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1985 Honda Prelude No heat

Tiny
BPUIDA
  • MEMBER
  • 1985 HONDA PRELUDE
  • 4 CYL
  • FWD
  • MANUAL
  • 200,000 MILES
My son just bought a 1985 Honda Prelude it doesn't warm up on a cold morning. The radiator is full. The engine temperature doesn't go up very much even after driving for awhile. I suspect it is the thermostat. What do you think?
Saturday, January 9th, 2010 AT 9:19 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Hi BPuida,

Yes, most probably the thermostat has been removed or is stuck in the open position.

When engine is cold, remove the radiator cap and start the engine. Note the coolant inside the radiator neck. If the coolant moves continously, the above is true. If the thermostat is good, the coolant should be stagnant for a few minutes before it starts moving.
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Monday, January 11th, 2010 AT 11:44 AM

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