When I have have my heat on in my 1994 suzuki sidekick, it'll get hot and slow itself down and get lukewarm and then cold. It'll shoot back up again as if I have it on high, when it's only on number one. I put a new thermostat in it.
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Hi, Sounds like the thermostat is sticking. A quick check is , after the engine has been run for a while feel the top and bottom hose of your radiator. the both should be hot. A sticking thermostat will not allow the hot coolant in the engine block to circulate through the radiator correctly. This is the first test for the issue described. Wayne
it is likely air flow if air is cold enought it can super cool a rad if you cover part of the rad partialy and the heat starts to come then slowely cover it more and more untill it hits the proper heat range
Buy a bottle of Techron Fuel injector cleaner. It's sold in many grocery stores and all auto parts stores. Pour the whole bottle into the gas tank when you can fill up. Drive the car and don't put more gas in until the car is almost empty. That should fix it
There is no tap inside - heat for the cabin is dictated by whether air flows over the heater core or bypasses it. The core could be blocked - just pull both hoses off it and stick a garden hose in it, preferably in the reverse direction to normal flow.
Found this on another website from someone else with the same problem. Hope this helps.
"This is the second year for lukewarm air coming from heater. Last year I changed t-stat and add new coolant ,also new radiator cap. It helped a little but not enough. Took it to a mech. and had it flushed ,that seemed to help alot but not as hot as it used to be."