Medic-one Posted May 8, 2022 Report Share Posted May 8, 2022 Went for an early morning blast with some friends to a local car show, and had the heater on with the vents pointing towards my hands, when suddenly the air stopped being hot, and was just luke warm. Tried it again at the end of the morning on the way home, and it's no longer blowing out hot air like it used to, apart from when you turn it up all the way to HIGH, then it is hot, but any temp below that, which previously was still rather hot, is now just luke warm. Am I right in saying this could be a waterpump issue ? and if so is that something a garage would be able to check easily ? Quote Link to comment Share on other sites More sharing options...
bally4563 Posted May 9, 2022 Report Share Posted May 9, 2022 I would favour the thermostat 1 Quote Link to comment Share on other sites More sharing options...
Philc Posted May 9, 2022 Report Share Posted May 9, 2022 I’d recommend getting an elm327 bluetooth obd adapter for less than a fiver from ebay, and the free torque app, you can get live coolant temp readings, might help diagnosis with your coolant issues. 1 Quote Link to comment Share on other sites More sharing options...
And.rs1800 Posted May 9, 2022 Report Share Posted May 9, 2022 On 5/8/2022 at 6:22 PM, Medic-one said: Went for an early morning blast with some friends to a local car show, and had the heater on with the vents pointing towards my hands, when suddenly the air stopped being hot, and was just luke warm. Tried it again at the end of the morning on the way home, and it's no longer blowing out hot air like it used to, apart from when you turn it up all the way to HIGH, then it is hot, but any temp below that, which previously was still rather hot, is now just luke warm. Am I right in saying this could be a waterpump issue ? and if so is that something a garage would be able to check easily ? I think if it was a water pump issue it would be HOT all the time surety Quote Link to comment Share on other sites More sharing options...
YorkshireBoxster Posted May 9, 2022 Report Share Posted May 9, 2022 Have you checked your coolant level? If it's low it could struggle to blow any hot air through. Your coolant guage may indicate warmer than normal if its low on coolant too. I had a thermostat housing fail on me once in a previous car (not porsche) and the heater air gradually blew cooler and the guage moved closer to red. Quote Link to comment Share on other sites More sharing options...
½cwt Posted May 9, 2022 Report Share Posted May 9, 2022 Cabin temp sensor? Only an internet diagnosis suggestion... Quote Link to comment Share on other sites More sharing options...
Medic-one Posted May 12, 2022 Author Report Share Posted May 12, 2022 On 5/9/2022 at 5:29 PM, Philc said: I’d recommend getting an elm327 bluetooth obd adapter for less than a fiver from ebay, and the free torque app, you can get live coolant temp readings, might help diagnosis with your coolant issues. Good idea, just ordered one 👍 Quote Link to comment Share on other sites More sharing options...
Guy Wilkinson Posted May 17, 2022 Report Share Posted May 17, 2022 Deffo the cabin temp sensor. Just replaced mine with identical symptoms Quote Link to comment Share on other sites More sharing options...
Paul P Posted May 17, 2022 Report Share Posted May 17, 2022 8 minutes ago, Guy Wilkinson said: Deffo the cabin temp sensor. Just replaced mine with identical symptoms Trouble is the cabin temp sensor on the 987 is part of a hvac control unit. there’s no replacement sensor ( nor the little fan that pulls the air over it ) I agree that’s a symptom but you would want proper diagnostics before committing to a replacement for that unit ….. Considering the car had recently had other cooling system challenges then I think there might be more going on. Quote Link to comment Share on other sites More sharing options...
Guy Wilkinson Posted May 17, 2022 Report Share Posted May 17, 2022 Gotcha , soz, landed in 987 forum instead of the 986 ! Quote Link to comment Share on other sites More sharing options...
gillbe Posted May 18, 2022 Report Share Posted May 18, 2022 After the run with no heat from blower, are the rubber pipes to the radiators in front wheel wells hot? They should be, that at least would narrow the problem area down Quote Link to comment Share on other sites More sharing options...
Medic-one Posted May 18, 2022 Author Report Share Posted May 18, 2022 3 hours ago, gillbe said: After the run with no heat from blower, are the rubber pipes to the radiators in front wheel wells hot? They should be, that at least would narrow the problem area down I've not checked that, but it's going in for some investigations on Monday so hopefully will know more then. Quote Link to comment Share on other sites More sharing options...
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