and replaced, along with thermostat (twice) and water pump. Now, the computer indicates it is overheating


You have a needle in a haystack because so many things can cause your problem. I am leaning toward the main computer - which you can replace yourself for around $300. There are companies on the internet that will send you your pre-programmed computer, you have to supply your VIN number. Like many internet companies I always recommend that you are careful in your selection. Be careful to find a reliable company and call them on the phone to make sure they are a real company. If they do not have a phone number - find a different company.

Here are a couple things to try first:
1) Coolant sensor - but this usually makes your car run really poor because it can change the gas/air ratio. If your car is running great other than the overheating sensor - then this probably is not the problem. But worth checking.

2) Serpentine Belt - sometimes when you change the serpentine belt you can put it back on the pulleys out of order. Your car can run great but can cause overheating especially if you have the water pump turning backwards. Since you had the water pump changed you might just take a look at the belt to make sure it is wound correctly. There should be a sticker under the hood.

All said -- I am still leaning toward the main computer.

Nov 28, 2014 | 2002 Buick Rendezvous

1 Answer

Overcharge light came on and car overheated, check engine light came on and o/d light flashed, how do i troubleshoot?


I would start with having the computer checked for trouble codes and find out why it overheated. The codes may direct you as to what to test.
Most auto parts stores can scan the computer for free in hopes of selling you some parts.

Dec 09, 2012 | 2000 Suzuki Esteem

1 Answer

Ford e350 02 it shows that it's overheating but is not


And you have scanned the system computer signal from the ECT to verify the engine is not overheating?? I bet it is overheating.

May 24, 2012 | 2002 Ford E350

2 Answers

My 2008 Acadia is overheating. About 6 months ago it overheated but cooling levels were fine. Nothing was repaired and everything started working as expected. Yesterday, it started overheating again. ...


it sounds as though your acadia may not actually be overheating, it sounds more like the tempeture sensor is bad, if its "froze" at a certain reading this could fool your computer, you should be able to replace this part for around 20 or 30 dollars. hope this helps

Apr 03, 2011 | 2008 GMC Acadia

1 Answer

1989 Dodge Aries Overheating


How about a temperature sensor? If it's faulty it could be sending the wrong messages to your computer and your dash light.

Jan 27, 2010 | 1989 Dodge Aries

1 Answer

My truck is showing me a code on the dashboard that says: ENGINE HOT A/C TURNED OFF, air blows but the A/C doesn't. How can I fix this? thank you


A/C turns off when the engine overheats, if it isn`t actually overheating, your coolant temp. sensor could be bad, which would make the computer think that it is too hot.Look for overheating first then check that sensor if not overheating.

Oct 26, 2009 | 2007 Chevrolet Silverado 1500 2WD

1 Answer

OVERHEATING


sounds like everything is working right but the computer is not turning the fan on. i would say the temp switch for the fan. it sends a signal to the computer to turn it on. it is very cheap and is the most common and likely problem.

good luck and please ask any more question you have

Sep 26, 2009 | 2005 Ford Ranger

1 Answer

Dies with no warning after it warms up


if the computer is located in the engine compartment it could be overheating. the solution to the computer overheating is a new computer. expensive. I have seen this happen on other vehicles as well.

Jun 15, 2009 | 2003 Cadillac Escalade Ext

1 Answer

2000 Lincoln LS Overheating


sound like a faulty engine coolant sensor. if the computer gets a signal that the engine is overheating it goes into protection mode and shuts the engine off to prevent damage. have it scanned for fault codes. mike

Jan 06, 2009 | 2000 Lincoln LS

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