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What blows cold air? The heater? Sounds like a radiator problem. I'd have someone flush the cooling system if it has not already been done. Could also be a bad or going bad Coolant pump, unless it has been replaced. It might be smart to do both at the same time. If the coolant pump is bad, it could explain no circulation of hot coolant through your heater coil.
Did you replace the thermostat? Doesn't sound like it. There is no anti freeze left in the core, so you have no heat. Anything more might be another head gasket. Sorry.
I would start at thermostat. It could be it is sticking and taking a long time to open. If it isn't a bad stat then I'd say there is a good chance it could be a head issue. either the gasket or the head itself. Have you overheated it lately? Also make sure your cooling fan is running after thermostat opens up. If you want to check the heads have a compression test done to make sure. Hope this helps.
Sounds like you may have a head gasket that has gone bad. with the engine cold remove the radiator cap and start the engine. If there is a constant peculation of small bubble coming out of the radiator and the smell like gas or exhaust you have a bad head gasket.
when water temperature rises it's an indication off a head gasket busy blowing or already blown.this would blow water into the oil. make sure you don't have the engine overheating. this could cause a number off other headaches. have the car towed to a good mechanic. do not use the agents because they will make you hate porsche. I take take it it has the flat six engine and will use two head gaskets on each side. I would order this and buy it myself. you will save money. give it to the mechanic who only does the labour. people think that when you drive a porsche there is money to be wasted. take care
first check to see that you coolant level is full, check it after the engine has cooled down,so there is no pressure in the system. otherwise you possibly have a head gasket in the early stage of failure
Just finished fixing my daughters 1999 taurus heat. It would blow warm only when running down the road. At idle it blew cold. I started with replacing thermostat, and water pump because they are the easier fix. Still did not help. Then I replaced the heater core. A daunting job but not that hard to move the dash slighly out of the way to replace. There is a good write up at tarusclub.com. After that, heat was better but at idle, it would still blow cool sometimes. Researched and found answer. Park car on the steepest hill you can find with front of car up. Start car and take off reservoir cap. Let car warm up and keep rpms about 1500. After a while the fluid will come running out of the car and all over the place but it will bring air bubbles with it. Reduce rpm, add more fluid and repeat about 3 times. It will make a mess but after that, the heater works perfectly. We get heat long before the temp gage indicates any and it never blows cold unless you lower the temp.
I DON'T IT'S THE THERMOSTAT, BECAUSE I HAD THE SAME PROBLEM, COME TO FIND OUT IT WAS MY BYPASS HOSE BEHIND THE ENGINE THAT WAS LICKING THE COOLANT. CHECK COOLANT RESEVOIR.
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