When the engine is cold,check the coolant level.
Make sure it's on max.
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A coolant system should be flush every two years.
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If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.
The DIY method is to drive you car onto a ramp or a steep hill.
Iet the engine cool off and top off the coolant tank.
Set MAX heat + MAX fan
Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,
Check coolant level and top off coolant when the engine cools down.
A shop will charge $75+ for this but using an air operated excavate tool!
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A car with over 90K miles may experience linkage problem to the heater control valve.
The heater control valve (near the firewall) may be stick over time.
Open the hood and move the heater to max and min. Back and forth.
Clean and lube the linkage with WD-40 to free the heater control valve.
If it's a vacuum type heater control valve then cash for leaky vac. hoses.
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Move the fan switch back and forth to re-new the electrical conductors.
Pass a vacuum over the control panel to prevent dust build up behind the console.
This means the heator core needs to be replaced
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The temp gauge is half way up, and the coolant level is up to the required limit, and have the problem with the A/C heater actually and not the heat of the engine.
Yes,it blows hot sometimes and cold sometimes, after some time it wold heat a bit, even when it is at the max heat.
thanks for your help
1998 Toyota Corolla with Check engine light on, what could be happening?
The temperature of the engine determines the temperature of the heat admitted into the car. Try this: Drive the car, and when the heat is cool, observe the temperature gauge. If it is low at the same time, the coolant temperature may have dropped approx 40 degrees... 150 degress F would feel "cool" to you.
Normal operating temperature for your vehicle (temp gauge at 1/2) is 192 degrees F. Check that & get back to me. Thanks.
Where is the temperature gauge reading? If it is reading below half of the way up, your thermostat is sticking, and needs replaced. If the temp gauge is reading at one-half, look to see if the radiator is full of coolant. Let me know what you see on the two previous suggestions. Thanks.
is it that it blows some times and some times not or is it hot some times and cold others?
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