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Jay Ball asked when my car get to hot it slows down and when at a stop light it act like it will cut off and i smell exhaust?
and it runs slow when it get a certain Temperature but when it cool off it is fine.
And got the following answer:
I highly suggest that you check the coolant level and test the quality and mixture of the coolant too.The over flow or reservoir container has a cold full marking and a hot full marking , never remove the rad cap or reservoir cap when the engine is hot wait till it's cool. Buy yourself a anti-freeze tester from a parts store etc spend the 10 or so bucks on one they are a tool every driver or vehicle owner should have handy.Be sure to read the instructions completely bec it's vital how you hold and use the tester , it will tell you the mixture or quality levels.You want it mixed 50% anti-freeze and 50% distilled water for around -40c or 50/50 and in extreme temperatures no more then 60% anti-freeze. I think from what you're saying the fan system is probably not working and as the engine over heats and coolant heats up you're smelling it, plus the hotter the engine runs the more the extreme heat effects the transmission and that greatly affects how the sensors and comp systems operate as well as the exhaust system. You don't mention the year/model/make/engine type or mileage and I don't think that my crystal ball is working right now but start with checking the coolant level and quality then check all the other fluids such as the transmission fluid, brake, power steering fluid etc.Then make sure no leaks exist check the engine/transmission ,all the rad hoses/hose clamps/hoses, steel coolant lines.From there if no leaks and all fluids are okay , start it up and allow the engine to warm up, monitor the engine area and temperature gauge.The low fan should be able to be heard coming on just before the half way marking on the gauge if the system is working properly.If you don't hear or see any fan or fans engaging by that point then turn the engine off and check the fuse/relay charts on the fuse box/boxes/in the owners manual locate the low fan relay.In many cases there are two fan relays one low and one high fan relay and sometimes the relays are in fact exactly the same part number.Try switching those relays or find another relay that is the same as the low fan relay then start up the engine, allow it to warm up and see if the low fan starts to engage. In any case the high fan should engage if the low fan fails or when a working A/C system is turned on while the engine is idling and warmed up.So if either the working A/C compressor being turned on or the temperature gauge hitting past the half way marking and the fan system fails to come on you know that the fuses that feed the fan system should be checked. Also as I've mentioned any related relays should be checked and there is a way to jump the relay socket connections so that the low or high fan should come on.Example pin 87 feeds the low fan a positive 12 volts when the low fan is turned on by the comp detecting it via the temperature sensor reading.Pin 87 in fact gets it power from pin 30 internally switched by the relay so if pins 30 and 87 of the low fan socket connectors were jumped with a 12 gauge automotive wire the low fan should engage.A test probe could tell you what pins are what bec usually pin 30 is a constant hot, otherwise pin 30 becomes live once the key is in the run/acc or start position.Some relay designs use another positive 12 volt feed at pin 86 this is what actually heats up the relay's internal coil that operates the relays on/off feature via the negative feed wire from the main comp.Meaning pins 86-85 are the turn on signal and pin 30 is the actually higher amp 12 volt positive feed supplied to the fan or to the fan module then the fan motor. If the fan/fans aren't working then you know why the engine is over heating in stop and go or slow traffic and usually at hwy speeds the engine doesn't tend to over heat bec the fans aren't normally used at hwy speeds bec the thermostat and water pump are working properly , but again if the A/C was on usually the high fan system engages asap regardless. Possible causes of the failed fan systems if not the relays or fuses could be the temperature sensor or within the comp system/relay/fan wiring or ground related issues or the fan module fails or the high/low fan/fans motor/motors are faulty. If it's not a fan related problem then the thermostat or coolant level/quality can cause such issues so can a faulty water pump and the list goes on and on of the possible causes.Remember that like most automotive fluids , fluids wear out or wear down regardless of what the fluid levels are etc. Hope that helps and best of luck.By the way just start with the basics and work from there on it but you might need a shop to take a look at it or have someone handy and knowledgeable check it out for you bec it's not good to over heat and drive any vehicles that have engine over heating issues.
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