Heater Unit - Noise From the Water Flow
89mazda10Category 15
Applicable Model/s 1986-87 RX-7
Subject WATER FLOW NOISE FROM HEATER
Bulletin No. 086/89
Issued 12/29/89
Revised
DESCRIPTION
There is a possibility that noise can result from the water flow inside the heater unit. This noise can occur when the engine rotates at 4,000 to 5,000 RPM with the temperature control lever approximately in the medium position.
Should the customer complain about such a noise, a service part is available to repair this problem. Use the procedures listed in this bulletin to eliminate the noise.
REPAIR PROCEDURE
Install an orifice in the (return side) heater hose as follows:
1 Push the orifice into place so that it
is seated evenly in the hose. Do not install the orifice in a slanting position.
2. Push the hose down 30 mm evenly on the fitting next to lower radiator hose.
3. Tighten the hose clamp until the distance (A) becomes 1-5 mm (see illustration).
PARTS INFORMATION
NOTE: This is a service part only. It is not installed on production vehicles.
PART NUMBER DESCRIPTION
FBY1 61 E09 Orifice
WARRANTY INFORMATION
Customer Comment Code: 80
Damage Code: 9G
Part No. of Main Cause: FBY1 61 E09
Operation No: U0401X-R-X
Labor Hour: 0.3 Hr