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Hi, today i had the car running for about 30 mins or so while i cleaned it, then while i was waiting for the kids at school, i head this gurgling etc...looked at the temp gauge and it was at the top in the red!!!. Let the engine cool down for a while, and then drove home. Re filled the water up etc, but now the heater doesn't come on in the car??? Does this mean the thermostat has gone?? if so can i change it myself? or is could it be the relay..? Any help please---Merlin tec?
Edited by Dynamic Dave on 25/09/2009 at 19:51
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Why would you leave a car running for 30 minutes whilst you clean it. What temp does the car not run at. Is it stable at 88/90 or so or what. You clealry have overheated and got air in the system. Regards Peter
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It should have survived 30 minutes idling at today's temperatures, didn't the cooling fan(s) come on? If they didn't and you get the airlock/heater fixed, the temp sensor that should turn them on might be worth a check.
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You probably have an airlock in your heater, disconnect the return pipe and keep topping the water up until it runs free of air bubbles.
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its been left on for hours before and never over heated. Sat in traffic, fine. The temp normally sits dead center, and never ever goes higher. I ( silly i know ) undone the radiator cap, and near blew myself up--but it let out all the pressure-water and air. Left it a few hours, and then fillled the bottle up, then took the top off the radiator and filled it up, while the engine was running. The rad started bubbling and releasing the air. I thought everything was fine--except the heater never worked in the cock pit--thats why i thought that it could be the thermpstat etc...so does this point any one in the right direction-- would the air lock stop the heater from working?
I don't think the fans came on--so thats why it over heated--but if somethings gone then they won't? I've read a lot about the relay--just need to know which one to swap etc. I've got the manual somewhere--just have to find the CD.
Thanks for people replying
Bradleigh
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I am still at a loss why you keep leaving you car at idle when you wash it. That's irresponsible, burning fuel and creating unnecessary pollution. However when you released the cap ( Doooh ) was this when the engine was hot or cool. Just because you refilled it does not get the air lock out of the heater matrix as you have already been told. I it over heated at idel then the rad temp sensor and or relay has to be suspect if the fan did not cut in when the temp gauge went over 100 degrees. Regards Peter
Edited by Peter D on 26/09/2009 at 09:15
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the reason it was on was because i had my baby in the car and it was cold???? and leaving it idle for 30 odd minutes is not uncommon? Any way, id been driving it--quick jet wash, then drove a coupke of miles to the other kids school. so it had been running for 40 mins or so. Like i say, its never done it before. Would the air lock affect the heater in the cabin? I did have the manual on cd- but ive just been searching for half an hour--and no joy. I can check the relays, or heat sensor--if i could be pointed in the right direction.
and yes it was immensly hot when i undone the cap, as i just thought id release the heat--( yes i know it was stupid ), but i had the ignition on and the temp gauge went straight down to normal after that. Ill go out in a minute and try to release the airlock.
Bradleigh
Edited by brad1977 on 26/09/2009 at 09:38
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There is a new law introduced last January of 'excessive idling' and although not endorseable it does carry a fine. It is active in Scotland but I am not sure about the rest of the country. During your journey did the car overheat ?? I'm not sure how many time we are going to have to tell you that there is most probably and air lock in the heater matrix. This may have initially been caused by it overheating due to lack of electric fan. Only you know this and you need to tell us. Glad you did not scald yourself. Regards Peter
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Hi
Yes sound like the relay I have posted the location and part number for this on the forum (search under chrysler) Recheck the level when cold I bet it will still be low. Don't think it will be thermostat as it would get hot when driving.
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cool, ill check the relay. And it didn't get hot while driving, so if the relay had gone, i never noticed the fans coming on or not coming on, as its never happened.
After reading this forum, found the relay bit. Is it hot swappable? i mean old one out, new one straight in, and fire it up?
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Hot swappable is when it is powered up so you do not mean that. You can test the relay if you like or if the case is removeable than inspect the contacts to see igf they are burnt. However can you tell us what temperature the car got up to that may have caused this air lock. Regards Peter
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right to the top in the red
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When you were parked up or when. This is like getting blood out of a stone. Is this was when you were parked up then the relay or the senor is duff or of course the fan motor has died. Regards Peter
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Right-- got out my spanners and socket set--took off the air filter--found out that it was BLACK--thought id nip to halfords---dont sell them--so never go to halfords again, any way got all the plastic off, and saw the relay bolted to the body. Took it off and noticed it was wet? gave it a clean, wiped all crap off, screwed it all back up. Checked all the water levels, then fired her up, got rid of any air locks, left her idling to get hot ( remeber not to do this in scotland ) and after 15 mins temp was still normal, maybe a tad over the middle but fans never came on...So checked all the fuses, there ok. So as the fans never came on so i am thinking it IS the relay under the air filter--as if this is shagged then the fans won't come on. and the heater works in the cockpit now. So thanks for everyones input.
Merlin tec--any idea what one of these relays is gonna set me back? it don't matter 10, 50 100 quid, just wondered.
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Tell you for sure monday if you wish but between the 10 and 50 mark.
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Did you test, or do you know how to test a relay. Do you have a multimeter. Regards Peter
Edited by Peter D on 26/09/2009 at 17:26
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no i never tested it, but ill go get a new one on saturday. And let you know how i get on. Hope this fixes the problem!
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All changed , all fixed and woorks fine. Thanks everyone for your help.
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Hi, Having exact the same problem on a '99 2.5TD Voyager. If the internal heater works ie blowing hot (internal heater fans always work) then the temp drops down to normal but the internal heater blows cold more often that hot. Can't fint this relay, is it in the same place under the air filter?
Many thanks for advise in advance
Regards
David
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yes same place doesn't look like a relay as it's flat held on with 2 screws has 4 wires. it's low down need to remover the hole air box.
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Thank you for taking the time. I still cannot see it this morning. I have removed all air filter, lights etc. I can see the horns - but the only wires are going right into the fans on the rad. No where near the fuse or other relays either. I'm lost
Kind Regards
David
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I should add the rad fans do come on when it gets really really hot but still no heat in the van. Odd that the heat in the van affects the engin temp.
ie Heat in van = engine cool
Heat not working in van (blowing cold only) = engin overheating
Regards
David
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Update :: Ok all front plastic off exposing the front bumper now. Still cant find it :(
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sounds more like a water level problem. What engine do you have?
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Thanks for the reply, 2499cc TD 1999 model. I replaced the rad a couple of months ago due to the same problem which caused the pressure to escape from the weakest point the old rad I guess as it shot a massive hole in the bottom.
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so sorry just reread you did say 2.5. you have normal high and low fan relays in the fuse box under the bonnet. Your fault sounds more like a head problem, when the 2.5 get hot the heads can crack (you have 4 separate heads)
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Thank you so much for your help with this. So if the head is cracked on an S reg thats a write off isnt it? Just spent £300 on fitting the recore rad.
Is there an easy way to check the head?
Edited by DavidD on 02/01/2010 at 18:30
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I would get it checked out, I normally remove the coolant rail alone the side of the head and run it and check for bubbles the would pin point what head or head gasket that is leaking. You can get recon head for I think from about £150.
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Thanks so much for your advise. I will check that tomorrow. I did snap off a lug on the expantion tank and suck that back on with steel putty. It does not look like its leaking but I guess that could be it too if it was. The tanks was another £80 so I did not replace at the time.
I will let you know how I get on but thanks again.
Regards David, Warminster. Wilts
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