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Topic: Overheating/weird autobox (Read 1226 times) |
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Alf
Newbie
1995 2.9 24V Ghia Estate
 
Posts: 46
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Overheating/weird autobox
« on: Jul 22nd, 2005, 5:45am » |
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Hi there,
The current problem is when I'm in a very hard traffic jam (it took about 1 hour yesterday), the engine overheats (gauge in the red area, fortunately no steam coming out, yet) and the autobox starts to operate weird. It seems that it chenges between 1st and 2nd at very low speed (about 10-20 km/h), and when stopping, it can't release from gear, and when accelerating, the engine revs up, but the car doesn't accelerates as well as it should. Like it is slipping, or something. After I was out from the jam, and on the highway again, the temperature dropped to normal, and the autobox was operating normal again.
For info: the fluid level in the autobox is OK, colour is red, the engine coolant is at normal level also. The car has the additional cooler for the autobox fliud. I don't know whether the O/D OFF light blinks or not, because the bulb in the dash is out or blown (as well as the speedo control's light).
I'm sure that the box and the engine have no problems basically, because at normal operating temperature they work great. I just have to stop the overheating before anything dies.
What should I check? Any information or idea is welcome!
Thanks in advance,
Alf
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Alf
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Octavian_P
Senior Member
 
Posts: 1126
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Re: Overheating/weird autobox
« Reply #1 on: Jul 22nd, 2005, 9:31am » |
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Hi there
You haven't mention if your cooling fans function. Just select AC and they should come on ( a quick check but not a verry good one).
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2.0 16V Ultima|2.3 16V Ghia|2.9 24V Cosworth Ghia
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #2 on: Jul 22nd, 2005, 9:49am » |
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Thanks! I'll check in 10 minutes!
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Alf
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #3 on: Jul 22nd, 2005, 9:54am » |
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Yes, both fans are running if I turn on the AC! What's next? 
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Alf
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Snoopy
Administrator
Very old.BAD tempered and missing friends.
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Re: Overheating/weird autobox
« Reply #4 on: Jul 22nd, 2005, 10:18am » |
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Do the fans come on with the rise in temperature?
If not then I think you have a sender/sensor problem!
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #5 on: Jul 22nd, 2005, 10:20am » |
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Good question... is there any direct relation between the dash gauge and the fan switches, or there are two sensors (one for the gauge and one for the fans) ?
Either case, when they should come on?
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Alf
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Octavian_P
Senior Member
Posts: 1126
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Re: Overheating/weird autobox
« Reply #6 on: Jul 22nd, 2005, 12:19pm » |
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I think the fans should come one when the temperature gauge goes over half of it's scale. You can leave the car running on iddle, and wait for it to heat up. Also try a dashbord reset (hold the tripmeter button pressed about 10 seconds - it'll beep with the key on motor position).
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2.0 16V Ultima|2.3 16V Ghia|2.9 24V Cosworth Ghia
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #7 on: Jul 22nd, 2005, 12:23pm » |
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Understand. This will be an easy job today, it's about 33oC outside
What's this dashboard reset for?? Never heard about it.
I'll keep posting the results from monday (I have no connection from home  ).
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Alf
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Dave
Senior Member
Tourmallard 24v (ex-owner)
Posts: 1984
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Re: Overheating/weird autobox
« Reply #8 on: Jul 22nd, 2005, 1:20pm » |
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Alf,
just to confirm what Octavian_P said, on our 1996 24v the cooling fan comes on when the gauge goes just over half way.
Cheers
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Octavian_P
Senior Member
Posts: 1126
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Re: Overheating/weird autobox
« Reply #9 on: Jul 22nd, 2005, 2:50pm » |
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The dashboard reset is let's say a "calibration" just to be shore that the needels go all the way up.
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oz_scorpio
Newbie
I'm a YaBB newbie!
Posts: 9
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Re: Overheating/weird autobox
« Reply #10 on: Jul 23rd, 2005, 7:41pm » |
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I had a similar over-heating problem last week with my '95 2.0 DOHC - fans not activating - I replaced the temp sender unit and cured the problem.. 
see "Help - Auto 4th, Faulty PCM?? Solenoid?" thread below
CS
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sardine
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I'm a YaBB newbie!
Posts: 21
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Re: Overheating/weird autobox
« Reply #11 on: Jul 24th, 2005, 2:28am » |
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Hi
(24v 1995 estate)
I have had a similar problem. Last week the top hose split on the motorway - the car quickly steamed dry and I coasted the remaining 500yds home. I replaced the hose, filled it and changed the oil having let it cool naturally overnight.
It seemed at first to run fine but it changes rather hard at 10, 20 then 30mph - I'm sure it didn't before.
It also has a rather concerning ticking audible wiht the window open at low speed - in time with the revs
What else should I do to check for damage caused by overheating - should I change gear oil, check compressions or anything else?
Thanks
Darren
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #12 on: Jul 25th, 2005, 5:38am » |
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Dave,
Thanks, it seems that the fan is coming on, but I can't tell exactly when. It's sure, that it's somewhere over half way.
Octavian_P,
Thanks, I did the 'calibration', all the gauges work fine.
oz_scorpio,
Thanks, I've already read your thread, I wish my problem would be the same!
All,
Is that possible, that a non-existing thermostat causes cooling problems? I'm not sure the car has it or not, but it takes about 20 km of driving for the engine to warm up to normal operating temperature. And when the coolant was almost boiling, it was very hard to get it cooled down with running fan(s), I had to drive almost 30 km on the highway. My idea is without thermostat it's 'too late' for the fans to cool down the system from this high temperature. Am I right or stupid? 
One more question: if the sender unit for the fans fails, then how does it work? It switches at a wrong temperature or it doesn't switch at all?
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Alf
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Octavian_P
Senior Member
Posts: 1126
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Re: Overheating/weird autobox
« Reply #13 on: Jul 25th, 2005, 7:35am » |
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Well not really, the thermostat does exactly the oposite, it opens after the engine gets warm, this helps the engine to get to it's optimum temperature faster. There's another thing with thermostats, because sitting in hot watter all their life, after sometime they get cloged, stuck etc. so in your case mabe it's halfway open all the time. This would explain for late warming of engine and bad cooling effect after (low water flow).
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2.0 16V Ultima|2.3 16V Ghia|2.9 24V Cosworth Ghia
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #14 on: Jul 25th, 2005, 7:57am » |
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Hmmm... sounds logical.... although I've never seen a halfway open thermostat, only fully open or stucked. Thanks for the tip, will check that.
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Alf
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #15 on: Jul 27th, 2005, 4:46am » |
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Update: If I run the car with climate control switched off, then it's not overheating so fastly. I don't understand the problem at all.
I'll buy a new thermostat and a new sensor for the cooling fans.
Does anyone have a picture about where's the thermostat and the sensor on the engine??
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Alf
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: Overheating/weird autobox
« Reply #18 on: Jul 27th, 2005, 6:55am » |
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hi there
off the top of my head, i'd say it's the temp sensor for the dash. or it could be the pcm! (can't remember which way round!) there's 2 sensors, 1 for the dash and 1 for the pcm. it's the pcm that controls the engine fans.
hth
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Alf
Newbie
1995 2.9 24V Ghia Estate
Posts: 46
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Re: Overheating/weird autobox
« Reply #19 on: Jul 27th, 2005, 7:10am » |
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Thanks!
The pcm's sensor is a 2 wire sensor, and the dash gauge sensor is a single wire, am I right?
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Alf
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