Question about Toyota Celica

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2000 celica gts, heater is blowing cold air 90% of the time. dash is telling me the engine is overheating, than goes back to normal 2sec later. changed the thermostat still no change.

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It sounds like you need to do a real good back flush to the entire system . Its likely that to much sediment has built up in the radiator and the heater core and globs of it are moveing around in side the cooling system clogging some times and other times it will work .I would flush it first twice and replace the antifreeze after that and make sure you do the core aswell remove the hoses from it and force water from side to side catch the water in a bucket move all water valves to make sure free and draining the block would also be a good idea there are plugs on each side of the lower block to do this . I t sounds like you can save the system at this point but you should change the antifreeze every 5 years as a rule and things like this won't happen

Posted on Mar 15, 2011

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A leaking cylinder head gasket can cause the symptoms you have described.I would have it tested by your local garage. This is a simple chemical test that detects exhaust gas in the cooling system. This should cost under 30.00

Posted on Mar 15, 2011

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Flush the waterpump

Posted on Mar 15, 2011

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They are symptoms of a failed head gasket. see if the coolant smells a bit fume polluted.

Posted on Mar 15, 2011

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The heater core and evaporator are in a box together underneath the center of the dashboard against the firewall. My service manual seems to indicate that they both must come out at the same time to access either. Presuming this is correct, here we go.
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1 Answer

Heater blows cold


Does temp gauge on dash show normal temp? If so problem is with the controls. If sytem cycles through normal controls IE, defroster, floor,bi-level and redirects air properly check to make sure door control is functional for heater core. If door is not opening then you will never get hot air

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Heater blowing hot then suddenly blows cold and engine overheats. Intermittent problem. After engine cooled may overheat again with heaters blowing cold then suddenly heater blows hot again and...


I have written a tip on this.
You may have a couple of problems. I would first replace the thermostat, and make sure you have the proper coolant(ant-freeze) level.
Please let me know how it goes and if you need further help I am here.

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If the engine temprature does not reach the normal level as it used to, it may be the coolant thermostat.

Iif it does, it could be air diverter gates not working properly, cold air blowing at a a light could point to that. The diverter gates are located under the dash.

It also coul be the valuve that controls the water to the heater core, but unlikely cause of the cold air at a light.

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sounds like the thermostat stickng as when engine gets cold the choke will start workin again, causing the over reving or your electric fan is on all the time "over cooling" the engine

Dec 22, 2009 | 1988 Volkswagen Golf

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Toyota Celica gts 2000 blowing cold air when heater is on.


nothing try back flushing heater core, they clog up due to litle water preasure,you might want to flush cooling system if you already havent, hope this hleps.

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4 Answers

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