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1993 Toyota Tercel insufficient heat

Tiny
WCT2009
  • MEMBER
  • 1993 TOYOTA TERCEL
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Car is in great condition. Engine rebuilt 12000 mi ago.
new water pump, radiator, thermostat, radiator cap,
changed heater core and readjusted all controls. Temperature gauge never reaches half way. Cooling fan works ok. Heat will turn cold while driving. Have also tried blocking radiator with cardboard. I live in dc, so it doesn't get extremely cold here. Please help I also noticed that I can remove radiator cap at any time. Not enough pressure, but have not had system pressure tested.
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Tuesday, January 20th, 2009 AT 12:38 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine heat or cabin heat? Could be caused by thermostat stuck open recheck it-
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Tuesday, January 20th, 2009 AT 1:45 PM
Tiny
WCT2009
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  • 10 POSTS
Thermostat was replaced 2 days ago to no avail.
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Tuesday, January 20th, 2009 AT 5:09 PM
Tiny
WCT2009
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Tuesday, January 20th, 2009 AT 5:45 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the heater control valve
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Tuesday, January 20th, 2009 AT 7:22 PM
Tiny
WCT2009
  • MEMBER
  • 10 POSTS
This particular model has no heater control valve to direct the flow of water through the heater core. I believe water flows through the heater core at all times and heat is directed to the passenger compartment by opening a heater door using the heat control lever on the dash. This lever was re-adjusted after the heater core was replaced.
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Tuesday, January 20th, 2009 AT 9:21 PM
Tiny
WCT2009
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Tuesday, January 20th, 2009 AT 9:54 PM
Tiny
WCT2009
  • MEMBER
  • 10 POSTS
Problem solved!
The tip was the fact that the radiator would not build up pressure. After the radiator tested ok, the only other suspects were the radiator cap and the thermostat. I went to the dealer for a replacement thermostat, and learned that the car calls for a 2 stage thermostat in a particular heat range. The aftermarket thermostat was not sufficiently rated.
Thanks anyway for the help, guys.

I tried to post a donation, but your protocol does not allow for DC residents in the list of states.
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Wednesday, January 21st, 2009 AT 1:13 PM

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