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![]() | Engine running hot and lack of hot air in cabin Engine temp is climbing to the top white line, and there is no hot air from the footwell blowers. Airlock in cooling system I assume? Top rad pipe is hot, lower one is considerably cooler. I thought I had bled it completely last weekend.... ![]() |
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![]() | Re: Engine running hot and lack of hot air in cabin Additionally it could mean a massive airlock like you suggested Ucof. I think there are two bleed screws, one on the radiator and one near the heater matrix pipe at the bulkhead. Did you bleed the system from both of them? Also, did you change the thermostat? Another possibility is that the thermostat is sticking shut, but they are still designed to let a small amount of coolant through even when closed. That may explain why the top pipe is getting hot from the small amount of heated coolant that is coming through and why the bottom pipe is staying cool. I'd do the following, in this order, until the problem is eliminated: 1. Bleed the cooling system again 2. Replace the thermostat 3. Reverse flush the radiator/ cooling system 4. Change the water pump I suspect 1 and 2 may solve your problem! Good luck, Chas Last edited by Chas Uno; 26-03-2010 at 13:47. |
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![]() | Re: Engine running hot and lack of hot air in cabin Cheers for that ![]() There's a guide around somewhere explaining how to test the thermostat isnt there? |
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![]() | Re: Engine running hot and lack of hot air in cabin They are for me at the moment ![]() I'll have a look on the yaBe. mumblegrumblestupidcounciltaxandrentandbillsandfoo dandpetrolmumblegrumble. ![]() actually, this one is cheap - http://cgi.ebay.co.uk/FIAT-UNO-60-1-...item5886b9c979 - that'd fit wont it? Last edited by Ucof; 26-03-2010 at 15:12. |
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![]() | Re: Engine running hot and lack of hot air in cabin They are for me at the moment ![]() I'll have a look on the yaBe. mumblegrumblestupidcounciltaxandrentandbillsandfoo dandpetrolmumblegrumble. ![]() actually, this one is cheap - http://cgi.ebay.co.uk/FIAT-UNO-60-1-...item5886b9c979 - that'd fit wont it? Otherwise just buy a new one. Remember, a jammed shut thermostat will cause the engine to overheat. Dealing with a blown head gasket is going to be a lot more expensive than replacing a thermostat ![]() Don't forget to try re-bleeding the cooling system first though, that might solve the problem! Last edited by Chas Uno; 26-03-2010 at 15:19. |
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![]() | Re: Engine running hot and lack of hot air in cabin Ah righto. Thanks again. ![]() Then this'll do I think - http://cgi.ebay.co.uk/THERMOSTATS-KIT-FIAT-UNO-1-0-1-1-1-3-1987-2000_W0QQitemZ250516696842QQcmdZViewItemQQptZUK_Ca rsParts_Vehicles_CarParts_SM?hash=item3a53f56f0a - note that the picture is not what I'd be getting.... which is a bit stupid really. Just a thought - i dont think the fan is kicking in automatically anymore either.... how do I reset the ECU again? Disconnect the batter for 30 mins, then reconnect and run the engine 'til it kicks in?? Last edited by Ucof; 26-03-2010 at 17:43. |
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![]() | Re: Engine running hot and lack of hot air in cabin Ah righto. Thanks again. ![]() Then this'll do I think - http://cgi.ebay.co.uk/THERMOSTATS-KIT-FIAT-UNO-1-0-1-1-1-3-1987-2000_W0QQitemZ250516696842QQcmdZViewItemQQptZUK_Ca rsParts_Vehicles_CarParts_SM?hash=item3a53f56f0a - note that the picture is not what I'd be getting.... which is a bit stupid really. Just a thought - i dont think the fan is kicking in automatically anymore either.... how do I reset the ECU again? Disconnect the batter for 30 mins, then reconnect and run the engine 'til it kicks in?? ![]() Fan not kicking in - have you checked the fan actually works? Have you tried wiring 12v directly to it? Might be the fan switch on the radiator also? As for resetting the ECU, I think that's what you do. I'm not that familiar with the later mk2 SPi system, sorry. It's been Weber carbs all the way for me! ![]() |
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Join Date: Oct 2004 Location: N.W.
Posts: 2,846 Thanks: 84 Trader Rating: 9 ![]() | Re: Engine running hot and lack of hot air in cabin To add to the above, Think the Uno can sometimes get air locked even when bleeds are open. tail tail sign is that the system appears full after about only a liter of water ![]() can try blowing into the rad cap hole (when cold) and or squashing the top and bottom hoses in situe. How long has it been run for since the last time you flushed it? a few mins at idol or revving past say 4K rpm? has it been OK since, and then gone bad? was thinking knackered pump too but would there be any hear past the thermostat ![]() to test the fan, there is an electrical plug at the bottom of the radiator which is fixed into the rad temp switch. pop the plug off and attach a wire between the pins to bridge the gap (leaving the swith in the rad). be ware as the fan should instantly come on and stay on till the wire is removed - don't get tangled up in it or fingers chopped off ![]() Good luck!
