There are other things to test before we have the engine spread all over the yard. Cooling fan operation. Yes the thermostat hot air in heater just means hot water. start with a cold engine then start and run at a high idle if heats quickly upper radiator hose hot lower cold good but reverse no flow. remove and test thermostat (not replace) put on stove boil water and watch it open once center piece is moving check with thermometer it should agree with stamp number on thermostat. if good check for slipping fan belt. check for air restrictions on radiator and water flow.
Is the fan working? If the fan is working and trying to cool, remove radiator cap when cold START UP and look inside radiator for water movement when gauge reads normal temp. If water is not circulating replace water pump. Thermostats fail open and will not let motor get up to temperature. If overheated and stuck open it will also need to be replaced.
SOURCE: 1996 ford contour gets hot , no hot heater or temp guage movement
Is your temperature gauge working now? That is of more concern then your heater as you wouldnt know if your engine was overheating until its too late. Your heater core could be clogged, they get clogged quite easily. You can flush them or replace. The part is inexpensive but on some models you have to take out dash to replace them, but on other models it only takes about 30 mins and a few bolts.
SOURCE: Intermittant hot/cold air from heater
Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.
SOURCE: we have an audi a4 2.6cc , the heater only blows
sounds like the thermostat is not functioning correctly? either that or not in at all? thus making the water which would normally warm up quickly, warm up extremely slowly and on really cold days not at all? with a 2.6 engine your car shoudl warm up in record time?
SOURCE: OVER HEATING
In the fan circuit...You have a temp switch screwed on the radiator, a fuze and a relay in the fuze box plus a fan. Swap the relay with another relay, replace the fuze. The other fan should come on when the a/c is turned on. If you fix the fans and it still overheats, you may have a BLOWN HEAD GASKET. ALSO ARE YOU BLEEDING THE AIR FROM THE SYSTEM? DO YOU SMELL EXHAUST IN THE COOLANT?
SOURCE: 2001 Mitsubishi Montero Limited. 122k miles.
2003 Mitsubishi Montero Limited. 97k miles. Temp gauge is erratic when actual temp is normal. How do I fix this?
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