![]() ![]() While some people mix water with the coolant, it’s important that too much doesn’t get into the system. If there is too much water in the cooling system, the temperature gauge can act strangely. RELATED: 5 Symptoms of a Bad Car Thermostat 2. You may also have trouble getting heat out of the HVAC system. If the thermostat is stuck open, engine temperatures are going to drop below normal. When the thermostat is stuck closed, the coolant isn’t able to flow, meaning the engine won’t be able to cool off. Once it goes bad, it will no longer act this way. If it starts to fail, it can act erratically, causing the gauge to jump up and down. The thermostat is used to regulate the temperature of the coolant. Here is a more detailed list of the reasons why your car temperature gauge goes up and down: 1. On the other hand, it could be due to a defective coolant temp sensor or a bad temperature gauge It’s also possible that there is air in the cooling system. The temperature gauge can fluctuate up and down because of a bad thermostat or a lack of coolant. ''I just wanted to let everyone know that my hot start problem has now been sorted.Sources Reasons Why A Car Temperature Gauge Goes Up And Down Which does it suggest something else not related to the electrics/ sensors, more of a mechanical thing? but how the temp gauge on dash & hot start prob are related i dont know.įuel pump might be failing and there is a low pressure Got the vag com laptop out - no fault codes at all, (which is good that the temp sensor code has gone) but the hot start problem persists, as does the gauge on dash not hitting 90 Went back to car to drive home- then thats when it happened- the hot start prob! the worst its ever been, turning over fine but no fire up (tried a lil bit of this, a little bit of that, a little bit of throttle, a lot of throttle! lol, then 'just about' fired up, yesus, poor car, just ****** work! lol, ![]() ![]() Turned car off, had a think / research with a cuppa tea I was now hoping the dash gauge would creep straight up to 90' but it never went past 72ish ' :-( The new one as suggested up there in the thread ^ is much more substantial than the euro cp item!, plugged it in with the new o ring seal, tightened up, put new anti freeze in, let it burp/ warm up with heater on etc, (when i took the car it was cold at start of journey- started fine- i actualy stoped at a shop on the way like an idiot but wierdly on return to the car it started ok, just felt a bit weaker to fire) - carried on to mates yard,Ĭar cooled down for 2ish hours while we done other stuff elsewhere, then we got to fitting new stat, So i recieved the Thermostat in the post yesterday, took the car to a friends yard to change the old/ new thermostat over (quite simple on a 98 agu compared to other years/ codes) , Would the maf be anything to do with it? even though the fault code read 'temp sensor' ? Only other thing i have seen is possibly its to do with the lambda sensor on exhaust (if i have one on the 98 agu)Īny other suggestions to make the dash gauge sit at 90' and the car start (fire) from hot/ warm ? I am going to buy a new square temp sensor (and the other d shape one that sit near eachother in the agu), a new thermostat with o ring seal, new antifreeze & change that fresh 50/50 mix, ![]() I have the bolt down agu coil packs, the spark plugs look fine, i have seen on other forums & posts people say crank position sensor! ? but surely that wouldnt be it, Surely this cant be the thermostat knackard allready! ? I shortly after replaced thermostat with a euro car parts item (only 3 months ago), this seemed to do the trick, the gauge on dash worked as is should and reached 90' no probs (so im guessing the temp sensor was ok & just the thermostat that needed replacing) i have been driving happy for 2 months ish, untill now the 'hot start' thing has become much more of an issue, i looked at the dash gauge & just like before- it only just creeps up to 70' after a long while. I have replaced temp sensor with a gsf car parts item, made no difference when installed, fault code remains, wiring looks ok I checked for codes- shows temp sensor intermitent or not working well, just about after alot of persuation, Temp gauge on dash reads around just 60 / 70, possibly 80 in traffic, but this is after 20mins of driving! when it should way be at 90' by now,Īfter driving for say 45 mins, if i stop at a shop, get back in- it has a hot start issue (cranks over fine but does not want to fire). Its the age old coolant issue ive seen on so many old posts over the years- but had no success, so thought id ask here as to what to do/ check next (exept for scrap the car! lol) ![]()
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