Permanent oil cooler vs thermostat

[Lt86]

(03-24-2015 12:50 AM)Deuce Cam Wrote:  Is your car equipped with air conditioning?

If not you can easily remove the glove box, and then disconnect the tube leading to the heater core box (shown below, mounting screws circled in red):

At that point you should be able to see the heater core and blend door. Move the temperature knob on the hvac panel and see if the flaps are allowing air to pass through the core. You can alter the range of adjustment by moving where the sheath on the black cable is clipped in place on the heater core housing.

I would also check the hvac panel to make sure it didn't break where the cables attach. It's a somewhat common proplem due to the poor design.

If that doesn't fix the problem you might have a clogged heater core. This is all assuming your thermostat is operating correctly.

Thanks for the tip . I don't have AC so I had the tube off in a minute. It seems the flaps are working properly. The bottom on closes entirely, the top one stays open for about half a cm unless I really pull the heater to max. heat. It might need some adjusting between the upper and bottom flap.

Anyways, I did see that the fabric is in really poor condition (no wonder after 30 years). I might pull the HVAC unit out to replace it with new cloth. BUT I don't think this should cause my problem of heaving nearly no heat.

Overview


Top flap up



Top flap down.


I already flushed my heatercore so I doubt it is clogged. Water runs through it nicely and I flushed it untill no more debri came out.




How does the thermostat affect the heat from flowing? Didn't really check the routing and I don't know it by hard at the moment. Is warm water only going to flow once the thermostat opens op?

I do have another problem with my coolant gauge. After 35 seconds idling on a cold morning (sometimes even less) the meter goes straight to the middle part of the gauge and stays there. I find this very hard to believe because there is no way the coolant could be warm so fast. Any solution or possible cause for this?

Thanks again for the help