Guest iancar Posted February 28, 2006 Report Posted February 28, 2006 the short version of this saga, i have had the water pump and radiator replaced for an overhaeting problem, i am now in the process of having all three sensors replaced on the water pipes(the one's that tell the temp gauge how hot it is) the garage says that when tested the gauge is showing overheat and the water is showing normal with the thermometer in it. the last bit that is puzzling the garage is that after replacing the rad, the car heating is playing up, all fine till car warms up then heating goes cold. help has any one got any ideas it's costing me a fortune. Ian ;) Quote
marinabrid Posted March 1, 2006 Report Posted March 1, 2006 sounds like air lock to me , is the aux heater working ok ? Quote
dave_m Posted March 1, 2006 Report Posted March 1, 2006 just clarify a few things Does the car actually heat up then go cold if it does then... When the "Heating Goes Cold" what does the temp Gauge read. it could be one of the following Could be an air lock, could be a faulty water pump. (unlikely as you have a new one) could be a sticky thermostat provide us with some more details and we'll do our best to help Quote
marinabrid Posted March 2, 2006 Report Posted March 2, 2006 try leaving it ticking over with the rad cap off sometimes this cures it Quote
Guest iancar Posted March 3, 2006 Report Posted March 3, 2006 the temp gauge does read normal until a load is applied it then climbs quite quickly to red, this is the point where the haeting goes cold. the temp gauge dosn't move much at this point. the thermostat was replaced about 6 months ago for the initial overhaeting problem, is htis likely to have failed so early? further to this problem the garage has said that when he took off the heating pipe one of the hoses was bone dry? the garage is looking at the possability of the heater matrix being blocked, is this likely to happen? would it cause overhaeting and no car heating problems? cheers all for your input, look forward to the next installmentIan :( Quote
dave_m Posted March 4, 2006 Report Posted March 4, 2006 I would have thought if the matrix was blocked you would have no heat from the heaters at all. I think the heaters are going cold because the system is pressurising due to the overheating. when the car had the initial overheating problem did changing the thermostat solve the problem and it has now re-appeared? Quote
Guest iancar Posted March 5, 2006 Report Posted March 5, 2006 no replacing the thermostat never solved any of the problems accociated with the overheating, i have since had the rad, water pump and all 3 sensors replaced, as you can imagine it's all getting a bit expensive. cheers Ian Quote
Ivor_E_Tower Posted March 5, 2006 Report Posted March 5, 2006 If the garage found one of the hoses bone dry, that is why you have no heating. There is either a massive airlock or a blockage. Get a pressure test done first of all, and ask them to hold the pressure for a few minutes Quote
dave_m Posted March 5, 2006 Report Posted March 5, 2006 i would get the head gasket tested, check the coolant for exhaust gases as mine went and i experienced similar problems to yours. I ended up needing a new head Quote
Guest iancar Posted March 5, 2006 Report Posted March 5, 2006 i'm hoping it's the air lock, the garage is going to carry out a presure test of some kind to verify if the gasket is ok, i will post any results, fingers crossed it's not the same as dave_m plus i had the chemical test done about 6 months ago with no problems shown. this other garage however reckons that the chemical test is not very effective at showing a head fault on diesels, can anyone clarify this point? cheers for your time Ian Quote
dipsomaniac Posted March 5, 2006 Report Posted March 5, 2006 i would be questioning the garage on its initial diagnosis and why it has replaced so many parts. why was the water pump replaced? was it leaking? was it noisy?why replace the radiator?why replace the sensors? I am sure that they all weren't useless.have they tried flushing the system through?head gasket checks should have already been done? i hope it is not the head gasket although it can't be ruled out. i would have thought that a blockage is the likely cause as a hose shouldn't run dry. Quote
Guest iancar Posted March 6, 2006 Report Posted March 6, 2006 off to the garage tomorow for a chat i'll let you know ihow i get on. Ian Quote
Guest iancar Posted March 8, 2006 Report Posted March 8, 2006 all worst fears where proved today, a pressure test has shown the no1 piston is loosing pressure, i pressume this will be why it overheats, if the pressure goes into the water system, anyone got any ideas on what this might be going to cost me, this is presuming the head isn't cracked? ian :blink: Quote
dave_m Posted March 8, 2006 Report Posted March 8, 2006 sounds familiar and is exactly what happened to mine water pump failure, which caused overheating which has caused distortion of the head. It doesn't take much overheating to damage this type of cylinder head, apparently you cannot get these heads skimmed either cost me about Quote
Guest iancar Posted March 9, 2006 Report Posted March 9, 2006 just been to visit the poorly gal, the head is off and confirmed that the gasket had bridged the head in 2 places on the no1 piston, the head is off tomorrow for pressure testing, we will see what the outcome is. i'll post developements as they happen. Ian Quote
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