Car gets hot with ac lever on cold?

[TURNA]

I going to say since 99% of replaced heater cores are aluminum that is NOT the problem.

UNLESS............

The valve goes to the drivers side port on the core which is the smaller tube

If your drivers side tube is the larger one you have a NON AC core in your AC equip car.

 

[MrSony]

I can confirm I have the right core.

 

[TURNA]

Who's left is the bigger hose on??

Looking at it left or sitting in the car left??

The bigger hose should be on the pass side of the car

 

[fleming442]

I don't see how that would make a difference. It's just a little radiator in a box with a shut off valve for A/C use.

 

[TURNA]

Its gotta flow the correct way


If not you overheat and have leaks like he did yesterday.

It can't be a coincidence

 

[fleming442]

I guess I've been lucky all these years! Never gave it a thought.

 

[pontiacgp]

Have you taken the rad cap off to see if the coolant is flowing in the rad?

 

[MrSony]

Larger hose is on the passenger side, smaller is closer to the drivers side with thr valve. Coolant is indeed flowing in/out of the radiator. All hoses are warm when car is upto temp. The section of hose from the core to the valve remains cool until heat is switched on.

 

[MrSony]

Would a faulty cap cause any of this? Its a cap I got from a junkyard, but it looked brand new. It was off a car with a 229 V6.

 

[fleming442]

A faulty cap won't hold the pressure, and coolant will boil out.