Skip the auto shop - Our mechanics make house calls

Q: Suzuki Alto SB-308, model 1993. Thermostat Valve behaviour

asked by on

I recently installed thermostat valve part number 17600-85811 rated 82C. I noticed valve opening when temp gauge reaches 10% and fan comes on at 40% on its way from C to H. Issue is that, while continuous driving at highway speeds the temperature gauge again comes back to 10% and stays around there until speed is slowed down or stopped then it starts rises up to 45% and again fan comes on. If I continue to drive at high speed the fan never comes on and needle remain near to C while in optimum situation it should show almost constant temperature near to half way to H.
My car has a manual transmission.

A: It sounds like the thermostat you have may ...

It sounds like the thermostat you have may be the wrong temperature rating. Try to use the 91 degree thermostat. That should keep your temperature closer to the midpoint on the gauge. The air rising across the radiator while driving is cooling the engine coolant very well, but by having the 82c thermostat, it will always try to cool to that temperature before closing and allowing the motor to heat up again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Silhouette

Many different parts can cause the vehicle to overheat. The most common would be the thermostat, radiator, water pump, air in the coolant, or a coolant leak. When a vehicle overheats at idle the usual suspect is the radiator fans....

Q: Hard clug noise and brakes locked; car barely moved

First thing to have checked are the problem codes that are causing the Check Engine light to be illuminated. This will direct you to the relevant problems that may have caused the stalling issue. Stalling issues can involve vacuum leaks,...

Q: My temperature is reading cold, almost to the bottom. Is this normal?

Hey there. The cold reading could mean that your thermostat is stuck open or the cooling fan is running all of the time. It could also mean a problem with the sender or gauge. Have a mechanic diagnose the cause...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.