I have a 1986 325e, with a replaced radiator/water pump/thermostat/new belts
My heater only works on selection 4 and A/C doesn't work
The car overheats ONLY at IDLE and its intermittent however it overheats more so than it doesn't, when I step on the accelerator the car immediately cools down. There is not a coolant or oil leak at all under the car or spewing under the hood.
2007-03-21 14:26:01 · 7 answers · asked by transatlantic0207 1 in Cars & Transportation ➔ Maintenance & Repairs
I have a 1986 325e, with a replaced radiator/water pump/thermostat/new belts
My heater only works on selection 4 and A/C doesn't work
The car overheats ONLY at IDLE and its intermittent however it overheats more so than it doesn't, when I step on the accelerator or turn on the heat the car immediately cools down. There is not a coolant or oil leak at all under the car or spewing under the hood.
2007-03-23 10:57:57 · update #1
It sounds to me as if you have cooling fan not working, it is probably electric on that model, which would mean a bad switch / temp sensor under the hood usually near where the top radiator hose meets the block - if you find it you can by-pass the swtch with a jumper wire to see if the fan will run, other the electric motor on the fan is probably bad. Depending on your knowledge of repair, you may just want to run a jumper to the motor to see if it works at all or not, if it comes on when you jump it but not while the car is running it is probably the switch, then check with the auto parts store for the location - they should be able to help.
2007-03-21 14:45:40 · answer #1 · answered by ND2000 1 · 0⤊ 0⤋
It has to be related to air flow through the radiator. When you accelerate the air flow increases. Make sure the fan clutch is engaging. It could be causing a lack of air flow at slow engine speeds. With the engine warm or hot it should be fully engaged.
To test, warm up the engine (just let it idle and get "hot" or warm)
Turn the engine off. Try and spin the cooling fan by hand. It should be stiff or hard to turn. If it just freewheels or turns easily this very well could be your problem, especially on 21 year old car! Also make sure nothing is blocking the air flow into or through the radiator. Shrouding is all in place? None of it is missing? No bugs, plastic bags, or other "trash" blocking the air flow? Last but not least ..... was the cooling system ever flushed? The heater working on selection 4 and the A/C being inoperative are not related and are separate issues from your overheating. Hope this helps!
2007-03-21 14:48:07 · answer #2 · answered by know da stuff 4 · 0⤊ 0⤋
If the radiator isn't warm while the engine is overheating i might replace the thermostat. in any different case if the radiator fan does not run while the vehicle is warm and you're idling the vehicle is amazingly probable to overheat because of the fact there is no air flow interior the direction of the radiator. If on an identical time as the vehicle is overheating you connect the fan directly to the battery and it works it would cool the vehicle. If this occurs then you definately comprehend that its surely that the fan isn't turning and that's the place you will possibly desire to concentration. Get a provider instruction manual with a schematic diagram (not a block diagram) of the electrical powered gadget. a solid schematic will instruct the certainly wiring with coloration codes and connectors which you will might desire to track the circuit. Use a voltmeter and initiate up on the fan and artwork your way backwards. If the fan is pushed via a relay there might desire to be voltage at between the relay contacts while the relay is inactive and voltage at the two contacts while the relay is lively. If there is no voltage at any of the contacts then you definately might desire to envision any fuses. If the fuse is solid then you definately verify the wiring for corrosion. If that's an older motor vehicle it must be corroded wiring. verify for power on the fuse and if there is none grant it from the battery. If all tests ok then verify to work out if power is geared up to the relay coil. whether that is and relay does not close then its the relay. If there is no voltage and the vehicle is warm then you definately might desire to track out the wiring to diagnose what's powering the relay. you additionally should verify the temperature sensor. Disconnect the temperature sensor and use an ohm meter to degree conductivity while the vehicle is chilly and while that is warm. in case you spot no distinction then it would get replaced. a solid provider instruction manual might desire to state precisely what to look for. wish this facilitates
2016-10-19 07:33:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Any car that is overheating, when you turn on the heat it acts just like another fan and will help to cool down the motor. Just a tip.
Thenew thermostat could also be defective causing the car to overheat.
2007-03-26 11:45:38 · answer #4 · answered by z 2 · 0⤊ 0⤋
When the heater is on it helps cool the car. Not sure how it works but anytime I have over heated I place the car in drive and turn the heater on full. You may want to check the therostat this it usually a good cheap solution.
2007-03-21 14:40:45 · answer #5 · answered by Brigitte B 2 · 0⤊ 0⤋
Cuz it's designed to cost you lotsa money. BMW= Break My Wallet
2007-03-28 20:27:51 · answer #6 · answered by BillyTheKid 5 · 0⤊ 0⤋
because there is no air going through the moter. I would say that your radiator fan is not working.
2007-03-21 15:15:50 · answer #7 · answered by Anonymous · 0⤊ 0⤋