Overheating

LPL111111

MEMBER
2005 HONDA CIVIC
2.7L
4 CYL
2WD
AUTOMATIC
160,000 MILES

- While driving, the interior car heat goes on and off.
- The temperature gauge goes up and down.
- As soon as the interior car heat comes back up, the radiator temperature gauge goes down.
- The overheating problem is mostly when idling.
Last year (twelve months ago), the same-same problem occurred and I changed the thermostat and it never did this problem again, until now.
- Now today, I changed the thermostat and still happening.
- Would there be a bubble of air, inside the system, preventing circulation or something else?
- Could I have put the thermostat incorrectly? Or upside down?
- if I put CLR calcium deposit remover in the radiator, would that maybe help circulation or damage metal integrity?

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon my name is Roy and I will assist.

Yes, it may have an air block.

Possible causes:

1. Low coolant level
2. Air in system
3. Bad thermostat
4. Restriction in the system

How long has it been since you replaced the thermostat?

Roy

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Tuesday, December 19th, 2017 AT 8:33 AM

LPL111111

MEMBER
2 POSTS

The same day as I posted my question.
Today, I added CLR to dilute possible calcium deposit, in the radiator, that might obstruct coolant flow.
I will have a drive today to see if it has improved temperature gauge readings. I also added Teflon oils, into the pan, to protect my engine in case of overheating.

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Tuesday, December 19th, 2017 AT 9:05 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Never use any additives in any systems. They contain all the needed protective's already.

The oil additive will not protect the engine at all. When you have a head gasket failure, the coolant in the oil attacks the babbitt material in the main and rod bearings. There is no product to prevent that.

Roy

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Tuesday, December 19th, 2017 AT 9:38 AM