Question about 1987 Toyota Supra

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Rattling noise from heater core, even when heater is off

Hello,

My problem may be a bit hard to diagnose, so I will describe it as I first noticed it, what I did to try solve it and rule out possibilities.

A while back I began noticing a rattling noise coming from the dashboard. I thought it was a panel on the dash rattling but it wasn't. I poked my head under the floor and noticed it was coming from the heater core, most noticeably from behind the heater core near the firewall, however I cant hear the noise if I go outside into the engine bay.

I thought it was air bubbles rushing through the heater, so I did things like run the car on idle without the radiator cap to try get rid of the air bubbles, and park it on an incline, also I tried a sawn off coke bottle and fixed it to the radiator filler port, filled it up with water to try bleed air out of the system, but no bubbles came out.

I have noticed that I can hear the noise even when the heater is off, so I'm wondering why am I hearing it when the heater is off as when the heater is off there should be no water going through the heater core. The flap on the heater tap closes when the heater is turned off as I tried it and watched the little arm on the heater tap move when I shut down the heater. I can hear it only a little bit, hardly at all when the engine is cold, but when the engine warms up I can hear it a lot. It seems to come on at about 2000 RPM and increase as the revs rise.

Any Ideas, or Suggestions that I could try?

Thankyou.

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2 Answers

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  • Toyota Master
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When the engine is cold,check the coolant level.

Make sure it's on max.

===

A coolant system should be flush every two years.

===

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!

========

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.


=======
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.

Posted on Dec 03, 2009

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  • Toyota Master
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One of the heat transfer "fins" sounds like it has seperated from the tubes allowing it to rattle on you. Its a heat transfer deal that may cause a tink tink kind of sound as the heat makes it expand and cooling by way of air passing by it. You could replace it, or try to hold each fin and bend whatever one is making the noise.

Posted on Jul 16, 2009

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