1999 Nissan Altima Weak Heat After Hose Job

1999 ALL OTHER MAKES ALL OTHER MODELS
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ROMESNOW101
  • MEMBER
  • 1 POST
My car has 153,000 miles on it very well kept up, the dealer told me to replace the radiator hoses and thermostat, my car worked fine and blew great heat into the car before replacing, (i had no problems), I rplaced the thermostat and hoses and now the cars engine does not get hot and blows ok heat while reving the engine but then cool as soon as your not on the gas. What is the problem, I tryed 2 different thermostats neither working so its not stuck open....HELP?
Jan 31, 2007 at 4:40 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
[quote:45db8ea68b="romesnow101"]My car has 153,000 miles on it very well kept up, the dealer told me to replace the radiator hoses and thermostat, my car worked fine and blew great heat into the car before replacing, (i had no problems), I rplaced the thermostat and hoses and now the cars engine does not get hot and blows ok heat while reving the engine but then cool as soon as your not on the gas. What is the problem, I tryed 2 different thermostats neither working so its not stuck open....HELP?[/quote:45db8ea68b]

Why did the dealer told you to replace the Stat and Hose-for what reason?is it because you're not warm enough.Hmmm....

Take the thermostat back out and check whether you're getting warmer.No difference-check the heater contol valve-partial clogged heater core.

Replaced Thermostats are they correct temperature
Try reflushing the radiator again
Jan 31, 2007 at 6:12 PM
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Suggested Repair

Confirm the replacement thermostats are the correct temperature rating. Remove the thermostat and compare warm-up; if unchanged, inspect the heater control valve and a partially clogged heater core, then flush the radiator again.

Conversation Summary

The owner of a well-maintained 1999 Nissan Altima with 153,000 miles replaced the radiator hoses and thermostat on dealer advice. The engine previously warmed normally and produced strong cabin heat, but afterward it does not get hot and heat is only adequate while revving, then cools off throttle. Two thermostats were tried. The expert asks why the parts were replaced and suggests confirming the thermostat temperature rating, testing with the thermostat removed, checking the heater control valve and a partially clogged heater core, and flushing the radiator again.

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