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![]() | Re: Engine running hot and lack of hot air in cabin As the Chuckle Brothers would say: Oh dear, oh dear, oh dear... Temp needle hit the red on the way home today so I stopped off and popped the bonnet. First thought: bleed the system. So I undid the screw up near the bulkhead. Psssssssssssssssssssssssssssssssssssssssssssssssss ssssssssssssssssssssssssssssss.... *carries on hissing* *continues to hiss* *doesn't stop hissing. ![]() Opened the res cap, to be met with the sight of lots of steam...and not much water. Thankfully I went to the nearest shop and bought a 2.5 litre bottle of Evian water. Returned to the car and topped it up, then got home without any major issues. Parked up at mine and instantly filled the res tank full, started the engine and continued to bleed the system. Water level in the tank continued to drop. I looked into the engine bay, and saw a constant long dripping of water, from between the exhaust manifold and the cat ![]() Have I actually got a knackered HG this time? Water is clearly escaping in floods, and there's also a lot of steam that comes out of the exhaust when I rev the car. On the plus side... I had hot air coming out of the vents in the car whilst there was water in the system. ![]() Last edited by Ucof; 26-03-2010 at 19:03. |
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![]() | Re: Engine running hot and lack of hot air in cabin I think I'll be getting the compression tester out tomorrow if it has stopped raining... Just found these useful links: https://www.fiatforum.com/uno-guides...-cold-uno.html - in the Uno guides section. http://www.aa1car.com/library/coolant_leaks.htm Last edited by Ucof; 26-03-2010 at 19:36. |
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Join Date: Oct 2004 Location: N.W.
Posts: 2,846 Thanks: 84 Trader Rating: 9 ![]() | Re: Engine running hot and lack of hot air in cabin Never ever take the rad cap off when the car is over heating. no car is woth it!! ![]() ![]() ![]() ![]() ![]() ![]() your lucky that there was not much in it, of you'd be in hospital with serious burns, and lifetime scarrs cos it sprays out with force and is verry hot. I have seen the results when I was a kid - nasty!! Sounds like the engine may have got so hot that the head has warped (bent) if you have been into the red. compression tester won't tell you if the head gasket has gone if it ain't gone into the bore (leaking engine gas) out ![]() you want to try and trace the water leak... Oh you found it in guides. it may be one of the pipes at the back that has split, causing the water to fall out ![]() Think I still have a 999cc head (can't remember if I kept one) incase your is bananna shaped now. You need to find the cause of your problem which may have resulted in HG failure / split pipe (faulty fan switch?? bad water pump) before you fix the symtoms, or it will just go again ![]()
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![]() | Re: Engine running hot and lack of hot air in cabin Cheers for that Louie. Regarding the rad cap, I had already let all the pressure out via the bleed screw so the system was not under pressure. Or is this not the issue? I'll be under the car tomorrow then trying to trace this leak. What happens if it is just leaking into the engine and coming out of the exhaust pipework? I know the fan has worked since I got the car though... it could just be bad luck that it has failed now. |
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Join Date: Oct 2004 Location: N.W.
Posts: 2,846 Thanks: 84 Trader Rating: 9 ![]() | Re: Engine running hot and lack of hot air in cabin Just cos the fan wasn't on today don’t mean it's not functioning as it should... Like the in car heater, there needs to be enough water in the system to circulate, and it needs to be circulating for both to work work. But if no water in, or water not circulating neither will work. The rad fan switch is at the bottom of the rad where you said was cold today, so the switch will not have seen high enough temp to cut in ![]() So the fan switch rad fan may or may not be working, but either could have caused a HG failure ![]() But the HG may have simply failed due to system neglect and caused the water to be lost and the other symptoms follow.
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![]() | Re: Engine running hot and lack of hot air in cabin ![]() Louie has already covered most, if not all, of your current issues. You have a choice of replacing the head gasket or replacing the engine. Considering the amount of work and costs required for replacing the head gasket, it might be an idea to consider an engine swap for a known good engine. You could even upgrade to 1242 status while you're at it! Personally I'd go for the engine swap as it's likely to be cheaper than a head gasket change and associated parts/ machining, though obviously you'd need to remove the engine and drive-train to do this. Punto 8v 1242 engines can be picked up for not much at all these days, figures like £60 for a lowish mileage lump are not unusual. Swap a few pulleys/ mounts over and there you go, one 1242 Uno ![]() |
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