Outlet Temperature Too Low, With Maximum Heater Output

Cause/remedy:
a) Coolant level too low.

Correct coolant level.

b) Engine thermostat damaged.

Renew engine thermostat.







c) Circulating pump (10) not running.

Check circulating pump and renew. if required.

d) Heat exchanger contaminated or damaged.

Checkup:
Plug thermometer into defroster nozzles left and right. Start engine and run to operating temperature (min. 80 °C). Let engine run at approx. 2000/min for 5 minutes. Then read thermometer, indication should be > 55 °C.

Flush heat exchanger and renew, if required.

e) Dual valve damaged.

Renew dual valve.