- Joined
- Dec 25, 2002
- Location
- mont, AL
Pretty early in the diagnosis of this ailment (whatever it may be), so initial information is going to be a little sparse.
background: 1991 940 turbo (project bpu), recently replaced transmission..as in monday night recently replaced.
no obvious transmission leaks across two separate trips yesterday, no drips or drops in the driveway yesterday afternoon. Today, while outside with the 3 year old I noticed what looked like a puddle underneath the car.. but a little forward of where you'd expect a transmission leak. rolled the car backwards, and based on the taste test and 'look', it's not atf, but rather coolant.
Immediately suspected the heater control valve (it's not ruled out yet, but not obviously failed either), popped hood and was surprised to see it still where it belongs, and further, intact. it did appear that the source of said coolant came from somewhere on that side of the engine bay, but still not able to pinpoint. Transmission bellhousing was clean.
In checking the overflow (to verify/see), I noticed that the cooling system was still very much pressurized despite the car having sat for ~15 hours give or take. pressurized like sprayed coolant out when I loosened the cap. overflow looked kinda cruddy, but not really any worse than it's looked the whole time. coolant level was indeed low, but I also have a slight heater core leak these days, and of course, this puddle on the ground. topped it up, cranked the car up, noted what sounded like one cylinder deviated from the rest, but nothing glaring there. at idle, it's not obviously pressurizing the cooling system, nothing strange in the oil or under the cap. let the car run up to operating temp, and nothing strange there either. so I'm at a bit of a loss on this right now. I'll probably run a compression test on it later this afternoon (it also developed an occasional/intermittent low speed miss recently, but that seemed at the time to be more attributable to a coil flaking out in cold temps, as it would go away once the car was warmed up and driven a couple of miles). With the lockup converter locked up, I also noted a 'bumping' sensation at low engine speeds while cruising. I attributed that to perhaps overzealous timing advance, but maybe not?
no strange stuff out the tailpipe, car seems to run fine at WOT the brief bit I've hit it the past two days, nothing has gotten obviously worse. I still like my coil idea regarding the miss, but I'll have to let the plugs convince me I reckon.
any other thoughts as to the source of the coolant on the ground?
background: 1991 940 turbo (project bpu), recently replaced transmission..as in monday night recently replaced.
no obvious transmission leaks across two separate trips yesterday, no drips or drops in the driveway yesterday afternoon. Today, while outside with the 3 year old I noticed what looked like a puddle underneath the car.. but a little forward of where you'd expect a transmission leak. rolled the car backwards, and based on the taste test and 'look', it's not atf, but rather coolant.
Immediately suspected the heater control valve (it's not ruled out yet, but not obviously failed either), popped hood and was surprised to see it still where it belongs, and further, intact. it did appear that the source of said coolant came from somewhere on that side of the engine bay, but still not able to pinpoint. Transmission bellhousing was clean.
In checking the overflow (to verify/see), I noticed that the cooling system was still very much pressurized despite the car having sat for ~15 hours give or take. pressurized like sprayed coolant out when I loosened the cap. overflow looked kinda cruddy, but not really any worse than it's looked the whole time. coolant level was indeed low, but I also have a slight heater core leak these days, and of course, this puddle on the ground. topped it up, cranked the car up, noted what sounded like one cylinder deviated from the rest, but nothing glaring there. at idle, it's not obviously pressurizing the cooling system, nothing strange in the oil or under the cap. let the car run up to operating temp, and nothing strange there either. so I'm at a bit of a loss on this right now. I'll probably run a compression test on it later this afternoon (it also developed an occasional/intermittent low speed miss recently, but that seemed at the time to be more attributable to a coil flaking out in cold temps, as it would go away once the car was warmed up and driven a couple of miles). With the lockup converter locked up, I also noted a 'bumping' sensation at low engine speeds while cruising. I attributed that to perhaps overzealous timing advance, but maybe not?
no strange stuff out the tailpipe, car seems to run fine at WOT the brief bit I've hit it the past two days, nothing has gotten obviously worse. I still like my coil idea regarding the miss, but I'll have to let the plugs convince me I reckon.
any other thoughts as to the source of the coolant on the ground?