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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / July 2006Volvo 240 (1990) running hot - flushed coolant, but???
My 1990 Volvo 240 wagon runs a little hot when in traffic on a hot day. It doesn't overheat, but it still makes me nervous. I flushed the coolant, and it still does it. I also cleaned the contacts on the temp. compensation board and installed a new thermostat. The heater seems OK. When i turn off the heat, it stay on for a while while I am trying to get cold air out. It is kind of a strange cooling system on this car, there is no radiator cap, and no drain plug either - you just take the lower radiator hose off and watch coolant go everywhere except in the container it is supposed to. My last vehicle was a toyota truck from the 80s and it did the same thing when I got it, but flushing it out worked perfectly, because there was a bunch of gunk in there. The volvo coolant seemed clean..... Do I just need to re-flush that shizzle, or??? I have never had this happen on any of my cars where it would not go away. lolo Wrote: > My 1990 Volvo 240 wagon runs a little hot when in traffic on a hot day. > It doesn't overheat, but it still makes me nervous. I flushed the [quoted text clipped - 11 lines] > Do I just need to re-flush that shizzle, or??? I have never had this > happen on any of my cars where it would not go away. you've either got some air trapped in the cooling sytem, or your radiator fans aren't cycling properly...  Signaturejeffcoslacker http://www.automotiveforums.com > My 1990 Volvo 240 wagon runs a little hot when in traffic on a hot day. > It doesn't overheat, but it still makes me nervous. I flushed the > coolant, and it still does it. I also cleaned the contacts on the > temp. compensation board and installed a new thermostat. The heater > seems OK. When i turn off the heat, it stay on for a while while I am > trying to get cold air out. That's normal...there is usually residual heat. Turn the AC on for a mement and that will extract heat quickly. > It is kind of a strange cooling system on > this car, there is no radiator cap, and no drain plug either - you just > take the lower radiator hose off and watch coolant go everywhere except > in the container it is supposed to. No cap...not possible. There should be one on the expansion tank that connects to the radiator. Is the expansion tank filled to the proper level? > My last vehicle was a toyota truck > from the 80s and it did the same thing when I got it, but flushing it > out worked perfectly, because there was a bunch of gunk in there. The > volvo coolant seemed clean..... The truck has no bearing on this problem...not sure why you brought it up. > Do I just need to re-flush that shizzle, or??? I have never had this > happen on any of my cars where it would not go away. Shizzle??? You may have an air bubble in the cooling system. Did you bleed the cooling system when the fluid was drained out? If your car has a viscous damped fan that may not be operating properly, or the belt may be loose. If you car has electric fans then one may not be working properly. >> My 1990 Volvo 240 wagon runs a little hot ... One thing more: Are you sure it is really heating? Try checking the temp. with another method--always a possibility the gauge is giving inaccurate readings. Hope this is the case. s Sorry, what I meant was the radiator cap is not on the radiator, it's on a reservor to the side, which is weird to me. I am used to being able to look down into the radiator to see what condition or how full it is. > > My 1990 Volvo 240 wagon runs a little hot when in traffic on a hot day. > > It doesn't overheat, but it still makes me nervous. I flushed the [quoted text clipped - 34 lines] > properly, or the belt may be loose. If you car has electric fans then > one may not be working properly. > My 1990 Volvo 240 wagon runs a little hot when in traffic on a hot day. > It doesn't overheat, but it still makes me nervous. I flushed the [quoted text clipped - 11 lines] > Do I just need to re-flush that shizzle, or??? I have never had this > happen on any of my cars where it would not go away. One thing more: Are you sure it is really heating? Try checking the temp. with another method--always a possibility the gauge is giving inaccurate readings. Hope this is the case. s Yeah I hope so too. That was what I mentioned about the temerature compensation board. On these 240s, the Temp comp. board can start going out, and then you have no idea if it's actually hot or not. The sypmtoms only happen when it SHOULD be hot, though (stuck idleing for a long time in 90 degree weather), so I leaning toward the air bubble in the cooling. How do I bleed the cooling system? I've done that on Hondas that have bleeder valves, but it seems like it could get real messy real fast on this beast. If there is air in the system, will it eventually work it's way into the reservoir? That's what I was counting on... I have never had a vehicle that didn't have the cooling system cap on the top of the radiator, but I assumed it was the same/ similar. It is a mechanical fan and the fan clutch seems OK. When I was flushing it, I had the lower radiator disconnected pointing downward into a bucket, and while running the engine, not much was coming out... maybe I didn't run it long enough for the thermo to open. thanks for the ideas! loren > > My 1990 Volvo 240 wagon runs a little hot when in traffic on a hot day. > > It doesn't overheat, but it still makes me nervous. I flushed the [quoted text clipped - 15 lines] > temp. with another method--always a possibility the gauge is giving > inaccurate readings. Hope this is the case. s OK, nobody's talking, so I'm gonna throw out what I think might work. If I loosen the top radiator hose (with the engine cold of course) and let out all the air (preferrably from top of hose) until coolant starts coming out, then tighten it back down, that would probably work, right.... Then I run the car and do it again when it's cool enough. This is so strange to me after having about 10 different cars with the cap on the top of the radiator - it was so easy - air goes to top of radiator, take off cap, add coolant. Done. This seems very round-about and unneccesary, but who the hell am I, besides I bought the car, eh? > Yeah I hope so too. That was what I mentioned about the temerature > compensation board. On these 240s, the Temp comp. board can start [quoted text clipped - 38 lines] > > temp. with another method--always a possibility the gauge is giving > > inaccurate readings. Hope this is the case. s > OK, nobody's talking, so I'm gonna throw out what I think might work. Sorry for not answering, as I had hoped for a more knowledgeable one than I would answer. My only thought is to try and find a heater hose whose height is physically above the radiator top & burp it through there--maybe even fill it from there. Luck to you & please post back as to what you found that works. s the more I have been thinking about this (don't have time to work on car during the week because of stupid work), it has to be air in there. The expansion tank (i even figured out what that's called) hose enters the radiator in the middle (from top to bottom), so it only makes sense that there would be a LOT of air trapped in there, since the only place it would have been able to escape would have been the top radiator hose. I will burp it later, and I'm sure it's gonna be fine. I've been driving it, and under normal condition the temp. is perfect - no false readings from the gauge - fan clutch still seems fine, so if burping don't fix it, I drive the car off a cliff and everything is settled! thanks to everyone who gave me ideas and good advice! > > OK, nobody's talking, so I'm gonna throw out what I think might work. > [quoted text clipped - 3 lines] > even fill it from there. Luck to you & please post back as to what you > found that works. s Volvo service manuals usually describe a series of steps to follow when releasing trapped air. You may want to refer to a shop manual. Lacking that I would work my way up to the highest hose including heater hoses. > the more I have been thinking about this (don't have time to work on > car during the week because of stupid work), it has to be air in there. [quoted text clipped - 17 lines] > > even fill it from there. Luck to you & please post back as to what you > > found that works. s |
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