Hello I was wondering if anyone has had a similar problem. I am trying to fix an overheating problem, on a 99.5 mk4 jetta 4cyl. I have changed the thermostat, then I went to autozone and used the VAG. I got an error code p0117 trouble shooting says: coolant temperature (ECT) circuit low
I have replaced the ECT sensor and no luck
also the fan dosent come on while overheating but if you press the AC button on the dash the fans do work but not enough to cool the coolant any help would be appriciated im stumped.....
However, it does sound like wiring... Fans definitly should be on when overheating. The fans don't seem to be getting the message from the ECU saying ''turn on''.
I have checked the fuses in the cabin and when I replaced the termo, I used G-12 coolant wich is pink. Also the temp gauge maxs out the dummy light comes on and as I posted I used a VAG to read the check engine light. The coolant resovour is boiling hot. I also posted the reading from the VAG I am trying to avoid the stearlership shop prices I can do most about any work if I can figure out the problem so any help would be greatly appriciated. Thanks GUYS AND GALS.
Could this possibly be the water pump? Would the fans not turn on if the hot water wasnt making it to the radiator? What about the heater core? Or the coolant fan relay? I also just read that there is a three prong coolant temp sensor conected to the radiator its self I think I will replace that one also to see if that kicks on my fans!
Oh about the scanner my bad lmao, milage is only 66,000 my girlfriend just bought it 2 months ago, so im not sure about the replacment of the pump and timing chain but I would suspect no. where is the ECU located? should I be looking for melted wires or what lol.
I have an 2001 Jetta VR6, she really liked mine, the one without problems. She decided to get one here self, kept trying to tell her to get the VR6 lol.
lol gotcha. Cant trace wires from the ECU... Impossible lol. Check up with that three prong sensor, I've never heard of it? Hm.. www.germanautoparts.com has good prices on stuff like that.
Water pump wouldn't affect fans turning on. The ECU gets its readings from the CTS (also known as ECT), but you replaced that for one with a green top, right??? Cause CTS is usually at fault.
hummm... 1.8 engine right? it really seems that your water pump is shot, but from your code, u would think that is an electrical problem...
Your timing belt change is overdue, u gotta change it at 60 k and it is a BIG DEAL if u dont. When u do it, there is a kit sold everywhere that contains the belt, tensioner, water pump with METALLIC IMPELLER (pretty important detail) and thermostat. U dont need to thermostat anymore, so dont worry about that one.
get it all done and see what happens. If u take to a shop, u are looking at $800-1000 parts + labor. I would not recommend doing one yourself unless you are a complete gear head lol
really? i always buy from them... thanks for the heads up
the thing about timing belts is: u CANNOT afford a mistake. u cannot go back and fix it. If u do something wrong and turn your engine, you are done lol
im all for doing the repair ourselves, but that one is just scary ha
I was trying to avoid the whole water pump scenario but thanks for the encouragment lol. Anyway yea I feel competant enough to change the pump and chain. Should I first, try to change the sensor in the radiator and if see if that works.
Hmm! I just changed the radiator fan switch and the funny thing is; I warmed up the car untill the temp went well past the 190 mark, then I relased the radiator drain plug while hot. Then my fans kicked on. So my assumption now would be that the coolant is not circulating properly or else the fans would have came on when it hit 190. Time to start looking for a pump kit. lol. Also, I have read, these systems need to be vacumed when replacing the coolant. Would this cause the car to continue overheating or not circulating the coolant properly? Can any one walk me through vacume sealing the coolant system?
when i drained mine i did not do all that. I think what they are trying to avoid is coolant contamination.
To do a coolant flush is not hard, just messy lol
oh, make sure when u take your water pump apart that everything is in there. I say this cause a lot pumps plastic impeller fail, and that could clog up your line. If a part of the impeller is missing, find it haha, if you are not lucky THEN vacuuming wouldnt be a bad idea
Yea I used to have this jeep and ripped that whole coolant system apart several times flushing, replacing, changing, and machining, even took the whole top half of the engine apart before I relized the block was cracked lol. But thanks for the tip on searching for missing fins prolly get the new pump kit in a couple of weeks works kinda slow and I will be sure to remember that. thanks for the help I will keep you posted
im gonna change up my thermostat this weekend too ha
glad to help man, good luck
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