it will turn on and run for awhile then turn off then back on for a sec then back off it is really irratic even sets the car alarm off...i have changed the sensors the thermostat and the relays...if anyone has a idea on what to try next please let me know....
2007-01-28 13:32:01 · 11 answers · asked by automatickris711 1 in Cars & Transportation ➔ Maintenance & Repairs
It looks like your wiring is shorting somewhere. If I were you, I would rewire another lead from the key switch controlled fuse, relay and/or battery to the thermostat, fan and the earth point. The likely spot of trouble may be the relay, if there is one, since you have already replaced the thermostat.
Sometimes a previous owner or mechanic may have rewired the fan leads to bypass the key switch controls so as to cool the radiator down before turning itself off. As you say, it can cause endless trouble.
Best solution would be the rewiring of the fan leads from the fuse, if replacing the relay fails. You can check which is the fuse as it would normally be marked. Usually the fuse is located under the dashboard nearest the driver. Some newer cars (after 1985) have a relay and fuse located in the engine compartment in a black box and marked very clearly, making rewiring easier.
Do it. if you are adept with wiring. Otherwise see a car wiring technician. You can screw it up if you are not familiar with the wiring.
2007-01-28 13:50:26 · answer #1 · answered by angstrom 4 · 0⤊ 1⤋
If it settles down it may be the hysteresis in the thermostatic switch, or lack of hysteresis. The replacement part may not have enough to keep it from triggering. hysteresis is the difference between the on-threshold and the off-threshold. Namely the off threshold is lower than the on threshold.
If it settles down always you can ignore it. Probably the heat in the engine core leaking back out through the water and heating the thermostat up a second or third time.
2007-01-28 21:42:04 · answer #2 · answered by Ron H 6 · 0⤊ 1⤋
well I can't explain the alarm thing, and I'm no mechanic, but I own a Nissan, and I think I read somewhere that it's normal for the fan to kick on even when the car is off. I don't know if that's a Jap thing or what...or if it's even true for that matter.
2007-01-28 21:36:53 · answer #3 · answered by BrandonM 2 · 0⤊ 1⤋
this is called an after run fan,lots of older small cars used them to keep under hood temps down after shut off.this is controled by a seperate sensor and relay pack
2007-01-28 21:52:38 · answer #4 · answered by doug b 6 · 0⤊ 1⤋
If it's doing this right after you have driven, it's normal. Maybe the engine is just getting a little hotter than normal. Maybe it's time to flush and change the antifreeze.
2007-01-28 21:37:17 · answer #5 · answered by Anonymous · 0⤊ 1⤋
its supposed to. but only for a few minutes after turning car off. it might start/stop 1-2 times. its setting off alarm because its not mounted properly and is vibrating.
2007-01-28 21:37:55 · answer #6 · answered by earlanon 2 · 2⤊ 1⤋
I don't know anything much about cars but that should be normal. I think it's just how the car cools itself off. Now you just have to worry if it doesn't do that.
2007-01-28 21:41:54 · answer #7 · answered by DropTopAle 2 · 0⤊ 1⤋
that is normal behaviour if the car was recently running for a long time. adjust the sensitivity of your alarm or move its accelerometer censor
2007-01-28 21:36:45 · answer #8 · answered by Dashes 6 · 0⤊ 1⤋
its ok.i have a 88 olds and it does that too.if you drive it for awhile it will kick on after you shut it down till the engine gets cooled down.
2007-01-29 01:28:55 · answer #9 · answered by Anonymous · 0⤊ 1⤋
It is maid to run like that till the motor cools down don't worry its fine
2007-01-28 22:21:30 · answer #10 · answered by bill_ray56 3 · 0⤊ 1⤋